T Andromedae

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T Andromedae
TAndLightCurve.png
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]
Distance approx. 5,500  ly
(approx. 1,700  pc)
Details
Mass 4.9 [5]   M☉
Luminosity 8.928 [6]   L☉
Surface gravity (log g)−0.51 [5]   cgs
Temperature 3,235 [5]   K
Metallicity [Fe/H]−0.39 [5]   dex
Other designations
BD +26°43, HD 1795, SAO 73930
Database references
SIMBAD data

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. 412. Astronomical Society of the Pacific: 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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