R Muscae

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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

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[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. ^ a b c d e f g h 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. ^ a b c 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. S2CID 125853869.
  3. ^ a b 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. ^ a b 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. S2CID 119257644.
  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. S2CID 59451347. A61.
  6. ^ a b c 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. S2CID 119288363. 51.
  7. ^ a b 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. S2CID 119258214.
  8. ^ "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 September 2018.
  9. ^ a b 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. S2CID 119226246.
  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. S2CID 118500551.
  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. S2CID 118500551. 108.
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