FK Comae Berenices
FK Comae Berenices is a variable star that varies in apparent magnitude between 8.14m and 8.33m over a period of 2.4 days. It is the prototype for the FK Comae Berenices (FK Com) class of variable stars. The variability of FK Com stars may be caused by large, cool spots on the rotating surfaces of the stars. This star is thought to be the result of a recent binary merger, resulting in a high rate of both spin and magnetic activity.[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Coma Berenices |
Right ascension | 13h 30m 46.79937s[1] |
Declination | +24° 13′ 57.7862″[1] |
Apparent magnitude (V) | 8.17 |
Characteristics | |
Spectral type | G4 III[2] |
Variable type | FK Com |
Astrometry | |
Radial velocity (Rv) | −21.0±5.8[2] km/s |
Proper motion (μ) | RA: –51.969[1] mas/yr Dec.: –22.262[1] mas/yr |
Parallax (π) | 4.6102 ± 0.0446[1] mas |
Distance | 707 ± 7 ly (217 ± 2 pc) |
Absolute magnitude (MV) | 1.2[3] |
Details | |
Radius | 4 R☉ |
Luminosity | 30 L☉ |
Rotational velocity (v sin i) | 160[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
References
- 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. Gaia DR2 record for this source at VizieR.
- Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv..17..251S, doi:10.1007/s00159-009-0020-6.
- Korhonen, H., Berdyugina, S. V., Hackman, T., Duemmler, R., Ilyin, I. V., & Tuominen, I. (1999). "Study of FK Comae Berenices. I. Surface images for 1994 and 1995". Astronomy and Astrophysics. 346: 103. Bibcode:1999A&A...346..101K.CS1 maint: uses authors parameter (link)
- Ayres, Thomas R.; et al. (March 2016), "FK Comae Berenices, King of Spin: The COCOA-PUFS Project", The Astrophysical Journal Supplement Series, 223 (1): 30, arXiv:1601.03305, Bibcode:2016ApJS..223....5A, doi:10.3847/0067-0049/223/1/5, 5.
- "FK Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-06.
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