1 Lyncis

A light curve for UW Lyncis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 06h 17m 54.81907s[2]
Declination +61° 30′ 55.0251″[2]
Apparent magnitude (V) 4.95[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M3IIIab[5]
U−B color index +1.96[3]
B−V color index +1.83[3]
Variable type Lb?[6]
Astrometry
Radial velocity (Rv)+11.56±0.44[7] km/s
Proper motion (μ) RA: −10.59±0.36[2] mas/yr
Dec.: −3.11±0.29[2] mas/yr
Parallax (π)5.11 ± 0.33 mas[2]
Distance640 ± 40 ly
(200 ± 10 pc)
Absolute magnitude (MV)−1.44[8]
Details
Radius156[9] R☉
Luminosity2,848[10] L☉
Temperature3,485[10] K
Other designations
1 Lyn, UW Lyn, BD+61°869, FK5 2479, HD 42973, HIP 29919, HR 2215, SAO 13787[11]
Database references
SIMBADdata

1 Lyncis is a single[5] 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.[3] It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[7]

The star is an aging red giant of spectral type M3IIIab,[5] currently on the asymptotic giant branch,[4] having exhausted the hydrogen at its core and evolved away from the main sequence. It has been classified as a possible slow irregular variable,[6] after being found to be slightly variable in 1969 by Olin J. Eggen.[12] 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 1,500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.[13] The star has expanded to 156[9] times the Sun's radius and it is radiating 2,848[10] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,485 K.[10]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. 1 2 3 4 5 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. S2CID 18759600.
  3. 1 2 3 4 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode:1986EgUBV........0M.
  4. 1 2 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.
  5. 1 2 3 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. S2CID 14878976.
  6. 1 2 Watson, Christopher (4 January 2010). "UW Lyncis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2016.
  7. 1 2 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. S2CID 17804304.
  8. ↑ 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.
  9. 1 2 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.
  10. 1 2 3 4 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. S2CID 118665352.
  11. ↑ "1 Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 March 2016.
  12. ↑ Eggen, Olin J. (1969). "Light Variations of Small Amplitude in the Red Giants of the Disc Population". Information Bulletin on Variable Stars. 355 (355, #1. (IBVS Homepage)): 1. Bibcode:1969IBVS..355....1E.
  13. ↑ 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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