15 Lyncis

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15 Lyncis
Observation data
Epoch J2000        Equinox J2000
Constellation Lynx
Right ascension 06h 57m 16.60526s [1]
Declination +58° 25′ 21.9404″ [1]
Apparent magnitude  (V)4.35 [2] (4.7 / 5.8) [3]
Characteristics
Spectral type G8III + F8V [4]
U−B color index +0.51 [5]
B−V color index +0.85 [5]
Astrometry
Radial velocity (Rv)1.86±0.28 [6]  km/s
Proper motion (μ)RA: 6.08 [1]   mas/yr
Dec.: -122.83 [1]   mas/yr
Parallax (π)18.29 ± 0.25  mas [1]
Distance 178 ± 2  ly
(54.7 ± 0.7  pc)
Orbit [7]
Period (P)262.0 yr
Semi-major axis (a)1.19″
Eccentricity (e)0.74
Inclination (i)78.0°
Longitude of the node (Ω)43.4°
Periastron epoch (T)B 1992.68
Argument of periastron (ω)
(secondary)		98.0°
Details [6]
15 Lyn A
Radius 8  R☉
Luminosity 40  L☉
Surface gravity (log g)3.0  cgs
Temperature 5,164±5  K
Metallicity [Fe/H]0.05  dex
Other designations
15 Lyn, BD+58° 982, HD  50522, HIP  33449, HR  2560, SAO  26051
Database references
SIMBAD data

15 Lyncis is a binary star system in the northern constellation of Lynx. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.35. [2] Based on the system's parallax, it is located 178 light-years (54.7 parsecs) away. [1] The pair are moving away from the Earth with a heliocentric radial velocity of +2 km/s. [6]

A telescope reveals it is formed by two yellowish stars of magnitudes 4.7 and 5.8 that are 0.9 arcseconds apart. [3] The two stars orbit each other every 262 years and the orbital eccentricity is 0.74. [7] The components are a magnitude 4.7 evolved giant star of spectral type G8III, and a magnitude 5.8 F-type main-sequence star of spectral type F8V. [4] The former has exhausted the hydrogen at its core, causing it to expand to 8 times the Sun's radius. It is radiating 40 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,164 K. [6]

References

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (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. S2CID   18759600.
  2. 1 2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 58. ISBN   9781441968517.
  4. 1 2 Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy and Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi: 10.1051/0004-6361/201219774 . A69.
  5. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. 1 2 3 4 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode:2008AJ....135..209M. doi: 10.1088/0004-6256/135/1/209 . S2CID   121883397.
  7. 1 2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 30 July 2017.
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