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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]

Mu Coronae Australis
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 mas[1]
Distance387 ± 9 ly
(119 ± 3 pc)
Absolute magnitude (MV)-0.37[4]
Details
Mass3.065[4] M☉
Radius11.38+0.60
−0.97[1] R☉
Luminosity111.22±2.95[1] L☉
Surface gravity (log g)3.48±0.12[5] cgs
Temperature5,557+151
−224[1] K
Metallicity [Fe/H]−0.15±0.04[5] dex
Rotational velocity (v sin i)7.7±10[3] km/s
Age361±66[4] Myr
Other designations
μ CrA, CD−40° 12807, FK5 3492, HD 173540, HIP 92226, HR 7050, SAO 229285[6]
Database references
SIMBADdata

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


  1. 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.
  2. 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.
  3. 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. S2CID 54046583.
  4. 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. S2CID 4811000.
  5. 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.
  6. "mu. CrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-24.{{cite web}}: CS1 maint: postscript (link)
  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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.

На других языках

- [en] Mu Coronae Australis

[ru] Мю Южной Короны

Мю Южной Короны (m CrA) — звезда в созвездии Южной Короны. Видимая звёздная величина +5.24 (видна невооружённым глазом). Это пульсирующая переменная звезда класса мирид.


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