83 Ursae Majoris

83 Ursae Majoris

A light curve for IQ Ursae Majoris, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 13h 40m 44.27274s[2]
Declination +54° 40′ 53.8860″[2]
Apparent magnitude (V) 4.69 - 4.75[3]
Characteristics
Spectral type M2 III[4]
B−V color index +1.630±0.006[5]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)−18.61±0.20[6] km/s
Proper motion (μ) RA: −19.418 mas/yr[2]
Dec.: −10.63 mas/yr[2]
Parallax (π)5.5963 ± 0.1399 mas[2]
Distance580 ± 10 ly
(179 ± 4 pc)
Absolute magnitude (MV)−1.39[5]
Details
Mass1.1[7] M☉
Radius83.3±3.1[8] R☉
Luminosity1,250[9] L☉
Surface gravity (log g)1.06±0.16[10] cgs
Temperature3,705±16[10] K
Metallicity [Fe/H]−0.1±0.08[10] dex
Other designations
83 UMa, IQ UMa, BD+55°1625, HD 119228, HIP 66738, HR 5154, SAO 28843[11]
Database references
SIMBADdata

83 Ursae Majoris is a candidate binary star[12] system in the northern circumpolar constellation of Ursa Major. It is a semiregular variable star, and it has been given the variable star designation IQ Ursae Majoris. It ranges in brightness from apparent visual magnitude 4.69 to 4.75, making it visible to the naked eye under good observing conditions.[3] Percy and Au (1994) identified it as a small amplitude red variable with an irregular behavior, having a characteristic time scale of 20 days.[13] Based upon an annual parallax shift of 5.60 mas,[2] it is located roughly 580 light years from the Sun. The system is moving closer with a heliocentric radial velocity of −18.6[6] km/s.

The visible component is an evolved red giant with a stellar classification of M2 III.[4] It is a marginal barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material may have been acquired during a previous mass transfer from a now white dwarf companion, or self-enriched by a dredge-up during the asymptotic giant branch process.[14]

References

  1. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  4. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
  5. ^ a b 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.
  6. ^ a b De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: A61, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347.
  7. ^ Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (August 2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy & Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765, ISSN 0004-6361.
  8. ^ Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01), "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble", The Astronomical Journal, 166 (6): 268, Bibcode:2023AJ....166..268B, doi:10.3847/1538-3881/ad08be, ISSN 0004-6256{{citation}}: CS1 maint: multiple names: authors list (link)
  9. ^ Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (2016), "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars", The Astronomical Journal, 151 (3): 59, arXiv:1510.05666, Bibcode:2016AJ....151...59C, doi:10.3847/0004-6256/151/3/59, S2CID 119246448.
  10. ^ a b c Sharma, Kaushal; Prugniel, Philippe; Singh, Harinder P. (2016-01-01), "New atmospheric parameters and spectral interpolator for the MILES cool stars", Astronomy and Astrophysics, 585: A64, arXiv:1512.04882, Bibcode:2016A&A...585A..64S, doi:10.1051/0004-6361/201526111, ISSN 0004-6361 83 UMa's database entry at VizieR.
  11. ^ "83 UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-31.
  12. ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  13. ^ Percy, John R.; Au, Winnie (November 1994), "APT Observations of Small-Amplitude Red Variables", Information Bulletin on Variable Stars, 4114: 1, Bibcode:1994IBVS.4114....1P.
  14. ^ Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.