Astronomy:HD 125628
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Short description: Binary star system in the constellation Centaurus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 14h 22m 37.07301s[2] |
| Declination | −58° 27′ 32.8193″[2] |
| Apparent magnitude (V) | 4.76[1] (5.09 + 6.94)[3] |
| Characteristics | |
| A | |
| Evolutionary stage | giant[4] |
| Spectral type | G9III[3] |
| B−V color index | +0.795±0.003[1] |
| B | |
| Evolutionary stage | main sequence[5] |
| Spectral type | F5V[3] |
| B−V color index | +0.45[4] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +14.6±2.8[1] km/s |
| B | |
| Proper motion (μ) | RA: −39.763 mas/yr Dec.: +24.058 mas/yr |
| Parallax (π) | 13.0246 ± 0.0192[5] mas |
| Distance | 250.4 ± 0.4 ly (76.8 ± 0.1 pc) |
| Details | |
| A | |
| Mass | 2.9[6] M☉ |
| Radius | 12.3[6] R☉ |
| Surface gravity (log g) | 2.73[6] cgs |
| Temperature | 5,370[6] K |
| Rotational velocity (v sin i) | 5.5[4] km/s |
| Age | 3.6[4] Gyr |
| B | |
| Mass | 1.4[7] M☉ |
| Radius | 2.1[7] R☉ |
| Luminosity | 7.5[7] L☉ |
| Surface gravity (log g) | 3.95[7] cgs |
| Temperature | 6,642[7] K |
| Rotational velocity (v sin i) | 6.3[4] km/s |
| Age | 2.7[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 125628 is a binary star[3] system in the constellation Centaurus. It is faintly visible to the naked eye with a combined apparent visual magnitude of 4.76.[1] The distance to this system is approximately 380 light years based on parallax. It is drifting further away from the Sun with a radial velocity of +15 km/s.[1] The absolute magnitude is −0.55.[1]
The primary component of this system, component A, is an aging giant star with a stellar classification of G9III[3] and a visual magnitude of 5.09.[3] The secondary companion, designated component B, is a magnitude 6.94[3] star located at an angular separation of 9.10″ from the primary, along a position angle of 157°, as of 2016.[9] It is an F-type main-sequence star with a class of F5V.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Desidera, S. et al. (August 2006). "Spectroscopic characterization of a sample of southern visual binaries". Astronomy and Astrophysics 454 (2): 553–558. doi:10.1051/0004-6361:20064895. Bibcode: 2006A&A...454..553D.
- ↑ 5.0 5.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 6.0 6.1 6.2 6.3 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555. Bibcode: 1999A&A...352..555A.
- ↑ 7.0 7.1 7.2 7.3 7.4 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ "HD 125628". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125628.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
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