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.

HD 6114
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
Distance310 ± 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
Mass1.65[8] M☉
Luminosity21.2+3.5
−3.0[9] L☉
Surface gravity (log g)4.03±0.14[8] cgs
Temperature7,611±259[8] K
Rotational velocity (v sin i)149[9] km/s
Age863[8] Myr
Other designations
BD+46° 243, HD 6114, HIP 4911, HR 289, SAO 36875, ADS 862, WDS J01030+4723[10]
Database references
SIMBADdata

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
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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 |journal= (help)
  8. 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.
  9. 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.
  10. "HD 6114". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 12, 2018.
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