27 Lyncis

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]

27 Lyncis
Observation data
Epoch J2000      Equinox J2000
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
Distance250 ± 6 ly
(77 ± 2 pc)
Absolute magnitude (MV)0.36[2]
Details
Mass2.24[4] M☉
Luminosity65.41[2] L☉
Surface gravity (log g)3.96[4] cgs
Temperature10,014±340[4] K
Rotational velocity (v sin i)183[4] km/s
Age157[4] Myr
Other designations
27 Lyn, BD+51°1391, FK5 307, HD 67006, HIP 39847, HR 3173, SAO 26687, WDS J08085+5130A[5]
Database references
SIMBADdata

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. 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. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. 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.
  5. "27 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-06.
  6. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  7. 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, arXiv:1103.4363, Bibcode:2011MNRAS.415..854D, doi:10.1111/j.1365-2966.2011.18765.x.
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