31 Camelopardalis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 54m 57.82481s[2] |
| Declination | 59° 53′ 18.1314″[2] |
| Apparent magnitude (V) | 5.20[3] |
| Characteristics | |
| Spectral type | A2V[4] (A0IV F0)[5] |
| U−B color index | 0.03[6] |
| B−V color index | 0.010[3] |
| Variable type | β Lyr[7] |
| Astrometry | |
| Radial velocity (Rv) | −2.9±0.9[8] km/s |
| Proper motion (μ) | RA: 1.488[2] mas/yr Dec.: −17.928[2] mas/yr |
| Parallax (π) | 7.1562 ± 0.2336 mas[2] |
| Distance | 460 ± 10 ly (140 ± 5 pc) |
| Orbit[9] | |
| Period (P) | 2.9333 d |
| Eccentricity (e) | 0.00 |
| Longitude of the node (Ω) | 0.00° |
| Periastron epoch (T) | 2,423,443.05±10.00 JD |
| Semi-amplitude (K1) (primary) | 78.0 km/s |
| Details | |
| 31 Cam A | |
| Mass | 3.03±0.08[10] M☉ |
| Luminosity | 179.8 31.7 −26.9 L☉ |
| Temperature | 9,183 149 −147 K |
| Rotational velocity (v sin i) | 75[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
31 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a dim point of light with a peak apparent visual magnitude of 5.12.[7] Parallax measurements provide a distance estimate of approximately 460 light years away from the Sun,[2] and the system is drifting closer to the Earth with a radial velocity of −3 km/s.[8]
This is a single-lined spectroscopic binary in a circular orbit with an orbital period of 2.93 days.[9] It is a detached binary with two main sequence components that do not fill their Roche lobes. The orbital plane is oriented near the line of sight from the Earth, making this a Beta Lyrae–type eclipsing binary variable star. It has the variable star designation TU Cameleopardis, while 31 Camelopardalis is the Flamsteed designation.[4] The primary eclipse lowers the visual magnitude to 5.29, while the secondary eclipse lowers it to 5.22.[7]
References
[edit]- ^ West, Richard M. (January 1968). "Light-curves and elements of the eclipsing binary TU Cam". Bulletin of the Astronomical Institutes of the Netherlands Supplement. 2: 259–276. Bibcode:1968BANS....2..259W.
- ^ a b c d e f 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.
- ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c "31 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 April 2017.
- ^ Mezzetti, M.; et al. (1980). "Revised photometric elements of eight eclipsing binaries". Astronomy and Astrophysics Supplement Series. 42: 15–22. Bibcode:1980A&AS...42...15M.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b c Avvakumova, E. A.; et al. (October 2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ a b Lucy, L. B.; Sweeney, M. A. (August 1971). "Spectroscopic binaries with circular orbits". Astronomical Journal. 76: 544–556. Bibcode:1971AJ.....76..544L. doi:10.1086/111159.
- ^ a b Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
