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W Andromedae

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W Andromedae

The visual band light curve of W Andromedae, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 02h 17m 32.96122s[2]
Declination +44° 18′ 17.7573″[2]
Apparent magnitude (V) 6.7 – 14.6[3]
Characteristics
Spectral type S6,1e-S9,2e[3]
Variable type Mira[3]
Astrometry
Radial velocity (Rv)−38.19±0.4[4] km/s
Proper motion (μ) RA: −0.162[2] mas/yr
Dec.: −2.516[2] mas/yr
Parallax (π)2.2125 ± 0.0953 mas[2]
Distance1,470 ± 60 ly
(450 ± 20 pc)
Absolute magnitude (MV)−5.27[5]
Details
Mass5.6[6] M☉
Luminosity8,394[7] L☉
Surface gravity (log g)−0.61[6] cgs
Temperature3,030[6] K
Metallicity [Fe/H]0.003[6] dex
Other designations
HD 14028, BD+43 461a, HIP 10687, HR 663
Database references
SIMBADdata

W Andromedae is a variable star in the constellation of Andromeda. It is classified as a Mira variable and S-type star,[8] 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.[3]

W Andromedae was discovered by Thomas David Anderson in 1899.[9]

W Andromedae is an S-type AGB star,[10] in the process of expelling its red giant envelope into space. Line emission from the 115 GHz rotational transition of carbon monoxide was detected in 1986 by Benjamin Zuckerman et al. The width of the emission line indicated that the star is surrounded by a circumstellar envelope expanding at 11 km/sec.[11] The star is losing mass due to stellar winds at a rate of 2.79×10−7 M☉/yr.[5]


References

[edit]
  1. ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. ^ a b c d Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. ^ 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. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. ^ a b 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: A4. arXiv:1002.2458. Bibcode:2010A&A...513A...4G. doi:10.1051/0004-6361/200911764. S2CID 119193286.
  6. ^ a b c d 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.
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.
  8. ^ "W And". International Variable Star Index. AAVSO. Retrieved 2023-04-22.
  9. ^ Anderson, Thomas D. (January 1899). "New Variable Star in Andromeda". Astronomische Nachrichten. 148: 175. Bibcode:1899AN....148..175A. doi:10.1002/asna.18991481108. Retrieved 10 November 2024.
  10. ^ Bieging, J. H.; Shaked, S.; Gensheimer, P. D. (November 2000). "Submillimeter- and Millimeter-Wavelength Observations of SIO and HCN in Circumstellar Envelopes of AGB Stars". The Astrophysical Journal. 543 (2): 897–921. Bibcode:2000ApJ...543..897B. doi:10.1086/317129. Retrieved 10 November 2024.
  11. ^ Zuckerman, B.; Dyck, H. M.; Claussen, M. J. (May 1986). "Carbon Monoxide Emission from Stars in the IRAS and Revised AFGL Catalogs. II. Massive Carbon Stars". Astrophysical Journal. 304: 401–408. Bibcode:1986ApJ...304..401Z. doi:10.1086/164174. Retrieved 10 November 2024.


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