R Muscae
{{Short description|Variable star in the constellation Musca}}
{{Starbox begin
| name = R Muscae
}}
{{Starbox image
| image = 250px
| caption = Hubble Space Telescope image of R Muscae
}}
{{Starbox observe
| epoch = J2000
| constell = Musca
| dec = {{DEC|-69|24|27.1966}}
}}
{{Starbox character
| type =
| class = F7 Ib - G2
| u-b =
| variable = δ Cep
}}
{{Starbox astrometry
| parallax = 1.0002
| p_error = 0.0291
}}
{{Starbox detail
| source =
| mass =
| temperature = {{Val|5985|54|fmt=commas}}
| metal_fe = {{Val|+0.10|0.05}}
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names={{odlist | V=R Mus | CD=−68°1119 | HD=110311 | HIP=61981 | HR=4820 | SAO=251996 | AAVSO=1236-68 }}
}}
{{Starbox reference
| Simbad = R+Mus
}}
{{Starbox end}}
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, 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 {{Val|1.00|ul=mas}}, is around 3,260 light years.
This is an F-type supergiant star with a baseline stellar classification of F7 Ib. It is a Classical Cepheid variable ranging from apparent magnitude 5.93 to 6.73 over 7.51 days, while varying between spectral types F7 Ib and G2. The star was suspected of having a detectable companion, but this finding was later disputed. Gaia and HST observations have shown that there is a companion, a 15th-magnitude star {{val|7|ul="}} away. There is an X-ray source with a luminosity of {{Val|6.3e29|u=erg s−1}} located at an angular separation of {{Val|1.9|ul=arcsecond}} from R Muscae.
File:RMusLightCurve.png for R Muscae, plotted from TESS data]]
References
{{reflist|refs=
{{cite simbad | title=DU Lyncis | access-date=3 September 2018 }}
| title=Cepheid binaries. II. New southern examples
| last1=Lloyd Evans | first1=T.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=199 | issue=4 | pages=925–941 | date=June 1982
| doi=10.1093/mnras/199.4.925 | bibcode=1982MNRAS.199..925L | doi-access=free }}
| title=UV, optical and IR observations of the Cepheid R MUSCAE
| display-authors=1 | last1=Eichendorf | first1=W.
| last2=Heck | first2=A. | last3=Caccin | first3=B.
| last4=Russo | first4=G. | last5=Sollazzo | first5=C.
| journal=Astronomy and Astrophysics
| volume=109 | issue=2 | date=May 1982 | pages=274–278
| bibcode=1982A&A...109..274E }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| title=General catalogue of variable stars: Version GCVS 5.1
| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V
| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N
| last5=Pastukhova | first5=E. N | journal=Astronomy Reports
| volume=61 | issue=1 | pages=80 | year=2017
| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}
| title=R Muscae | last=BSJ
| date=4 January 2010 | work=AAVSO Website
| publisher=American Association of Variable Star Observers
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=19677
| accessdate=21 December 2013 }}
| last1=Houk | first1=Nancy | last2=Cowley | first2=A. P.
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| location=Ann Arbor, Michigan
| publisher=Dept. of Astronomy, University of Michigan
| year=1979 | volume=1 | bibcode=1978mcts.book.....H }}
| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.
| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
| journal=Astronomy & Astrophysics
| volume=546 | id=A61 | pages=14 | date=October 2012
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| arxiv=1208.3048 | s2cid=59451347 }}
| last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François
| last3=Brouillet | first3=Nathalie | last4=Chemin | first4=Laurent
| title=The PASTEL catalogue: 2016 version
| journal=Astronomy & Astrophysics | display-authors=1
| volume=591 | pages=A118 | year=2016
| doi=10.1051/0004-6361/201628497
| bibcode=2016A&A...591A.118S | arxiv=1605.07384 | s2cid=119258214 }}
| title=The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids
| display-authors=1 | last1=Luck | first1=R. E.
| last2=Andrievsky | first2=S. M. | last3=Kovtyukh | first3=V. V.
| last4=Gieren | first4=W. | last5=Graczyk | first5=D.
| journal=The Astronomical Journal
| volume=142 | issue=2 | id=51 | pages=12 | date=August 2011
| doi=10.1088/0004-6256/142/2/51 | bibcode=2011AJ....142...51L
| arxiv=1106.0182 | s2cid=119288363 }}
| title=Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations
| last1=Evans | first1=Nancy Remage | last2=Pillitteri | first2=Ignazio
| last3=Wolk | first3=Scott | last4=Karovska | first4=Margarita
| last5=Tingle | first5=Evan | last6=Guinan | first6=Edward
| last7=Engle | first7=Scott | last8=Bond | first8=Howard E.
| last9=Schaefer | first9=Gail H. | last10=Mason | first10=Brian D.
| journal=The Astronomical Journal | display-authors=1
| volume=151 | issue=4 | id=108 | pages=9 | date=April 2016
| doi=10.3847/0004-6256/151/4/108 | bibcode=2016AJ....151..108E | arxiv=1602.01797 | s2cid=118500551 | doi-access=free }}
}}
{{Musca}}
{{DEFAULTSORT:R Muscae}}
Category:Classical Cepheid variables