Epsilon Muscae

Epsilon Muscae

A light curve for Epsilon Muscae, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 17m 34.27716s[2]
Declination −67° 57′ 38.6486″[2]
Apparent magnitude (V) 4.0 - 4.3[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M5 III[5]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)7.1±0.7 km/s
Proper motion (μ) RA: −231.04±0.13[2] mas/yr
Dec.: −26.39±0.13[2] mas/yr
Parallax (π)10.82 ± 0.17 mas[2]
Distance301 ± 5 ly
(92 ± 1 pc)
Absolute magnitude (MV)−0.77[6]
Details
Mass<1.5-2[7] M☉
Radius~130[7] R☉
Luminosity1800-2300[7] L☉
Temperature3400[7] K
Other designations
eps Mus, CPD-67 1931, HD 106849, HIP 59929, HR 4671, SAO 251830.
Database references
SIMBADdata

Epsilon Muscae, Latinized as ε Muscae, is a red giant star of spectral type M5III in the constellation Musca.[5] Originally a main-sequence star of around 1.5 to 2 solar masses, it is now on the asymptotic giant branch[4] and has now expanded to 130 times the Sun's diameter and 1800 to 2300 its luminosity.[7] It is a semiregular variable, varying between visual magnitudes 4.0 and 4.3[3] in eight distinct periods ranging from a month to over half a year in length.[5] It is located around 300 light-years distant,[2] the same distance as the Lower Centaurus–Crux subgroup of the Scorpius–Centaurus association, although it is moving much faster at around 100 km/s and does not share a common origin.[7]

References

  1. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  3. ^ a b c Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 255195566.
  4. ^ a b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  5. ^ a b c Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–1961. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. S2CID 15358380.
  6. ^ 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.
  7. ^ a b c d e f Kaler, Jim. "Epsilon Muscae". Stars. University of Illinois. Retrieved 21 December 2013.