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,[2] placing it near the limit for naked eye visibility. The object is relatively close at a distance of 176 light-years,[1] but is receding with a heliocentric radial velocity of 61.6 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 09h 52m 58.02763s[1] |
| Declination | −27° 19′ 55.8219″[1] |
| Apparent magnitude (V) | 6.28[2] |
| Characteristics | |
| 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[1] Dec.: +95.043 mas/yr[1] |
| Parallax (π) | 18.5634 ± 0.0256 mas |
| Distance | 175.7 ± 0.2 ly (53.87 ± 0.07 pc) |
| Absolute magnitude (MV) | +2.68[2] |
| 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 | |
| Database references | |
| SIMBAD | data |
HD 85725 has a stellar classification of G1 V,[3] which indicates that it is an ordinary G-type main-sequence star that is fusing hydrogen at its core. However, a low surface gravity of 7244 cm/s2[9] suggests that the object is instead an evolved subgiant.
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
edit- ^ 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.
- ^ a b c 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. ISSN 1063-7737. S2CID 255204555.
- ^ a b 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.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b 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.
- ^ a b c d "BaSTI Home Page". basti.oa-abruzzo.inaf.it.
- ^ 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. eISSN 1538-3881.
- ^ a b 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.
- ^ a b 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.
- ^ 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.
- ^ a b 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.
- ^ "HD 85725". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2017.
- ^ 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.