W Andromedae

W Andromedae is a variable star in the constellation of Andromeda. It is classified as a Mira variable of S-type star,[6] and varies from an apparent visual magnitude of 14.6 at minimum brightness to a magnitude of 6.7 at maximum brightness, with a period of approximately 397.3 days.[2] The star is losing mass due to stellar winds at a rate of 2.79×10−7 M☉/yr.[5]

W Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 17m 32.14956s[1]
Declination +26° 59′ 45.73676″[1]
Apparent magnitude (V) 6.7 – 14.6 variable [2]
Characteristics
Spectral type S6,1e-S9,2e[2]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)-38.19 ± 0.4[3] km/s
Proper motion (μ) RA: -0.19 ± 1.19 [4] mas/yr
Dec.: -2.77 ± 1.37 [4] mas/yr
Parallax (π)2.23 ± 3.39[4] mas
Absolute magnitude (MV)-5.27[5]
Other designations
HD 14028, BD+43 461a, HIP 10687, HR 663.
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. W 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 2009-06-22.
  3. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (December 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 340: 165–186, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
  4. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  5. Guandalini, R. (April 2010). "Infrared photometry and evolution of mass-losing AGB stars. III. Mass loss rates of MS and S stars". Astronomy and Astrophysics. 513. arXiv:1002.2458. Bibcode:2010A&A...513A...4G. doi:10.1051/0004-6361/200911764.
  6. International Variable Star Index, Accessed 2012-01-19


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