HD 88836

HD 88836, also known as HR 4019, is a solitary, yellow-hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.32,[2] placing it near the limit for naked eye visibility. Based on an annual parallax shift of 7.019 mas, the object is estimated to be 465 light years away from the Solar System.[1] Its distance from the Sun does not appear to be changing, having a radial velocity of 0 km/s.[5]

HD 88836
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 13m 56.55764s[1]
Declination −40° 18′ 38.7862″[1]
Apparent magnitude (V) 6.32±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type G8 III[3]
B−V color index +0.94[4]
Astrometry
Radial velocity (Rv)0±0.4[5] km/s
Proper motion (μ) RA: −30.210 mas/yr[1]
Dec.: −8.448 mas/yr[1]
Parallax (π)7.0190 ± 0.0167 mas[1]
Distance465 ± 1 ly
(142.5 ± 0.3 pc)
Absolute magnitude (MV)+0.61[6]
Details[7]
Mass2.32±0.13 M☉
Radius9.96±0.15 R☉
Luminosity58.3±1.0 L☉
Surface gravity (log g)2.78±0.06 cgs
Temperature5,055±32 K
Metallicity [Fe/H]−0.02±0.03 dex
Rotational velocity (v sin i)1.6±1.2[8] km/s
Age619[1] Myr
Other designations
56 G. Antliae[9], CD−39°6225, CPD−39°4270, HD 88836, HIP 50122, HR 4019, SAO 221883, WDS J10139-4019A[10]
Database references
SIMBADdata

HD 88836 has a stellar classification of G8 III,[3] indicating that it is an evolved red giant. Gaia Data Release 3 stellar evolution models place it on the red giant branch.[1] At present it has 2.3 times the mass of the Sun but has expanded to 10 times its girth.[7] It shines with a luminosity of 58.3 L☉ from its enlarged photosphere at an effective temperature of 5,055 K.[7] HD 88836 metallicity – what astronomers dub as a star's abundance of elements heavier than helium – is around solar level.[7] Like most giants, the object spins slowly, having a projected rotational velocity of 1.6 km/s.[8]

There is a 13th magnitude companion located 10.9″ away along a position angle of 209°,[11] which was first noticed by R.A. Rossiter in 1912. It is unknown if its physically related to HD 88836 or not, although its Gaia Data Release 3 parallax is much smaller than HD 88836's.[12]

References
  1. 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.
  2. 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.
  3. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  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. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  6. 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 119257644.
  7. Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. eISSN 1432-0746. ISSN 0004-6361.
  8. 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". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
  9. 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.
  10. "HR 4019". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 29, 2022.
  11. 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.
  12. 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.
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