R Muscae

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R Muscae

Hubble Space Telescope image of R Muscae [1]
Observation data
Epoch J2000      Equinox J2000
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 mas[2]
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, AAVSO 1236-68, 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]

A light curve for R Muscae, plotted from TESS data
A light curve for R Muscae, plotted from TESS data

References

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