R Muscae

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.

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
Radius65[1] R☉
Luminosity2,541[1] L☉
Surface gravity (log g)2.0±0.1[7] cgs
Temperature5,985±54[6] K
Metallicity [Fe/H]+0.10±0.05[7] dex
Other designations
R Mus, CD−68°1119, HD 110311, HIP 61981, HR 4820, SAO 251996[8]
Database references
SIMBADdata

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[9] over 7.51 days,[6] while varying between spectral types F7 Ib and G2.[9] The star was suspected of having a detectable companion,[10] but this finding was later disputed.[11] Gaia and HST observations have shown that there is a companion, a 15th-magnitude star 7″ away.[12][13] 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.[14]

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.
  2. 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. 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. 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. 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. 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.
  8. "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 September 2018.
  9. BSJ (4 January 2010). "R Muscae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013.
  10. Lloyd Evans, T. (June 1982). "Cepheid binaries. II. New southern examples". Monthly Notices of the Royal Astronomical Society. 199 (4): 925–941. Bibcode:1982MNRAS.199..925L. doi:10.1093/mnras/199.4.925.
  11. 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.
  12. Kervella, Pierre; Gallenne, Alexandre; Remage Evans, Nancy; Szabados, Laszlo; Arenou, Frédéric; Mérand, Antoine; Proto, Yann; Karczmarek, Paulina; Nardetto, Nicolas; Gieren, Wolfgang; Pietrzynski, Grzegorz (2019). "Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. I. Binarity from proper motion anomaly". Astronomy and Astrophysics. 623: A116. arXiv:1903.03632. Bibcode:2019A&A...623A.116K. doi:10.1051/0004-6361/201834210.
  13. Evans, Nancy Remage; Pillitteri, Ignazio; Wolk, Scott; Karovska, Margarita; Tingle, Evan; Guinan, Edward; Engle, Scott; Bond, Howard E.; Schaefer, Gail H.; Mason, Brian D. (2016). "Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations". The Astronomical Journal. 151 (4): 108. arXiv:1602.01797. Bibcode:2016AJ....151..108E. doi:10.3847/0004-6256/151/4/108.
  14. Evans, Nancy Remage; et al. (April 2016). "Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations". The Astronomical Journal. 151 (4): 9. arXiv:1602.01797. Bibcode:2016AJ....151..108E. doi:10.3847/0004-6256/151/4/108. 108.
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