Astronomy:83 Ursae Majoris
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 40m 44.27335s[2] |
| Declination | +54° 40′ 53.8891″[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: −19.06[2] mas/yr Dec.: −10.56[2] mas/yr |
| Parallax (π) | 6.23 ± 0.22[2] mas |
| Distance | 520 ± 20 ly (161 ± 6 pc) |
| Absolute magnitude (MV) | −1.39[5] |
| Details | |
| Mass | 1.1[7] M☉ |
| Radius | 80[8] R☉ |
| Luminosity | 1,250[9] L☉ |
| Surface gravity (log g) | 0.62[7] cgs |
| Temperature | 3,579[7] K |
| Metallicity [Fe/H] | −0.07[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
83 Ursae Majoris is a candidate binary star[11] 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.[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.[12] Based upon an annual parallax shift of 6.23±0.22 mas,[2] it is located roughly 520 light years from the Sun. The distance derived from its Gaia Early Data Release 3 parallax is 179 pc.[13] 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
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 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.
- ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 4.0 4.1 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, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: A61, doi:10.1051/0004-6361/201219219, Bibcode: 2012A&A...546A..61D.
- ↑ 7.0 7.1 7.2 7.3 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (August 2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy & Astrophysics 628: A94, doi:10.1051/0004-6361/201935765, ISSN 0004-6361, Bibcode: 2019A&A...628A..94A.
- ↑ Stassun, Keivan G. et al. (2019-10-01), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, ISSN 0004-6256, Bibcode: 2019AJ....158..138S.
- ↑ 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, doi:10.3847/0004-6256/151/3/59, Bibcode: 2016AJ....151...59C.
- ↑ "83 UMa". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=83+UMa.
- ↑ 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.
- ↑ 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.
- ↑ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021), "Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3", The Astronomical Journal 161 (3): 147, doi:10.3847/1538-3881/abd806, Bibcode: 2021AJ....161..147B.
- ↑ Gomez, A. E. et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics 319: 881, Bibcode: 1997A&A...319..881G.
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