HD 88218

HD 88218 (HR 3992) is a binary star in the southern constellation Antlia. The system has a combined apparent magnitude of 6.14,[2] making it faintly visible to the naked eye. HD 88218 is relatively close at a distance of 103 light years[1] but is receding with a heliocentric radial velocity of 36.7 km/s.[5]

HD 88218
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 09m 31.7681s[1]
Declination −35° 51′ 24.4042″[1]
Apparent magnitude (V) 6.14[2]
Characteristics
Spectral type G0 V[3]
U−B color index +0.16[4]
B−V color index +0.6[4]
Astrometry
Radial velocity (Rv)36.7±0.1[5] km/s
Proper motion (μ) RA: −445.632 mas/yr[1]
Dec.: +18.774 mas/yr[1]
Parallax (π)31.5137 ± 0.0307 mas[1]
Distance103.5 ± 0.1 ly
(31.73 ± 0.03 pc)
Absolute magnitude (MV)+3.64[2]
Details
A
Mass1.07±0.03[6] M☉
Radius1.66[7] R☉
Luminosity2.88[7] L☉
Surface gravity (log g)4.03±0.03[8] cgs
Temperature5,878±14[8] K
Metallicity [Fe/H]−0.14±0.01[8] dex
Rotational velocity (v sin i)3[9] km/s
Age6.8+0.49
−0.41[10] Gyr
B
Mass0.69[11] M☉
Other designations
49 G. Antliae[12], CD−35°6194, CPD−35°3974, FK5 2816, GJ 379.1, HD 88218, HIP 49796, HR 3992, SAO 201109, WDS J10095-3551AB[13]
Database references
SIMBADdata

The visible component has a stellar classification of G0 V, indicating the object's status as a solar analogue. As for the companion, it is probably a K-type star based on a mass of 0.69 M☉.[11] As of 2018, both stars have a projected separation of 700 mas along a position angle of 0°.[14] The system has an orbital period of 86.6 years.[11]

Despite the class described above, the primary is starting to evolve off the main sequence at the age of 6.8 billion years, having a low surface gravity[8] and a slightly enlarged radius of 1.66 R☉,[7] with the addition of being chromospherically inactive.[3] Nevertheless, it has 107% the mass of the Sun[6] and radiates at 2.88 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 5,870 K,[8] giving a yellow glow. HD 88218 A has an iron abundance 72% that of the Sun[8] and spins leisurely with a projected rotational velocity of 3 km/s.[9]

References
  1. 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.
  2. 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 255204555.
  3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256.
  4. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S. (August 2002). "Radial Velocities for 889 Late‐Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. eISSN 1538-4365. ISSN 0067-0049.
  6. Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. eISSN 1432-0746. ISSN 0004-6361.
  7. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
  8. Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D.; Monteiro, M. J. P. F. G. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics. 487 (1): 373–381. arXiv:0805.4826. Bibcode:2008A&A...487..373S. doi:10.1051/0004-6361:200809698. eISSN 1432-0746. ISSN 0004-6361.
  9. Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  10. Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. eISSN 1432-0746. ISSN 0004-6361.
  11. Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 87. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87. eISSN 1538-3881. ISSN 0004-6256.
  12. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  13. "HR 3992". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 17, 2022.
  14. 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.
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