HD 92589 (HR 4183) is a double star in the constellation Antlia. The system has a combined apparent magnitude of 6.39,[2] placing it near the limit of naked eye visibility. The system is located about 590 light years[1] away based on its parallax shift and has a heliocentric radial velocity of 11 km/s.[5] This indicates that it is drifting away from the Solar System.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h 40m 51.5391s[1] |
| Declination | −35° 44′ 30.1761″[1] |
| Apparent magnitude (V) | 6.39±0.01[2] |
| Characteristics | |
| Spectral type | G8/K0 III + F/G[3] |
| U−B color index | +0.02[4] |
| B−V color index | +0.92[4] |
| Astrometry | |
| Radial velocity (Rv) | 11±5.4[5] km/s |
| Proper motion (μ) | RA: −25.072 mas/yr[1] Dec.: +5.872 mas/yr[1] |
| Parallax (π) | 5.5014 ± 0.1586 mas[1] |
| Distance | 590 ± 20 ly (182 ± 5 pc) |
| Absolute magnitude (MV) | −0.78[6] |
| Details | |
| A | |
| Mass | 2.3[7] M☉ |
| Radius | 13.07[8] R☉ |
| Luminosity | 141[1] L☉ |
| Surface gravity (log g) | 2.54[7] cgs |
| Temperature | 5,171±122[9] K |
| Metallicity [Fe/H] | −0.29[10] dex |
| Rotational velocity (v sin i) | 1.6±1.2[11] km/s |
| B | |
| Mass | 2.96[12] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The system has a composite stellar classification of G8/K0 III + F/G.[3] This indicates that the primary spectrum intermediate between a G8 and K0 giant star while the companion is probably a F-type or G-type star. As of 1991, the pair have a projected separation of 700 mas along a position angle of 48°.[13] Both stars take 1,591 years to orbit each other.[13][12]
At present the visible component has 2.3 times the mass of the Sun[7] but has expanded to 13.07[8] times its girth. It shines with a luminosity 141[1] times greater than the Sun from its enlarged photosphere at an effective temperature of 5,171 K,[9] which gives the yellow hue of a G-type star. HD 92589A is metal-deficient, with an iron abundance only 51%[10] that of the Sun and spins leisurely with a projected rotational velocity of 1.6 km/s,[11] common for giant stars.
References
edit- ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
- ^ a b Deutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976). "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations". The Astrophysical Journal Supplement Series. 30: 97. Bibcode:1976ApJS...30...97D. doi:10.1086/190359. ISSN 0067-0049.
- ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
- ^ a b c Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ a b Anders, F.; et al. (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.
- ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
- ^ a b Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. eISSN 1538-4365.
- ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.