HD 85725

HD 85725
Observation data
Epoch J2000      Equinox ICRS
Constellation Antlia
Right ascension 09h 52m 58.02763s
Declination −27° 19′ 55.8219″
Apparent magnitude (V) 6.28
Characteristics
Evolutionary stage subgiant
Spectral type G1 V
B−V color index +0.62
Astrometry
Radial velocity (Rv)61.6±0.1 km/s
Proper motion (μ) RA: −278.245 mas/yr
Dec.: +95.043 mas/yr
Parallax (π)18.5634±0.0256 mas
Distance175.7 ± 0.2 ly
(53.87 ± 0.07 pc)
Absolute magnitude (MV)+2.68
Details
Mass1.42 M☉
Radius2.59±0.11 R☉
Luminosity7.58 L☉
Surface gravity (log g)3.86 cgs
Temperature5,940±110 K
Metallicity [Fe/H]+0.15 dex
Rotational velocity (v sin i)5.9±0.3 km/s
Age2.75 Gyr
Other designations
33 G. Antliae, CD−26°7505, CPD−26°4079, HIP 48468, HR 3916, SAO 178130, WDS J09530-2720A
Database references
SIMBADdata

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, placing it near the limit for naked eye visibility. The object is relatively close at a distance of 176 light-years, but is receding with a heliocentric radial velocity of 61.6 km/s.

HD 85725 has a stellar classification of G1 V, 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 and evolutionary models indicate that is an evolved subgiant.

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

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.

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.