T Andromedae

A visual band light curve for T Andromedae, plotted from AAVSO data[1]
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]
Distanceapprox. 5,500 ly
(approx. 1,700 pc)
Details
Mass4.9[5] M☉
Luminosity8.928[6] L☉
Surface gravity (log g)−0.51[5] cgs
Temperature3,235[5] K
Metallicity [Fe/H]−0.39[5] dex
Other designations
BD +26°43, HD 1795, SAO 73930
Database references
SIMBADdata

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

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 General Catalogue of Variable Stars, s.v. T. And.
  4. 1 2 "T And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 8, 2018.
  5. 1 2 3 4 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  6. ↑ 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. Gaia DR2 record for this source at VizieR.
  7. ↑ Espin, T. E.; Anderson, T. D. (January 1894). "New variable stars". Astronomy and Astro-Physics. 13: 63. Retrieved 23 February 2023.
  8. ↑ Pickering, E. C. (April 1895). "T Andromedae". Astrophysical Journal. 1: 305–308. Bibcode:1895ApJ.....1..305P. doi:10.1086/140056. Retrieved 23 February 2023.
  9. ↑ Creech-Eakman, M. J.; Thompson, R. R. (2009). "The Biggest, Baddest, Coolest Stars ASP Conference Series, Vol. 412". The Biggest. Astronomical Society of the Pacific. 412: 149. Bibcode:2009ASPC..412..149C.
  10. ↑ Thompson, R. R.; Creech-Eakman, M. J. (2004). American Astronomical Society Meeting Abstracts. Vol. 205. American Astronomical Society. Bibcode:2004AAS...205.1205T.
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