RV Andromedae is a variable star in the constellation of Andromeda. It is classified as a semiregular variable pulsating giant star, and varies from an apparent visual magnitude of 11.5 at minimum brightness to a magnitude of 9.0 at maximum brightness, with a period of approximately 168.9 days.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 02h 11m 02.56581s[2] |
| Declination | 48° 56′ 45.0634″[2] |
| Apparent magnitude (V) | 9.0–11.5[3] |
| Characteristics | |
| Spectral type | M4e[3] |
| B−V color index | 1.607[4] |
| Variable type | Semi-regular[3] |
| Astrometry | |
| Radial velocity (Rv) | −10.0±2.0[5] km/s |
| Proper motion (μ) | RA: 10.456(48)[2] mas/yr Dec.: −0.958(56)[2] mas/yr |
| Parallax (π) | 1.0950 ± 0.0483 mas[2] |
| Distance | 3,000 ± 100 ly (910 ± 40 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
In 1904, English amateur astronomer Arthur Stanley Williams examined photographic plates taken during the previous two years and determined that RV Andromedae was a variable star whose period he estimated to be 182 days.[6] In 1907, Annie Jump Cannon listed it with its variable star designation in her Second Catalogue of Variable Stars.[7]
This is one of the Mira variables where mode switching of pulsations have been observed; amplitude and periods have been seen decreasing and subsequently increasing back to values near the previous ones.[8]
References
edit- ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 2 November 2024.
- ^ 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.
- ^ a b c d RV 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 2009-06-30.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
- ^ a b "RV And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 12, 2018.
- ^ Williams, A. Stanley (April 1904). "New variable star 17.1904 Andromedae". Astronomische Nachrichten. 165: 125. Bibcode:1904AN....165..125W. doi:10.1002/asna.19041650806. Retrieved 2 November 2024.
- ^ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 2 November 2024.
- ^ Cadmus, R. R. Jr.; et al. (1991), "Observation of Possible Mode Switching in Three Semiregular Variable Stars", Astronomical Journal, 101: 1043, Bibcode:1991AJ....101.1043C, doi:10.1086/115746.
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