RV Andromedae
Appearance
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 02h 11m 02.5681s[1] |
Declination | 48° 56′ 45.048″[1] |
Apparent magnitude (V) | 9.0 - 11.5[2] |
Characteristics | |
Spectral type | M4e[2] |
B−V color index | 1.607[3] |
Variable type | Semi-regular[2] |
Astrometry | |
Radial velocity (Rv) | −10.0±2.0 [4] km/s |
Proper motion (μ) | RA: 11.16±0.92[1] mas/yr Dec.: −1.67±0.97[1] mas/yr |
Parallax (π) | 0.62 ± 0.98 mas[1] |
Other designations | |
Database references | |
SIMBAD | data |
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.[2]
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.[5]
References
- ^ a b c d e 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. Vizier catalog entry
- ^ 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.
- ^ "RV And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 12, 2018.
- ^ 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.