Astronomy:Rho Centauri
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 12h 11m 39.12805s[2] |
| Declination | −52° 22′ 06.4067″[2] |
| Apparent magnitude (V) | +3.97[1] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B3 V[3] |
| U−B color index | −0.650[4] |
| B−V color index | −0.156±0.008[1] |
| Astrometry | |
| Radial velocity (Rv) | +15.0±4.1[5] km/s |
| Proper motion (μ) | RA: −43.741[2] mas/yr Dec.: −11.771[2] mas/yr |
| Parallax (π) | 11.8348 ± 0.3746[2] mas |
| Distance | 276 ± 9 ly (84 ± 3 pc) |
| Absolute magnitude (MV) | −1.33[1] |
| Orbit[6] | |
| Primary | A |
| Companion | B |
| Period (P) | 3.626 yr |
| Semi-major axis (a) | 0.0440″ |
| Eccentricity (e) | 0.619 |
| Inclination (i) | 164° |
| Longitude of the node (Ω) | 225° |
| Periastron epoch (T) | 2019.237 |
| Argument of periastron (ω) (secondary) | 54° |
| Details | |
| A | |
| Mass | 5.413[7] M☉ |
| Radius | 3.8[8] R☉ |
| Luminosity | 810.42[1] L☉ |
| Surface gravity (log g) | 3.95[9] cgs |
| Temperature | 19,500[9] K |
| Rotational velocity (v sin i) | 147[10] km/s |
| Age | 23.7±1.4[11] Myr |
| B | |
| Mass | 3.583[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Centauri is a binary star[13] system in the southern constellation of Centaurus. Its name is a Bayer designation that is Latinized from ρ Centauri, and abbreviated Rho Cen or ρ Cen. This star is visible to the naked eye as a blue-white hued point of light with a combined apparent visual magnitude of +3.97.[1] The system is located approximately 276 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +15 km/s.[5] It is a proper motion member of the Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[3]
The primary component of this system is a B-type main-sequence star with a stellar classification of B3 V.[3] It is about 24[11] million years old with a high rate of spin, showing a projected rotational velocity of 147 km/s.[10] It has 5.4[7] times the mass of the Sun and 3.8[8] times the Sun's radius. The star is radiating 810[1] times the luminosity of the Sun from its photosphere at an effective temperature of 19,500 K.[9]
The secondary companion is 1.1 magnitudes fainter than the primary, with a projected separation of 5.68 astronomical unit|AU along a position angle of 19.72°, as of 2013.[13] It revolves around the primary star in 3.6 years, on an ecccentric orbit.[6] The mass is estimated at 3.6 times that of the Sun, or 66% that of the primary.[7]
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 2.2 2.3 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.
- ↑ 3.0 3.1 3.2 de Geus, E. J. et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1–2): 44–61, Bibcode: 1989A&A...216...44D
- ↑ Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement 15: 459, doi:10.1086/190168, Bibcode: 1968ApJS...15..459G.
- ↑ 5.0 5.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 Mason, Brian D. et al. (October 2023), "Speckle Interferometry at SOAR in 2022", The Astronomical Journal 166 (4): 139, doi:10.3847/1538-3881/acedaf, Bibcode: 2023AJ....166..139M.
- ↑ 7.0 7.1 7.2 7.3 Gratton, R. et al. (October 2023), "Multiples among B stars in the Scorpius-Centaurus association", Astronomy & Astrophysics 678: A93, doi:10.1051/0004-6361/202346806, Bibcode: 2023A&A...678A..93G. Vizier catalog entry
- ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 9.2 Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society 371 (1): 252–262, doi:10.1111/j.1365-2966.2006.10655.x, Bibcode: 2006MNRAS.371..252L.
- ↑ 10.0 10.1 Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.
- ↑ 11.0 11.1 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T
- ↑ "rho Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Cen.
- ↑ 13.0 13.1 Rizzuto, A. C. et al. (December 2013), "Long-baseline interferometric multiplicity survey of the Sco-Cen OB association", Monthly Notices of the Royal Astronomical Society 436 (2): 1694–1707, doi:10.1093/mnras/stt1690, Bibcode: 2013MNRAS.436.1694R.
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