TU Andromedae

TU Andromedae (TU And) is a variable star of the Mira type in the constellation Andromeda. Like all the stars of this kind, TU And is a cool asymptotic giant branch star. It has a spectral type M5e. The period is stable at 316.8 days. The peak brightness, however, is different in each cycle and reach a peak magnitude (mv) of 7.5.[2]

{{Starbox astrometry

TU Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  00h 32m 22.72764s[1]
Declination +26° 01′ 45.90759″[1]
Apparent magnitude (V) 7.5 – 13.5[2]
Characteristics
Spectral type M5e[2]
B−V color index 0.96[3]
Variable type Mira[2]
radial_v= prop_mo_ra= −6.877±0.206[1] -2.278|0.139}}[1] parallax= 1.5775 p_error= 0.1124 parallax_footnote = [1] absmag_v=

}}

Details
Mass1.1[4] M☉
Luminosity5,200 - 5,400[4] L☉
Other designations
HD 2890, HIP 2546, 2MASS J00322275+2601459
Database references
SIMBADdata

The modelled properties of TU Andromedae at maximum brightness are not in agreement with available models of Mira stars (which work for Mira itself). It's uncertain if the problem is in the measured parameters of the star or in imperfections of the models.[4]

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. TU And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2009-06-30.
  3. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  4. Hillen, M.; Verhoelst, T.; Degroote, P.; Acke, B.; van Winckel, H. (2012), "The dynamic atmospheres of Mira stars: comparing the CODEX models to PTI time series of TU Andromedae", Astronomy & Astrophysics, 538, Bibcode:2012A&A...538L...6H.
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