HD 85725

Last updated
HD 85725
Observation data
Epoch J2000       Equinox J2000
Constellation Antlia [1]
Right ascension 09h 52m 58.02763s [2]
Declination −27° 19′ 55.8219″ [2]
Apparent magnitude  (V)6.28 [1]
Characteristics
Evolutionary stage subgiant [2]
Spectral type G1 V [3]
B−V color index +0.62 [4]
Astrometry
Radial velocity (Rv)61.6±0.1 [5] km/s
Proper motion (μ)RA: −278.245 mas/yr [2]
Dec.: +95.043 mas/yr [2]
Parallax (π)18.5634±0.0256  mas [2]
Distance 175.7 ± 0.2  ly
(53.87 ± 0.07  pc)
Absolute magnitude  (MV)+2.68 [1]
Details
Mass 1.42 [6]   M☉
Radius 2.59±0.11 [7]   R☉
Luminosity 7.58 [8]   L☉
Surface gravity (log g)3.86 [9]   cgs
Temperature 5,940±110 [7]   K
Metallicity [Fe/H]+0.15 [10]   dex
Rotational velocity (v sin i)5.9±0.3 [11]  km/s
Age 2.75 [6]   Gyr
Other designations
33 G. Antliae, CD−26°7505, CPD−26°4079, HIP 48468, HR 3916, SAO 178130, WDS J09530-2720A [12]
Database references
SIMBAD data

HD 85725, also known as HR 3916, is a yellow hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.29, [1] placing it near the limit for naked eye visibility. The object is relatively close at a distance of 176 light-years, [2] but is receding with a heliocentric radial velocity of 61.6  km/s . [5]

HD 85725 has a stellar classification of G1 V, [3] which suggests that it is an ordinary G-type main-sequence star that is fusing hydrogen at its core. However, a low surface gravity of 7,244  cm/s2 [9] and evolutionary models indicate that is an evolved subgiant. [2]

At present it has 143% [6] the mass of the Sun but is 2.59 times larger, [7] which is not characteristic of a yellow dwarf. It shines at 7.6 [8] times the luminosity of the Sun from its photosphere at a surface temperature of 5,940 K, [7] which gives it a yellow glow. At an age of 2.75 billion years, [6] HD 85725 is spinning leisurely with a projected rotational velocity of 5.9  km/s . [11]

There is a 10th magnitude companion located 1.5″ away along a position angle of 25° . It appears to have a common proper motion with the star, suggesting physical relation. [13]

References

  1. 1 2 3 4 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
  4. ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. 1 2 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. 1 2 3 4 "BaSTI Home Page". basti.oa-abruzzo.inaf.it.
  7. 1 2 3 4 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 . eISSN   1538-3881.
  8. 1 2 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (October 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 . ISSN   0035-8711.
  9. 1 2 Costa Silva, A. R.; Delgado Mena, E.; Tsantaki, M. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy and Astrophysics. 634: A136. arXiv: 1912.08659 . Bibcode:2020A&A...634A.136C. doi: 10.1051/0004-6361/201936523 . ISSN   0004-6361.
  10. ↑ Delgado Mena, E.; Adibekyan, V.; Santos, N. C.; Tsantaki, M.; González Hernández, J. I.; Sousa, S. G.; Bertrán de Lis, S. (November 2021). "Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program". Astronomy & Astrophysics. 655: A99. arXiv: 2109.04844 . Bibcode:2021A&A...655A..99D. doi:10.1051/0004-6361/202141588. eISSN   1432-0746. ISSN   0004-6361. S2CID   237485512.
  11. 1 2 Saar, S. H.; Osten, R. A. (1 February 1997). "Rotation, turbulence and evidence for magnetic fields in southern dwarfs". Monthly Notices of the Royal Astronomical Society. 284 (4): 803–810. Bibcode:1997MNRAS.284..803S. doi: 10.1093/mnras/284.4.803 . eISSN   1365-2966. ISSN   0035-8711.
  12. ↑ "HD 85725". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 22 August 2017.
  13. ↑ 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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