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{{short description|B-type main sequence star in the constellation Aquarius}}
{{Starbox begin
{{Starbox begin}}
⚫
| name=Iota Aquarii
⚫
}}
{{Starbox image
{{Starbox image
| image =
| image =
{{Location mark
<div style="position: relative">[[File:Aquarius IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings]]
| image=Aquarius IAU.svg
<div style="position: absolute; left: 50.0%; top: 48.2%">[[File:Cercle rouge 100%.svg|12px]]</div>
| float=center | width=240 | position=right
</div>
| mark=Red circle.svg | mark_width=10 | mark_link=ι Aqr
| x%=52.5 | y%=51.5
}}
| caption = Location of ι Aquarii (circled)
| caption = Location of ι Aquarii (circled)
}}
}}
{{Starbox observe
{{Starbox observe
| epoch = J2000
| epoch = J2000
| ra = {{RA|22|06|26.22742}}<ref name=aaa474_2_653/>
| ra = {{RA|22|06|26.22742}}<ref name=aaa474_2_653/>
| dec = {{DEC|–13|52|10.8615}}<ref name=aaa474_2_653/>
| dec = {{DEC|–13|52|10.8615}}<ref name=aaa474_2_653/>
| appmag_v = 4.279<ref name=aass61_387/>
| appmag_v = 4.279<ref name=aass61_387/>
| constell = [[Aquarius (constellation)|Aquarius]]
| constell = [[Aquarius (constellation)|Aquarius]]
}}
}}
{{Starbox character
{{Starbox character
| class = B8&nbsp;V<ref name=houk1978/>
| class = B8&nbsp;V<ref name=houk1978/>
| b-v = –0.062<ref name=aass61_387/>
| b-v = –0.062<ref name=aass61_387/>
| u-b = –0.288<ref name=aass61_387/>
| u-b = –0.288<ref name=aass61_387/>
| variable =
| variable = constant<ref name=Lagrange_et_al_2009/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
Line 29: Line 31:
| p_error = 0.22
| p_error = 0.22
| parallax_footnote = <ref name=aaa474_2_653/>
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v =
| absmag_v = +0.64<ref name=Anderson2012/>
}}
}}
{{Starbox detail
{{Starbox detail
| mass =
| source = <ref name=Gullikson_et_al_2016/>
| component1 = A
| mass = {{val|3.20|0.20|0.16}}
| radius = 2.7<ref name=mnras189_601/>
| radius = 2.7<ref name=mnras189_601/>
| luminosity =
| luminosity = 74<ref name=Anderson2012/>
| temperature = {{nowrap|11,284 ± 284}}<ref name=mnras189_601/>
| temperature = {{val|11284|284|fmt=commas}}<ref name=mnras189_601/>
| metal_fe = {{nowrap|–0.08 ± 0.12}}<ref name=aaa525_A71/>
| metal_fe = {{val|−0.08|0.12}}<ref name=aaa525_A71/>
| gravity = {{nowrap|4.09 ± 0.08}}<ref name=aaa525_A71/>
| gravity = {{val|4.09|0.08}}<ref name=aaa525_A71/>
| age_myr = 30–60<ref name=aaa523_A73/>
| age_myr = {{val|124|37|62}}
| rotational_velocity = 135<ref name=apj573_1_359/>
| rotational_velocity = 135<ref name=apj573_1_359/>
| component2 = B
| mass2 = {{val|1.00|0.03}}
| temperature2 = {{val|5710|112|fmt=commas}}
| rotational_velocity2 = 20
| metal_fe2 = −0.5
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = 33&nbsp;Aquarii, [[Durchmusterung|BD]]–14&nbsp;6209, [[FK5]]&nbsp;828, [[Henry Draper Catalogue|HD]]&nbsp;209819, [[Hipparcos catalogue|HIP]]&nbsp;109139, [[Bright Star Catalogue|HR]]&nbsp;8418, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;164861.<ref name=SIMBAD/>
| names = {{odlist | B=ι Aqr | F=33&nbsp;Aquarii | BD=–14&nbsp;6209 | FK5=828 | HD=209819 | HIP=109139 | HR=8418 | SAO=164861 }}<ref name=SIMBAD/>
⚫
}}
{{Starbox reference
| Simbad = iot+Aqr
}}
}}
{{Starbox end}}
{{Starbox end}}
⚫
'''Iota Aquarii''' (ι Aqr, ι Aquarii) is the [[Bayer designation]] for a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. It is visible to the naked eye with an [[apparent magnitude]] of +4.279.<ref name=aass61_387/> based upon [[parallax]] measurements made during the [[Hipparcos]] mission, the distance to this star is around {{Convert|175|ly|pc|abbr=off|lk=on}}.<ref name=aass61_387/>


⚫
'''Iota Aquarii''', [[Latinisation of names|Latinised]] from ι Aquarii, is the [[Bayer designation]] for a [[binary star]]<ref name=Gullikson_et_al_2016/> system in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. It is visible to the naked eye with an [[apparent magnitude]] of +4.279.<ref name=aass61_387/> Based upon [[parallax]] measurements made during the ''[[Hipparcos]]'' mission, the distance to this star is around {{Convert|175|ly|pc|abbr=off|lk=on}}.<ref name=aass61_387/> The system is drifting closer to the [[Sun]] with a [[radial velocity]] of −10&nbsp;km/s.<ref name=scfs/>
The [[spectrum]] of this star fits a [[stellar classification]] of B8&nbsp;V,<ref name=houk1978/> showing that this is a [[B-type main sequence star]]. It has 2.7<ref name=mnras189_601/> times the radius of the Sun and is spinning rapidly with a [[projected rotational velocity]] of 135&nbsp;km/s.<ref name=apj573_1_359/> A 2010 infrared search for companions around this star was unsuccessful.<ref name=aaa523_A73/>

The binary nature of this system was reported in 2009 following a radial velocity survey using the [[HARPS]] instrument.<ref name=Lagrange_et_al_2009/> A 2010 infrared search for companions around this star was unsuccessful.<ref name=aaa523_A73/> The presence of a stellar companion was confirmed through direct spectral detection in 2016. The companion shows a significant velocity variation over a 77-day interval, suggesting a short [[orbital period]].<ref name=Gullikson_et_al_2016/>

The [[stellar spectrum|spectrum]] of the primary, component A, fits a [[stellar classification]] of B8&nbsp;V,<ref name=houk1978/> showing that this is a [[B-type main-sequence star]]. It is roughly 124<ref name=Gullikson_et_al_2016/>&nbsp;million years old and is spinning rapidly with a [[projected rotational velocity]] of 135&nbsp;km/s.<ref name=apj573_1_359/> The star has 3.2<ref name=Gullikson_et_al_2016/> times the [[mass of the Sun]] and 2.7<ref name=mnras189_601/> times the [[Sun's radius]]. It is radiating 74<ref name=Anderson2012/> times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of ~11,284&nbsp;km/s.<ref name=mnras189_601/> The secondary, component B, has a spectrum of a solar-mass star.<ref name=Gullikson_et_al_2016/> The system is a source for [[Astrophysical X-ray source|X-ray emission]].<ref name=Haakonsen_Rutledge_2009/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen | year=2007 | month=November | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}</ref>
<ref name=aaa474_2_653>{{citation
| first=F. | last=van Leeuwen |date=November 2007
| title=Validation of the new Hipparcos reduction
| journal=Astronomy and Astrophysics | postscript=.
| volume=474 | issue=2 | pages=653–664
| doi=10.1051/0004-6361:20078357 | arxiv=0708.1752
| bibcode=2007A&A...474..653V | s2cid=18759600 }}</ref>


<ref name=Anderson2012>{{citation
<ref name=aaa523_A73>{{citation | display-authors=1 | last1=Ehrenreich | first1=D. | last2=Lagrange | first2=A.-M. | last3=Montagnier | first3=G. | first4=Chauvin | first4=G. | last5=Galland | first5=F. | last6=Beuzit | first6=J.-L. | last7=Rameau | first7=J. | title=Deep infrared imaging of close companions to austral A- and F-type stars | journal=Astronomy and Astrophysics | volume=523 | page=A73 | month=November | year=2010 | doi=10.1051/0004-6361/201014763 | bibcode=2010A&A...523A..73E | postscript=. |arxiv = 1007.0002 }}</ref>
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>


<ref name=aaa523_A73>{{citation
⚫
<ref name=mnras189_601>{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 | month=November | year=1979 | bibcode=1979MNRAS.189..601U | postscript=. }}</ref>
| display-authors=1 | last1=Ehrenreich | first1=D.
| last2=Lagrange | first2=A.-M. | last3=Montagnier | first3=G.
| last4=Chauvin | first4=G. | last5=Galland | first5=F.
| last6=Beuzit | first6=J.-L. | last7=Rameau | first7=J.
| title=Deep infrared imaging of close companions to austral A- and F-type stars
| journal=Astronomy and Astrophysics | postscript=.
| volume=523 | page=A73 | date=November 2010
| doi=10.1051/0004-6361/201014763 | arxiv=1007.0002
| bibcode=2010A&A...523A..73E | s2cid=54913363 }}</ref>

⚫
<ref name=mnras189_601>{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=189 | pages=601–605 |date=November 1979 | issue=3 | bibcode=1979MNRAS.189..601U | postscript=. | doi=10.1093/mnras/189.3.601| doi-access=free }}</ref>


<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | year=1978 | bibcode=1988mcts.book.....H | postscript=. }}</ref>
<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | year=1978 | bibcode=1988mcts.book.....H | postscript=. }}</ref>


<ref name=scfs>{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | bibcode=1999VeARI..35....1W | postscript=. }}</ref>
<ref name=scfs>{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | journal=Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | volume=35 | page=1 | bibcode=1999VeARI..35....1W | postscript=. }}</ref>


<ref name=apj573_1_359>{{citation | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 | month=July | year=2002 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | postscript=. }}</ref>
<ref name=apj573_1_359>{{citation | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 |date=July 2002 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | postscript=. | doi-access=free }}</ref>


<ref name=aass61_387>{{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 | month=September | year=1985 | bibcode=1985A&AS...61..387K | postscript=. }}</ref>
<ref name=aass61_387>{{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 |date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}</ref>


<ref name=SIMBAD>{{citation | title=iot Aqr -- Star | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Iota+Aquarii | accessdate=2012-06-30 | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=* iot Aqr | access-date=2012-06-30 }}</ref>


<ref name=aaa525_A71>{{citation | display-authors=1 | last1=Wu | first1=Yue | last2=Singh | first2=H. P. | last3=Prugniel | first3=P. | last4=Gupta | first4=R. | last5=Koleva | first5=M. | title=Coudé-feed stellar spectral library - atmospheric parameters | journal=Astronomy and Astrophysics | volume=525 | page=A71 | month=January | year=2011 | doi=10.1051/0004-6361/201015014 | bibcode=2011A&A...525A..71W | postscript=. |arxiv = 1009.1491 }}</ref>
<ref name=aaa525_A71>{{citation | display-authors=1 | last1=Wu | first1=Yue | last2=Singh | first2=H. P. | last3=Prugniel | first3=P. | last4=Gupta | first4=R. | last5=Koleva | first5=M. | title=Coudé-feed stellar spectral library - atmospheric parameters | journal=Astronomy and Astrophysics | volume=525 | page=A71 |date=January 2011 | doi=10.1051/0004-6361/201015014 | bibcode=2011A&A...525A..71W | postscript=. |arxiv = 1009.1491 | s2cid=53480665 }}</ref>

<ref name=Gullikson_et_al_2016>{{citation
| title=The Close Companion Mass-ratio Distribution of Intermediate-mass Stars
| display-authors=1 | last1=Gullikson | first1=Kevin
| last2=Kraus | first2=Adam | last3=Dodson-Robinson | first3=Sarah
| journal=The Astronomical Journal | postscript=.
| volume=152 | issue=2 | id=40 | pages=13 | date=August 2016
| doi=10.3847/0004-6256/152/2/40 | s2cid=119179065
| bibcode=2016AJ....152...40G | arxiv=1604.06456 | doi-access=free }}
<br>Note: the observations were made on modified Julian dates 6447.91 and 6524.67, which are separated by 76.76&nbsp;days.</ref>

<ref name=Haakonsen_Rutledge_2009>{{citation
| title=XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources
| last1=Haakonsen | first1=Christian Bernt | last2=Rutledge | first2=Robert E.
| journal=The Astrophysical Journal Supplement
| volume=184 | issue=1 | pages=138–151 | date=September 2009
| doi=10.1088/0067-0049/184/1/138 | arxiv=0910.3229
| bibcode=2009ApJS..184..138H | s2cid=119267456 | postscript=. }}</ref>

<ref name=Lagrange_et_al_2009>{{citation
| title=Extrasolar planets and brown dwarfs around A-F type stars. VI. High precision RV survey of early type dwarfs with HARPS
| display-authors=1 | last1=Lagrange | first1=A. -M.
| last2=Desort | first2=M. | last3=Galland | first3=F.
| last4=Udry | first4=S. | last5=Mayor | first5=M.
| journal=Astronomy & Astrophysics
| date=2009 | volume=495 | issue=1 | pages=335–352
| arxiv=0809.4636 | bibcode=2009A&A...495..335L
| doi=10.1051/0004-6361:200810105 | s2cid=62894956 | postscript=. }}</ref>


}}
}}
Line 76: Line 142:


{{Stars of Aquarius}}
{{Stars of Aquarius}}
⚫
{{DEFAULTSORT:Iota Aquarii}}

<!-- Properties -->
⚫
[[Category:Henry Draper Catalogue objects]]
[[Category:B-type main-sequence stars]]
[[Category:Spectroscopic binaries]]
<!-- Other -->
[[Category:Aquarius (constellation)]]
[[Category:Bayer objects|Aquarii, Iota]]
[[Category:Bayer objects|Aquarii, Iota]]
[[Category:Flamsteed objects|Aquarii, 33]]
[[Category:Durchmusterung objects]]
[[Category:Aquarius (constellation)]]
[[Category:Flamsteed objects|Aquarii, 033]]
[[Category:B-type subgiants]]
[[Category:Henry Draper Catalogue objects|209819]]
[[Category:Hipparcos objects|109139]]

⚫
[[Category:Bright Star Catalogue objects|8418]]
[[ko:물병자리 요타]]

Latest revision as of 13:24, 26 November 2023

Iota Aquarii
Location of ι Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 06m 26.22742s[1]
Declination –13° 52′ 10.8615″[1]
Apparent magnitude (V) 4.279[2]
Characteristics
Spectral type B8 V[3]
U−B color index –0.288[2]
B−V color index –0.062[2]
Variable type constant[4]
Astrometry
Radial velocity (Rv)–10.0[5] km/s
Proper motion (μ) RA: +36.89[1] mas/yr
Dec.: –58.99[1] mas/yr
Parallax (π)18.62 ± 0.22 mas[1]
Distance175 ± 2 ly
(53.7 ± 0.6 pc)
Absolute magnitude (MV)+0.64[6]
Details[7]
A
Mass3.20+0.20
−0.16 M☉
Radius2.7[8] R☉
Luminosity74[6] L☉
Surface gravity (log g)4.09±0.08[9] cgs
Temperature11,284±284[8] K
Metallicity [Fe/H]−0.08±0.12[9] dex
Rotational velocity (v sin i)135[10] km/s
Age124+37
−62 Myr
B
Mass1.00±0.03 M☉
Temperature5,710±112 K
Metallicity [Fe/H]−0.5 dex
Rotational velocity (v sin i)20 km/s
Other designations
ι Aqr, 33 Aquarii, BD–14 6209, FK5 828, HD 209819, HIP 109139, HR 8418, SAO 164861[11]
Database references
SIMBADdata

Iota Aquarii, Latinised from ι Aquarii, is the Bayer designation for a binary star[7] system in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent magnitude of +4.279.[2] Based upon parallax measurements made during the Hipparcos mission, the distance to this star is around 175 light-years (54 parsecs).[2] The system is drifting closer to the Sun with a radial velocity of −10 km/s.[5]

The binary nature of this system was reported in 2009 following a radial velocity survey using the HARPS instrument.[4] A 2010 infrared search for companions around this star was unsuccessful.[12] The presence of a stellar companion was confirmed through direct spectral detection in 2016. The companion shows a significant velocity variation over a 77-day interval, suggesting a short orbital period.[7]

The spectrum of the primary, component A, fits a stellar classification of B8 V,[3] showing that this is a B-type main-sequence star. It is roughly 124[7] million years old and is spinning rapidly with a projected rotational velocity of 135 km/s.[10] The star has 3.2[7] times the mass of the Sun and 2.7[8] times the Sun's radius. It is radiating 74[6] times the luminosity of the Sun from its photosphere at an effective temperature of ~11,284 km/s.[8] The secondary, component B, has a spectrum of a solar-mass star.[7] The system is a source for X-ray emission.[13]

References

[edit]
  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d e Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K.
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. ^ a b Lagrange, A. -M.; et al. (2009), "Extrasolar planets and brown dwarfs around A-F type stars. VI. High precision RV survey of early type dwarfs with HARPS", Astronomy & Astrophysics, 495 (1): 335–352, arXiv:0809.4636, Bibcode:2009A&A...495..335L, doi:10.1051/0004-6361:200810105, S2CID 62894956.
  5. ^ a b Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  6. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  7. ^ a b c d e f Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
    Note: the observations were made on modified Julian dates 6447.91 and 6524.67, which are separated by 76.76 days.
  8. ^ a b c d Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
  9. ^ a b Wu, Yue; et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics, 525: A71, arXiv:1009.1491, Bibcode:2011A&A...525A..71W, doi:10.1051/0004-6361/201015014, S2CID 53480665.
  10. ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  11. ^ "* iot Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-30.
  12. ^ Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics, 523: A73, arXiv:1007.0002, Bibcode:2010A&A...523A..73E, doi:10.1051/0004-6361/201014763, S2CID 54913363.
  13. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
[edit]
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