Astronomy:R Muscae

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Short description: Variable star in the constellation Musca
R Muscae
RMusLightCurve.png
A light curve for R Muscae, plotted from TESS data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Musca
Right ascension  12h 42m 05.02561s[2]
Declination −69° 24′ 27.1966″[2]
Apparent magnitude (V) 5.93 - 6.73[3]
Characteristics
Spectral type F7 Ib[4] - G2[3]
B−V color index 0.750±0.020[5]
Variable type δ Cep[3]
Astrometry
Radial velocity (Rv)+3.8±2.9[6] km/s
Proper motion (μ) RA: −4.180[2] mas/yr
Dec.: −2.127[2] mas/yr
Parallax (π)1.0002 ± 0.0291[2] mas
Distance3,260 ± 90 ly
(1,000 ± 30 pc)
Absolute magnitude (MV)-3.62[7]
Details
Radius65[2] R☉
Luminosity2,541[2] L☉
Surface gravity (log g)2.0±0.1[8] cgs
Temperature5,985±54[7] 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,[5] 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,[2] is around 3,260 light years.

This is an F-type supergiant star with a baseline stellar classification of F7 Ib.[4] It is a Classical Cepheid variable ranging from apparent magnitude 5.93 to 6.73[10] over 7.51 days,[7] 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.[12] Gaia and HST observations have shown that there is a companion, a 15th-magnitude star 7″ away.[13][14] 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.[15]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  4. ↑ 4.0 4.1 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. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  6. ↑ 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. doi:10.1051/0004-6361/201219219. A61. Bibcode: 2012A&A...546A..61D. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1088/0004-6256/142/2/51. 51. Bibcode: 2011AJ....142...51L. 
  8. ↑ 8.0 8.1 Soubiran, Caroline et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S. 
  9. ↑ "DU Lyncis". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=DU+Lyncis. 
  10. ↑ 10.0 10.1 BSJ (4 January 2010). "R Muscae". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=19677. Retrieved 21 December 2013. 
  11. ↑ Lloyd Evans, T. (June 1982). "Cepheid binaries. II. New southern examples". Monthly Notices of the Royal Astronomical Society 199 (4): 925–941. doi:10.1093/mnras/199.4.925. Bibcode: 1982MNRAS.199..925L. 
  12. ↑ 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. 
  13. ↑ Kervella, Pierre; Gallenne, Alexandre; Remage Evans, Nancy; Szabados, Laszlo; Arenou, Frédéric; Mérand, Antoine; Proto, Yann; Karczmarek, Paulina et al. (2019). "Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. I. Binarity from proper motion anomaly". Astronomy and Astrophysics 623: A116. doi:10.1051/0004-6361/201834210. Bibcode: 2019A&A...623A.116K. 
  14. ↑ Evans, Nancy Remage; Pillitteri, Ignazio; Wolk, Scott; Karovska, Margarita; Tingle, Evan; Guinan, Edward; Engle, Scott; Bond, Howard E. et al. (2016). "Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations". The Astronomical Journal 151 (4): 108. doi:10.3847/0004-6256/151/4/108. Bibcode: 2016AJ....151..108E. 
  15. ↑ Evans, Nancy Remage et al. (April 2016). "Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations". The Astronomical Journal 151 (4): 9. doi:10.3847/0004-6256/151/4/108. 108. Bibcode: 2016AJ....151..108E. 



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