HD 92845

In today's world, HD 92845 has become a topic of great interest to many people. Whether due to its historical relevance, its impact on current society or its influence in various areas, HD 92845 is a topic that leaves no one indifferent. Throughout history, HD 92845 has been the object of study, debate and reflection, and its importance remains valid today. In this article, we will explore different aspects related to HD 92845, analyzing its relevance and impact in the contemporary world.

HD 92845
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 42m 43.1844s[1]
Declination −32° 42′ 56.413″[1]
Apparent magnitude (V) 5.62±0.01[2]
Characteristics
Evolutionary stage subgiant[3]
Spectral type A0 V[4]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)4.5±0.5[6] km/s
Proper motion (μ) RA: −28.903 mas/yr[1]
Dec.: +1.262 mas/yr[1]
Parallax (π)4.1113±0.2655 mas[1]
Distance790 ± 50 ly
(240 ± 20 pc)
Absolute magnitude (MV)−0.67[7]
Details
Mass3.1±0.1[3] M☉
Radius5.31[8] R☉
Luminosity206+72
−53[3] L☉
Surface gravity (log g)3.5[9] cgs
Temperature9,376±109[8] K
Metallicity 0.00[10] dex
Rotational velocity (v sin i)81±3[11] km/s
Age282±34[12] Myr
Other designations
78 G. Antilae[13], CD−32°7572, CPD−32°2953, FK5 1277, GC 14732, HIP 52407, HR 4194, SAO 201665, WDS J10427-3243A[14]
Database references
SIMBADdata

HD 92845 (HR 4194) is a probable astrometric binary[15] in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocity of 4.5 km/s.

HD 92845 has a stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star. However, stellar evolution models from Zorec and Royer reveal it to be a subgiant that has just left the main sequence.[3] It has 3.1 times the mass of the Sun[3] but has expanded to an enlarged radius of 5.31 R☉.[8] It radiates with a luminosity 206 times greater than the Sun[3] from its photosphere at an effective temperature of 9,376 K,[8] giving a white hue. At an age of 282 million years,[12] HD 92845 spins quickly with a projected rotational velocity of 81 km/s.[11]

There is an optical companion 17″ away along a position angle of 214° as of 1999.[16]

References

  1. ^ a b c d 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. ^ 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. ^ a b c d e f Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
  4. ^ a b Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (July 1978). "Spectral classification from the ultraviolet line features of S2/68 spectra. III. Early A-type stars". Astronomy and Astrophysics Supplement Series. 33: 15–26. Bibcode:1978A&AS...33...15C. ISSN 0365-0138.
  5. ^ 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.
  6. ^ 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. ISSN 1063-7737. S2CID 119231169.
  7. ^ 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.
  8. ^ a b c d 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.
  9. ^ 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.
  10. ^ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108. S2CID 255201789.
  11. ^ a b Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 381 (1): 105–121. arXiv:astro-ph/0110490. Bibcode:2002A&A...381..105R. doi:10.1051/0004-6361:20011422. eISSN 1432-0746. ISSN 0004-6361.
  12. ^ a b Gerbaldi, M.; Faraggiana, R.; Burnage, R.; Delmas, F.; Gómez, A. E.; Grenier, S. (June 1999). "Search for reference A0 dwarf stars: Masses and luminosities revisited withHipparcos parallaxes". Astronomy and Astrophysics Supplement Series. 137 (2): 273–292. Bibcode:1999A&AS..137..273G. doi:10.1051/aas:1999248. eISSN 1286-4846. ISSN 0365-0138.
  13. ^ 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.
  14. ^ "HR 4194". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 15, 2022.
  15. ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711.
  16. ^ 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.