Summary
HD 6114 is a visual binary star system in the northern constellation of Andromeda. With a combined apparent magnitude of 6.46,[6] 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 108 parsecs (350 ly) distant.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| HD 6114 A | |
| Right ascension | 01h 03m 01.54722s[1] |
| Declination | +47° 22′ 34.1796″[1] |
| Apparent magnitude (V) | 6.76[2] |
| HD 6114 B | |
| Right ascension | 01h 03m 01.55854s[3] |
| Declination | +47° 22′ 33.0207″[3] |
| Apparent magnitude (V) | 8.07[2] |
| Characteristics | |
| Spectral type | A9 V[4][5] |
| Apparent magnitude (V) | 6.46[6] |
| B−V color index | 0.248±0.012[6] |
| Astrometry | |
| HD 6114 A | |
| Radial velocity (Rv) | +2.4±2.8[7] km/s |
| Proper motion (μ) | RA: 87.411±0.040[1] mas/yr Dec.: −15.153±0.024[1] mas/yr |
| Parallax (π) | 9.2058 ± 0.0392 mas[1] |
| Distance | 354 ± 2 ly (108.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.56[6] |
| HD 6114 B | |
| Proper motion (μ) | RA: 87.190±0.103[3] mas/yr Dec.: −23.426±0.042[3] mas/yr |
| Parallax (π) | 9.4797 ± 0.0651 mas[3] |
| Distance | 344 ± 2 ly (105.5 ± 0.7 pc) |
| Orbit[8] | |
| 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[9] M☉ |
| Luminosity | 21.2+3.5 −3.0[10] L☉ |
| Surface gravity (log g) | 4.03±0.14[9] cgs |
| Temperature | 7,611±259[9] K |
| Rotational velocity (v sin i) | 149[10] km/s |
| Age | 863[9] 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°.[2] The two stars orbit each other with a period of 450 years with an eccentricity of 0.80.[8]
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.[10] The star has 1.65[9] times the mass of the Sun and is radiating 21[10] times the Sun's luminosity from its photosphere at an effective temperature of 7,611 K.[9]
References edit
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b 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.
- ^ a b 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.
- ^ a b c d 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.
- ^ 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, S2CID 59451347, A61.
- ^ a b Hartkopf, W. I.; et al. (June 30, 2006). "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2018-10-12.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b c d e f 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. S2CID 33401607.
- ^ a b c d 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. S2CID 55586789.
- ^ "HD 6114". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 12, 2018.