DU Lyncis

DU Lyncis is a single[8] variable star in the constellation Lynx. It is a faint star but visible to the naked eye with an apparent visual magnitude of 5.15.[2] With an annual parallax shift of 9.2 mas,[1] it is located some 350 light years from the Sun. The star is moving closer with a heliocentric radial velocity of −37 km/s.[5]

DU Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 07h 46m 39.28149s[1]
Declination +37° 31′ 02.6318″[1]
Apparent magnitude (V) 5.15[2]
Characteristics
Spectral type M3 III[3]
B−V color index 1.588±0.010[2]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)−37.20±0.21[5] km/s
Proper motion (μ) RA: +27.245[1] mas/yr
Dec.: +12.499[1] mas/yr
Parallax (π)9.2149 ± 0.2986 mas[1]
Distance350 ± 10 ly
(109 ± 4 pc)
Absolute magnitude (MV)−0.46[2]
Details
Luminosity536[6] L☉
Temperature3,779[6] K
Other designations
DU Lyn, NSV 3721, BD+37 1769, FK5 1199, HD 62647, HIP 37946, HR 2999, SAO 60328[7]
Database references
SIMBADdata

This is an aging red giant star with a stellar classification of M3 III, indicating that it has consumed the hydrogen at its core and evolved away from the main sequence. Eggen lists it as being on the asymptotic giant branch.[9] It has been classified as a semiregular variable of type SRb,[4] ranging from magnitude 5.18 down to 5.31[10] with periods of 360 and possibly 22 days.[3] It shines with a luminosity approximately 536 times that of the Sun and has an effective temperature of 3,779 K.[6]

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.
  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. Glass, I. S.; Van Leeuwen, F. (2007). "Semiregular variables in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 378 (4): 1543–1549. arXiv:0704.3150. Bibcode:2007MNRAS.378.1543G. doi:10.1111/j.1365-2966.2007.11903.x. S2CID 14332208.
  4. Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. 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.
  7. "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 September 2018.
  8. 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.
  9. Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  10. Watson, Christopher (4 January 2010). "DU Lyncis". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 March 2016.
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