Astronomy:27 Lyncis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lynx |
| Right ascension | 08h 08m 27.44632s[1] |
| Declination | +51° 30′ 24.0055″[1] |
| Apparent magnitude (V) | 4.78[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A2 V[3] |
| B−V color index | 0.048±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.0±4.2[2] km/s |
| Proper motion (μ) | RA: −60.95[1] mas/yr Dec.: −3.11[1] mas/yr |
| Parallax (π) | 13.04 ± 0.31[1] mas |
| Distance | 250 ± 6 ly (77 ± 2 pc) |
| Absolute magnitude (MV) | 0.36[2] |
| Details | |
| Mass | 2.24[4] M☉ |
| Luminosity | 65.41[2] L☉ |
| Surface gravity (log g) | 3.96[4] cgs |
| Temperature | 10,014±340[4] K |
| Rotational velocity (v sin i) | 183[4] km/s |
| Age | 157[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
27 Lyncis is a single[6] star in the northern constellation of Lynx. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.78.[2] This object is located around 250 light years away from the Sun, as determine from parallax measurements.[1] It is moving further from the Sun with a heliocentric radial velocity of +11 km/s.[2]
This is an ordinary A-type main-sequence star with a stellar classification of A2 V,[3] which indicates it is generating energy through hydrogen fusion at its core. It is 157[4] million years old and is spinning with a projected rotational velocity of 183.[4] The star has 2.24[4] times the mass of the Sun and is radiating 65[2] times the Sun's luminosity from its photosphere at an effective temperature of 10,014 K.[4] X-ray emission is being detected near these coordinates, which may be coming from an undetected companion or a background source.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "27 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=27+Lyn.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ De Rosa, R. J. et al. (July 2011), "The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars", Monthly Notices of the Royal Astronomical Society 415 (1): 854–866, doi:10.1111/j.1365-2966.2011.18765.x, Bibcode: 2011MNRAS.415..854D.
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