Astronomy:DU Lyncis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 350 ± 10 ly (109 ± 4 pc) |
| Absolute magnitude (MV) | −0.46[2] |
| Details | |
| Luminosity | 536[6] L☉ |
| Temperature | 3,779[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 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 Glass, I. S.; Van Leeuwen, F. (2007). "Semiregular variables in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 378 (4): 1543–1549. doi:10.1111/j.1365-2966.2007.11903.x. Bibcode: 2007MNRAS.378.1543G.
- ↑ 4.0 4.1 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 McDonald, I. et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=DU+Lyncis.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal 104: 275, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ Watson, Christopher (4 January 2010). "DU Lyncis". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=18039. Retrieved 20 March 2016.
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