T Andromedae

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, and his variability occurs periodically, with the period calculated at 281 days. The peak luminosity, however, is different every variability cycle, but can reach a peak magnitude mv=7.70.[2]

T Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 22m 23.14956s[1]
Declination +26° 59′ 45.73676″[1]
Apparent magnitude (V) 7.70 – 14.30 variable [2]
Characteristics
Spectral type M4e-M7.5e[2]
B−V color index 2.63[3]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)-90 ± 10[3] km/s
Proper motion (μ) RA: -6.827 ± 0.226 [1] mas/yr
Dec.: -2.752 ± 0.185 [1] mas/yr
Parallax (π)0.8839 ± 0.1460[1] mas
Distanceapprox. 3,700 ly
(approx. 1,100 pc)
Details
Mass1.09[4] M☉
Other designations
BD +26° 43, HD 1795, SAO 73930.
Database references
SIMBADdata

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. General Catalogue of Variable Stars, s.v. T. And.
  3. "T And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 8, 2018.
  4. Wyatt, S. P.; Cahn, J. H. (December 1983), "Kinematics and ages of Mira variables in the greater solar neighborhood", Astrophysical Journal, 275: 225–239, Bibcode:1983ApJ...275..225W, doi:10.1086/161527.
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