R Muscae

R Muscae
Observation data
Epoch J2000      Equinox J2000
Constellation Musca
Right ascension 12h 42m 05.02561s[1]
Declination −69° 24′ 27.1966″[1]
Apparent magnitude (V) 5.93 - 6.73[2]
Characteristics
Spectral type F7 Ib[3] - G2[2]
B−V color index 0.750±0.020[4]
Variable type δ Cep[2]
Astrometry
Radial velocity (Rv)+3.8±2.9[5] km/s
Proper motion (μ) RA: −4.180[1] mas/yr
Dec.: −2.127[1] mas/yr
Parallax (π)1.0002 ± 0.0291[1] mas
Distance3,260 ± 90 ly
(1,000 ± 30 pc)
Absolute magnitude (MV)3.62[6]
Details
Radius~77[7] R☉
Surface gravity (log g)2.0±0.1[8] cgs
Temperature5,985±54[6] K
Metallicity [Fe/H]+0.10±0.05[8] dex
Other designations
R Mus, CD−68° 1119, HD 110311, HIP 61981, HR 4820, SAO 251996[9]
Database references
SIMBADdata

R Muscae is a yellow-white hued variable star in the southern constellation of Musca. It has a nominal apparent visual magnitude of 6.31,[4] which is near the lower limit of visibility to the naked eye. The distance to this star, as determined from its annual parallax shift of 1.00 mas,[1] is around 3,260 light years.

This is an F-type supergiant star with a baseline stellar classification of F7 Ib.[3] It is a Classical Cepheid variable ranging from apparent magnitude 5.93 to 6.73[10] over 7.51 days,[6] while varying between spectral types F7 Ib and G2.[10] The star was suspected of having a detectable companion,[11] but this finding was later disputed.[7] There is an X-ray source with a luminosity of 6.3×1029 erg s−1 located at an angular separation of 1.9″ from R Muscae.[12]

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 3 Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  3. 1 2 Houk, Nancy; Cowley, A. P. (1979). "Michigan catalogue of two-dimensional spectral types for the HD stars". 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  5. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. 1 2 3 Luck, R. E.; et al. (August 2011). "The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids". The Astronomical Journal. 142 (2): 12. arXiv:1106.0182. Bibcode:2011AJ....142...51L. doi:10.1088/0004-6256/142/2/51. 51.
  7. 1 2 Eichendorf, W.; et al. (May 1982). "UV, optical and IR observations of the Cepheid R MUSCAE". Astronomy and Astrophysics. 109 (2): 274–278. Bibcode:1982A&A...109..274E.
  8. 1 2 Soubiran, Caroline; et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  9. ↑ "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 September 2018.
  10. 1 2 BSJ (4 January 2010). "R Muscae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013.
  11. ↑ Lloyd Evans, T. (June 1982). "Cepheid binaries. II. New southern examples". Monthly Notices of the Royal Astronomical Society. 199: 925–941. Bibcode:1982MNRAS.199..925L. doi:10.1093/mnras/199.4.925.
  12. ↑ Evans, Nancy Remage; et al. (April 2016). "Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations". The Astronomical Journal. 151 (4): 9. Bibcode:2016AJ....151..108E. doi:10.3847/0004-6256/151/4/108. 108.
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