Astronomy:Mu Coronae Australis

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Short description: Star in the constellation Corona Australis
μ Coronae Australis
Corona Australis constellation map.svg
Red circle.svg
Location of Mu CrA (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Corona Australis
Right ascension  18h 47m 44.61759s[1]
Declination −40° 24′ 22.1955″[1]
Apparent magnitude (V) 5.22±0.01[2]
Characteristics
Spectral type G5/6 III[3]
B−V color index +0.78[4]
Astrometry
Radial velocity (Rv)−18.2±0.8[5] km/s
Proper motion (μ) RA: +23.690[1] mas/yr
Dec.: −18.373[1] mas/yr
Parallax (π)8.4545 ± 0.0993[1] mas
Distance386 ± 5 ly
(118 ± 1 pc)
Absolute magnitude (MV)−0.22[6]
Details[7]
Mass3.07±0.11 M☉
Radius11.4±0.3 R☉
Luminosity104±5 L☉
Surface gravity (log g)3.15±0.08 cgs
Temperature5,448±27 K
Metallicity [Fe/H]−0.14±0.03 dex
Rotational velocity (v sin i)7.7±1[8] km/s
Age361±66[9] Myr
Other designations
μ CrA, CD−40°12807, CPD−40°8648, FK5 3492, GC 25722, HD 173540, HIP 92226, HR 7050, SAO 229285[10]
Database references
SIMBADdata

Mu Coronae Australis (Mu CrA), Latinized from μ Coronae Australis, is a solitary yellow-hued star[11] located in the southern constellation Corona Australis. It has an apparent magnitude of 5.22,[2] making it faintly visible to the naked eye. Gaia DR3 parallax measurements put it 386 light years away[1] and is currently approaching the Solar System with a heliocentric radial velocity of −18.2 km/s.[5] At its current distance, Mu CrA's brightness is diminished by 0.31 magnitudes due to interstellar dust.[12] It has an absolute magnitude of −0.22.[6]

Mu CrA has a stellar classification of G5/6 III,[3] indicating that it is an evolved G-type star with the characteristics of a G5 and G6 giant star. At an age of 365 million years,[9] the star has exhausted the supply of hydrogen at its core and has expanded to 11.4 times the radius of the Sun. At present it has 3.07 times the mass of the Sun and radiates 104 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,448 K. Mu CrA is slightly metal deficent and spins modestly with a projected rotational velocity of 7.7 km/s.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40°. Bibcode: 1978mcts.book.....H. 
  4. ↑ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O. 
  8. ↑ 8.0 8.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  9. ↑ 9.0 9.1 Feltzing, S.; Holmberg, J.; Hurley, J. R. (October 2001). "The solar neighbourhood age-metallicity relation - Does it exist?". Astronomy & Astrophysics 377 (3): 911–924. doi:10.1051/0004-6361:20011119. ISSN 0004-6361. Bibcode: 2001A&A...377..911F. 
  10. ↑ "mu. CrA". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+CrA. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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