T Persei
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Perseus |
| Right ascension | 2h 19m 21.87884s[1] |
| Declination | +58° 57′ 40.3271″[1] |
| Apparent magnitude (V) | 8.34-9.70[2] |
| Characteristics | |
| Spectral type | M2Iab[3] |
| U−B color index | +2.62[4] |
| B−V color index | +2.33[4] |
| Variable type | SRc[2] |
| Astrometry | |
| Radial velocity (Rv) | −40.85[5] km/s |
| Proper motion (μ) | RA: 0.31[1] mas/yr Dec.: −2.42[1] mas/yr |
| Parallax (π) | 2.15 ± 1.24[1] mas |
| Distance | 2,345±55[6] pc |
| Absolute magnitude (MV) | −6.90±0.07[6] |
| Details[6] | |
| Mass | 9-12 M☉ |
| Radius | 510±20 R☉ |
| Luminosity | 45,700+4,400 −4,000 L☉ |
| Surface gravity (log g) | 0.06±0.05 cgs |
| Temperature | 3750±60 K |
| Metallicity [Fe/H] | −0.35 dex |
| Other designations | |
T Persei is a red supergiant located in the constellationPerseus. It varies in brightness between magnitudes 8.3 and 9.7 and is considered to be a member of the Double Cluster.
T Persei is a member of the Perseus OB1 association around the h and χ Persei open clusters, around 2 degrees north of the centre of the clusters. It is generally treated as an outlying member of the clusters.[7] It lies half a degree away from S Persei, another red supergiant Double Cluster member.
T Per is a semiregular variable star, whose brightness varies from magnitude 8.34 to 9.7 over a period of 2,430 days.[2] Unlike many red supergiants, it does not appear to have a long secondary period.[3][8]
The Washington Double Star Catalog lists T Persei as having a 9th magnitude companion 0.1 arc-seconds away. This is derived from Hipparcos measurements. However, no other sources report a companion.[9]
References
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