HD 6114
HD 6114 is a visual binary star system in the northern constellation of Andromeda. With a combined apparent magnitude of 6.46,[2] the star can only be seen with the naked eye by keen-eyed observers even on the best of nights. Based upon an annual parallax shift of 10.4 mas[1] as seen from Earth's orbit, the system is located approximately 96 parsecs (310 ly) distant.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 01h 03m 01.54709s[1] |
Declination | +47° 22′ 34.1724″[1] |
Apparent magnitude (V) | 6.46[2] (6.76 + 8.07)[3] |
Characteristics | |
Spectral type | A9 V[4][5] |
B−V color index | 0.248±0.012[2] |
Astrometry | |
Radial velocity (Rv) | +2.4±2.8[6] km/s |
Proper motion (μ) | RA: +86.96[1] mas/yr Dec.: −15.02[1] mas/yr |
Parallax (π) | 10.41 ± 0.70[1] mas |
Distance | 310 ± 20 ly (96 ± 6 pc) |
Absolute magnitude (MV) | 1.56[2] |
Orbit[7] | |
Period (P) | 450 yr |
Semi-major axis (a) | 0.816″ |
Eccentricity (e) | 0.80 |
Inclination (i) | 87.0° |
Longitude of the node (Ω) | 176.7° |
Periastron epoch (T) | 1902.0 |
Argument of periastron (ω) (secondary) | 180° |
Details | |
HD 6114 A | |
Mass | 1.65[8] M☉ |
Luminosity | 21.2+3.5 −3.0[9] L☉ |
Surface gravity (log g) | 4.03±0.14[8] cgs |
Temperature | 7,611±259[8] K |
Rotational velocity (v sin i) | 149[9] km/s |
Age | 863[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The binary nature of this system was discovered by O. Struve in 1864. It consists of a magnitude 6.76 primary component with a dimmer magnitude 8.07 secondary. As of 2015 the pair had an angular separation of 1.30″ along a position angle of 175°.[3] The two stars orbit each other with a period of 450 years with an eccentricity of 0.80.[7]
The primary is an A-type main-sequence star with a stellar classification of A9 V.[4][5] At the estimated age of 863 million years, it is spinning rapidly with a projected rotational velocity of 149 km/s.[9] The star has 1.65[8] times the mass of the Sun and is radiating 21[9] times the Sun's luminosity from its photosphere at an effective temperature of 7,611 K.[8]
References
- 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.
- 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.
- Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122: 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- Cowley, A.; Fraquelli, D. (1974). "MK Spectral Types for Some Bright F Stars". Publications of the Astronomical Society of the Pacific. 86 (509): 70. Bibcode:1974PASP...86...70C. doi:10.1086/129562.
- Abt, H. A.; Morrell, N. I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
- de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
- Hartkopf, W. I.; et al. (June 30, 2006). "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 2018-10-12. Cite journal requires
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(help) - David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
- Zorec, J.; Royer, F. (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.
- "HD 6114". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 12, 2018.