Astronomy:19 Lyncis
From HandWiki
Short description: Star in the constellation Lynx
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|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[1] mas |
| Distance | 680 ± 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[3] mas |
| Distance | 690 ± 10 ly (213 ± 4 pc) |
| Orbit[7] | |
| Primary | 19 Lyn Aa |
| Companion | 19 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 | |
| Mass | 3.33±0.14[8] M☉ |
| Luminosity | 166.0+41.5 −33.3[8] L☉ |
| Temperature | 12,078+84 −83[8] K |
| Rotational velocity (v sin i) | 70[8] km/s |
| 19 Lyn B | |
| Mass | 3.03±0.14[8] M☉ |
| Luminosity | 127.9+32.1 −25.6[8] L☉ |
| Temperature | 10,691+49 −50[8] K |
| Rotational velocity (v sin i) | 275[8] km/s |
| Other designations | |
| 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 | |
| SIMBAD | 19 Lyn A |
| 19 Lyn B | |
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.
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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 3.2 3.3 3.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 4.3 Murphy, R. E. (November 1969). "A spectroscopic investigation of visual binaries with B-type primaries.". Astronomical Journal 74: 1082–1094. doi:10.1086/110908. Bibcode: 1969AJ.....74.1082M.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 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. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K.
- ↑ 7.0 7.1 Pourbaix, D. et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics 424: 727–732. doi:10.1051/0004-6361:20041213. Bibcode: 2004A&A...424..727P.
- ↑ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ "* 19 Lyn A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+19+Lyn+A.
- ↑ "* 19 Lyn B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+19+Lyn+B.
- ↑ 11.0 11.1 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.
- ↑ Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 58. ISBN 9781441968517. https://books.google.com/books?id=waO6tUtfblsC&pg=PA58.
 |  |
