| 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.
Joel Stebbins observed the star for more than thirty nights from 1924 through 1927, and discovered that it is a variable star.[11] It was given its variable star designation, TU Cameleopardis, in 1936.[12] The orbital plane is oriented near the line of sight from the Earth, making this a Beta Lyrae–type eclipsing binary variable star. 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 "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.
- ^ Stebbins, Joel (1928). "Photo-Electric Photometry of Stars. Chapter VIII. Discovery of Eclipsing Stars". Publications of the Washburn Observatory. 15: 55–58. Bibcode:1928PWasO..15...55S. Retrieved 30 December 2024.
- ^ Guthnick, P.; Prager, R. (October 1936). "Benennung von veränderlichen Sternen". Astronomische Nachrichten. 260 (22): 393–412. Bibcode:1936AN....260..393G. doi:10.1002/asna.19362602202. Retrieved 30 December 2024.
