19 Lyncis

19 Lyncis is a triple star[11] system in the northern constellation of Lynx. A telescope reveals it consists of two blue-white hued stars of magnitudes 5.80 and 6.86[2] that are 14.750 arcseconds[11] apart, with a visual companion of magnitude 7.6 that is 3.5 arcminutes distant.[12] The first two are located around 680–690 light years away from the Sun, based on parallax measurements. Their radial velocity measurements are poorly constrained, but suggest the system is trending away from the Earth.

19 Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
19 Lyn A
Right ascension 07h 22m 52.05811s[1]
Declination +55° 16′ 53.0226″[1]
Apparent magnitude (V) 5.80[2]
19 Lyn B
Right ascension 07h 22m 50.84965s[3]
Declination +55° 17′ 03.54920″[3]
Apparent magnitude (V) 6.86[2]
Characteristics
19 Lyn A
Spectral type B8 V[4]
B−V color index −0.078±0.005[2]
19 Lyn B
Spectral type B9 V[4]
B−V color index −0.051±0.008[2]
Astrometry
19 Lyn A
Radial velocity (Rv)5.2±2[5] km/s
Proper motion (μ) RA: −2.806[1] mas/yr
Dec.: −31.485[1] mas/yr
Parallax (π)4.7743 ± 0.1525 mas[1]
Distance680 ± 20 ly
(209 ± 7 pc)
19 Lyn B
Radial velocity (Rv)10.00±3.7[6] km/s
Proper motion (μ) RA: −2.612[3] mas/yr
Dec.: −30.802[3] mas/yr
Parallax (π)4.6939 ± 0.0784 mas[3]
Distance690 ± 10 ly
(213 ± 4 pc)
Orbit[7]
Primary19 Lyn Aa
Companion19 Lyn Ab
Period (P)2.2596 d
Eccentricity (e)0.08
Longitude of the node (Ω)126.1°
Periastron epoch (T)2,419,031.632 JD
Semi-amplitude (K1)
(primary)		106.4 km/s
Semi-amplitude (K2)
(secondary)		199.1 km/s
Details
19 Lyn A
Mass3.33±0.14[8] M☉
Luminosity166.0+41.5
−33.3[8] L☉
Temperature12,078+84
−83[8] K
Rotational velocity (v sin i)70[8] km/s
19 Lyn B
Mass3.03±0.14[8] M☉
Luminosity127.9+32.1
−25.6[8] L☉
Temperature10,691+49
−50[8] K
Rotational velocity (v sin i)275[8] km/s
Other designations
19 Lyn, BD+55°1192, CCDM J07228+5518, WDS J07229+5517
19 Lyn A: HD 57103, HIP 35785, HR 2784, SAO 26312[9]
19 Lyn B: GC 9799, HD 57102, HIP 35783, HR 2783, SAO 26311[10]
Database references
SIMBAD19 Lyn A
19 Lyn B

The primary, designated component A, is itself a double-lined spectroscopic binary system with an orbital period of 2.26 days and an eccentricity of 0.08.[7] The more prominent member of this pair, component Aa, is a B-type main-sequence star with a stellar classification of B8 V.[4] It has 3.33[8] times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s.[8] Component B has a class of B9 V,[4] an estimated 3.03 times the mass of the Sun, and is spinning rapidly with a projected rotational velocity of 275 km/s.[8]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. S2CID 119257644.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. Murphy, R. E. (November 1969). "A spectroscopic investigation of visual binaries with B-type primaries". Astronomical Journal. 74: 1082–1094. Bibcode:1969AJ.....74.1082M. doi:10.1086/110908.
  5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  6. Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  7. Pourbaix, D.; et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics. 424: 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  8. Zorec, J.; Royer, F. (January 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.
  9. "* 19 Lyn A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 August 2017.
  10. "* 19 Lyn B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 August 2017.
  11. 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. S2CID 14878976.
  12. Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 58. ISBN 9781441968517.
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