T Andromedae
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 7.70 – 14.30 variable [3] |
| Characteristics | |
| Spectral type | M4e-M7.5e[3] |
| B−V Template:Engvar | 2.63[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[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. Template:Rnd ly (approx. Template:Rnd pc) |
| Details | |
| Mass | 4.9[5] Template:Solar mass |
| Luminosity | 8.928[6] Template:Solar luminosity |
| Surface gravity (log g) | −0.51[5] cgs |
| Temperature | 3,235[5] K |
| Metallicity [Fe/H] | −0.39[5] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| BD +26°43, HD 1795, SAO 73930 | |
| Database references | |
| SIMBAD | data |
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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
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- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c d General Catalogue of Variable Stars, s.v. T. And.
- ↑ a b Template:Cite simbad
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Template:Cite Gaia DR2
- ↑ Script error: No such module "Citation/CS1".
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- ↑ Script error: No such module "citation/CS1".
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