W Andromedae
| 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 | |
| Evolutionary stage | AGB[4] |
| Spectral type | S6,1e-S9,2e[3] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | −38.19±0.4[5] km/s |
| Proper motion (μ) | RA: −0.152[2] mas/yr Dec.: −2.516[2] mas/yr |
| Parallax (π) | 2.2125±0.0953 mas[2] |
| Distance | 1,470 ± 60 ly (450 ± 20 pc) |
| Absolute magnitude (MV) | −5.27[4] |
| Details | |
| Mass | 5.6[6] M☉ |
| Luminosity | 8,394[7] L☉ |
| Surface gravity (log g) | −0.61[6] cgs |
| Temperature | 3,030[6] K |
| Metallicity [Fe/H] | 0.003[6] dex |
| Other designations | |
| HD 14028, BD+43 461a, HIP 10687, HR 663 | |
| Database references | |
| SIMBAD | data |
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.[4]
References
- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ a b c d e 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.
- ^ 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.
- ^ a b c 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "W And". International Variable Star Index. AAVSO. Retrieved 2023-04-22.
- ^ Anderson, Thomas D. (January 1899). "New Variable Star in Andromeda". Astronomische Nachrichten. 148 (11): 175. Bibcode:1899AN....148..175A. doi:10.1002/asna.18991481108. Retrieved 10 November 2024.
- ^ 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.
- ^ 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.