Astronomy:31 Lyncis

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Short description: Star in the constellation Lynx
31 Lyncis
BNLynLightCurve.png
A light curve for BN Lyncis, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lynx
Right ascension  08h 22m 50.11000s[2]
Declination +43° 11′ 17.2724″[2]
Apparent magnitude (V) +4.25[3]
Characteristics
Spectral type K4+ III[4]
B−V color index 1.550±0.003[5]
Variable type SRd[6]
Astrometry
Radial velocity (Rv)+24.56±0.22[5] km/s
Proper motion (μ) RA: −25.16±0.36[2] mas/yr
Dec.: −99.23±0.21[2] mas/yr
Parallax (π)8.53 ± 0.25[2] mas
Distance380 ± 10 ly
(117 ± 3 pc)
Absolute magnitude (MV)−1.09[5]
Details[7]
Mass1.95±0.18 M☉
Radius53.27+1.64
−1.55 R☉
Luminosity782.4±60.3 L☉
Surface gravity (log g)1.46±0.12[8] cgs
Temperature3,921±19[8] K
Metallicity [Fe/H]−0.06±0.05[8] dex
Age1.32±0.23 Gyr
Other designations
Alsciaukat, 31 Lyn, BN Lyn, NSV 4030, BD+43°1815, FK5 314, GC 11401, HD 70272, HIP 41075, HR 3275, SAO 42319[9]
Database references
SIMBADdata

31 Lyncis is the fourth-brightest star in the constellation of Lynx. It has the traditional name Alsciaukat, pronounced /ælʃiˈɔːkæt/.[10] The orange-hued star is visible to the naked eye with a baseline apparent visual magnitude of +4.25.[3] It is a single[11] star located about 380 light years away from the Sun, based on parallax,[2] and is moving further away with a heliocentric radial velocity of +25 km/s.[5]

This object is an aging giant star with a stellar classification of K4+ III.[4] A 1993 study found that it varied in brightness by 0.05 magnitude over 25 to 30 days.[12] On the other hand, a 2002 study of the Hipparcos data found a period of 3.5 days.[13] It is classified as a semiregular variable with a brightness that ranges from 4.21 to as low as 4.27, and has the variable star designation BN Lyncis.[6]

31 Lyncis is 1.3 billion years old with almost double the mass of the Sun. With the supply of hydrogen at its core exhausted, the star has expanded to 53 times the Sun's radius. It is radiating around 782[7] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,921 K.[8]

Nomenclature

31 Lyncis is the star's Flamsteed designation.

It bore the traditional names Alsciaukat, from Arabic الشوكة aš-šawkat "the thorn", and Mabsuthat, from Arabic المبسوطة al-mabsūtah "the outstretched (paw)".[14] In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Alsciaukat for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[10]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 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. 
  4. ↑ 4.0 4.1 Keenan, P.; McNeil, R. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245–266. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  5. ↑ 5.0 5.1 5.2 5.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  7. ↑ 7.0 7.1 Baines, E. et al. (2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 155 (1): 30. doi:10.3847/1538-3881/aa9d8b. Bibcode: 2018AJ....155...30B. 
  8. ↑ 8.0 8.1 8.2 8.3 Sharma, Kaushal; Prugniel, Philippe; Singh, Harinder P. (2016). "New atmospheric parameters and spectral interpolator for the MILES cool stars". Astronomy & Astrophysics 585: 27. doi:10.1051/0004-6361/201526111. A64. Bibcode: 2016A&A...585A..64S. 
  9. ↑ "27 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=27+Lyn. 
  10. ↑ 10.0 10.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Percy, John R. (1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific 105 (694): 1422–26. doi:10.1086/133324. Bibcode: 1993PASP..105.1422P. 
  13. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  14. ↑ Allen, Richard Hinckley (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York City , NY: Dover Publications Inc.. p. 280. ISBN 0-486-21079-0. https://archive.org/details/starnamestheirlo00alle/page/280. 
  15. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. 



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