TU Andromedae (TU And) is a variable star of the Mira type in the constellationAndromeda. 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]
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]
^ abcdTU 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.
^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.
^ abcHillen, 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: L6, arXiv:1201.5815, Bibcode:2012A&A...538L...6H, doi:10.1051/0004-6361/201118653.
