T Andromedae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 22m 23.14956s[2] |
| Declination | +26° 59′ 45.73676″[2] |
| Apparent magnitude (V) | 7.70 – 14.30 variable [3] |
| Characteristics | |
| Spectral type | M4e-M7.5e[3] |
| B−V color index | 2.63[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | −90±10[4] km/s |
| Proper motion (μ) | RA: −7.108[2] mas/yr Dec.: −3.352[2] mas/yr |
| Parallax (π) | 0.5913±0.0815 mas[2] |
| Distance | approx. 5,500 ly (approx. 1,700 pc) |
| Details | |
| Mass | 4.9[5] M☉ |
| Luminosity | 8.928[6] L☉ |
| Surface gravity (log g) | −0.51[5] cgs |
| Temperature | 3,235[5] K |
| Metallicity [Fe/H] | −0.39[5] dex |
| Other designations | |
| BD +26°43, HD 1795, SAO 73930 | |
| Database references | |
| SIMBAD | data |
T Andromedae (T And) is a variable star of the Mira type in the constellation Andromeda. Like all the stars of this kind, T And is a cool asymptotic giant branch star of spectral type M4e-M7.5e. Its brightness varies periodically, completing a cycle in 281 days. The peak luminosity, however, is different every variability cycle, but can reach a peak magnitude mv=7.70.[3]
Thomas David Anderson discovered that T Andromedae is a variable star, in 1894.[7] The next year, Edward Charles Pickering examined archival photographic plates to derive a light curve for the star, and calculated a period of 281 days.[8]
Measurements of the angular size variations of T And made with the Palomar Testbed Interferometer show no clear correlation with the star's brightness variations.[9][10]
References
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b c d General Catalogue of Variable Stars, s.v. T. And.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
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