S Muscae Explained

S Muscae is a classical (δ) Cepheid variable star in the constellation Musca about 2,600 light years away.

S Muscae is a yellow supergiant ranging between spectral types F6Ib and G0Ib and magnitudes 5.89 to 6.49 over a period of 9.66 days.[1] It is a luminous star around six times as massive as the Sun and 65.1 times the radius of the Sun. It is a binary star with a blue-white main sequence star companion likely to be of spectral type B3V to B5V with a mass of just over five solar masses,[2] one of the hottest and brightest companions of a Cepheid known. The two stars orbit each other every 505 days.[3]

S Muscae has been found to lie within the faint star cluster ASCC 69.[4]

Notes and References

  1. 2009yCat....102025S. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. etal. Samus. N. N.. Durlevich. O. V.. 2009.
  2. 4. 1997ApJ...477..916B. 10.1086/303725. The Mass of the Classical Cepheid S Muscae. The Astrophysical Journal. 477. 2. 916. 1997. Bohm-Vitense. Erika. Remage Evans. Nancy. Carpenter. Kenneth. Beck-Winchatz. Bernhard. Robinson. Richard. free.
  3. 1990PASP..102..551E. 10.1086/132668. The orbit and colors of the Cepheid S MUSCAE. Publications of the Astronomical Society of the Pacific. 102. 551. 1990. Evans. Nancy Remage. free.
  4. 2014ApJ...785L..25E. 1403.6939. X-Ray Detection of the Cluster Containing the Cepheid S Mus. The Astrophysical Journal Letters. 785. 2. L25. Remage Evans. Nancy. Pillitteri. Ignazio. Wolk. Scott. Guinan. Edward. Engle. Scott. Bond. Howard E.. Schaefer. Gail H.. Karovska. Margarita. Depasquale. Joseph. Tingle. Evan. 2014. 10.1088/2041-8205/785/2/L25. 119113620.

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