Mu Coronae Australis
μ Coronae Australis, Latinized as Mu Coronae Australis, is a solitary[7] star located in the southern constellation of Corona Australis. It is a yellow-hued star and is visible to the naked eye with an apparent visual magnitude of 5.217.[2] Parallax measurements put it at a distance of approximately 387 light-years from the Sun, but it is drifting closer with a radial velocity of −16 km/s.[1] It has an absolute magnitude of -0.37.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 47m 44.61759s[1] |
| Declination | −40° 24′ 22.1955″[1] |
| Apparent magnitude (V) | 5.217[2] |
| Characteristics | |
| Spectral type | G5-6III[3] |
| B−V color index | +0.78[3] |
| Astrometry | |
| Radial velocity (Rv) | −15.94±0.14[1] km/s |
| Proper motion (μ) | RA: 23.815[1] mas/yr Dec.: -18.467[1] mas/yr |
| Parallax (π) | 8.4330 ± 0.1957[1] mas |
| Distance | 387 ± 9 ly (119 ± 3 pc) |
| Absolute magnitude (MV) | -0.37[4] |
| Details | |
| Mass | 3.065[4] M☉ |
| Radius | 11.38+0.60 −0.97[1] R☉ |
| Luminosity | 111.22±2.95[1] L☉ |
| Surface gravity (log g) | 3.48±0.12[5] cgs |
| Temperature | 5,557+151 −224[1] K |
| Metallicity [Fe/H] | −0.15±0.04[5] dex |
| Rotational velocity (v sin i) | 7.7±10[3] km/s |
| Age | 361±66[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an aging G-type giant star with a stellar classification of G5-6III.[3] It is roughly 361 million years old with 3.065 times the mass of the Sun.[4] Having exhausted the supply of hydrogen at its core, the star has cooled and expanded away from the main sequence. At present it has 11[1] times the girth of the Sun. The star is radiating 111[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,557 K.[1]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- De Medeiros, J. R.; et al. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
- Feltzing, S.; et al. (2001). "The solar neighbourhood age-metallicity relation - Does it exist?". Astronomy & Astrophysics. 377 (3): 911. arXiv:astro-ph/0108191. Bibcode:2001A&A...377..911F. doi:10.1051/0004-6361:20011119.
- Alves, S.; et al. (April 2015). "Determination of the spectroscopic stellar parameters for 257 field giant stars". Monthly Notices of the Royal Astronomical Society. 448 (3): 2749–2765. arXiv:1503.02556. Bibcode:2015MNRAS.448.2749A. doi:10.1093/mnras/stv189.
- "mu. CrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-24.
- 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
