1 Lyncis

1 Lyncis is a single[4] star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95.[2] It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[5]

1 Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension  06h 17m 54.81907s[1]
Declination +61° 30′ 55.0251″[1]
Apparent magnitude (V) 4.95[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M3IIIab[4]
U−B color index +1.96[2]
B−V color index +1.83[2]
Variable type Lb
Astrometry
Radial velocity (Rv)+11.56±0.44[5] km/s
Proper motion (μ) RA: −10.59±0.36[1] mas/yr
Dec.: −3.11±0.29[1] mas/yr
Parallax (π)5.11 ± 0.33[1] mas
Distance640 ± 40 ly
(200 ± 10 pc)
Absolute magnitude (MV)−1.44[6]
Details
Radius156[7] R☉
Luminosity2,848[8] L☉
Temperature3,485[8] K
Other designations
1 Lyn, UW Lyn, BD+61°869, FK5 2479, HD 42973, HIP 29919, HR 2215, SAO 13787[9]
Database references
SIMBADdata

The star is an aging red giant of spectral type M3IIIab,[4] currently on the asymptotic giant branch,[3] having exhausted the hydrogen at its core and evolved away from the main sequence. It has been classified as a slow irregular variable,[10] after being found to be slightly variable in 1969 by Olin J. Eggen.[11] Its changes in brightness are complex, with two shorter changeable periods of 35–40 and 47–50 days due to the star's pulsations, and a longer period of 1500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.[12] The star has expanded to 156[7] times the Sun's radius and it is radiating 2,848[8] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,485 K.[8]

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. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode:1986EgUBV........0M.
  3. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  5. Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  6. 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.
  7. 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.
  8. McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  9. "1 Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 March 2016.
  10. Watson, Christopher (4 January 2010). "UW Lyncis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2016.
  11. Eggen, Olin J. (1969). "Light Variations of Small Amplitude in the Red Giants of the Disc Population". Information Bulletin on Variable Stars (355, #1. (IBVS Homepage)). Bibcode:1969IBVS..355....1E.
  12. Percy, John R.; Wilson, Joseph B.; Henry, Gregory W. (2001). "Long-Term VRI Photometry of Small-Amplitude Red Variables. I. Light Curves and Periods". The Publications of the Astronomical Society of the Pacific. 113 (786): 983–96. Bibcode:2001PASP..113..983P. doi:10.1086/322153.
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