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Epsilon Muscae, Latinized as ε Muscae, is a red giant star of spectral type M5III in the constellation Musca.[3] Originally a main-sequence star of around 1.5 to 2 solar masses, it is now on the asymptotic giant branch[2] and has now expanded to 130 times the Sun's diameter and 1800 to 2300 its luminosity.[5] It is a semiregular variable, varying in eight distinct periods ranging from a month to over half a year in length, with the largest amplitude being of almost half a magnitude from the mean of 4.06.[3] It is located around 300 light-years distant,[1] 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.[5]

Epsilon Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 17m 34.27716s[1]
Declination −67° 57′ 38.6486″[1]
Apparent magnitude (V) 4.06v
Characteristics
Evolutionary stage asymptotic giant branch[2]
Spectral type M5 III[3]
Astrometry
Radial velocity (Rv)7.1±0.7 km/s
Proper motion (μ) RA: −231.04±0.13[1] mas/yr
Dec.: −26.39±0.13[1] mas/yr
Parallax (π)10.82 ± 0.17 mas[1]
Distance301 ± 5 ly
(92 ± 1 pc)
Absolute magnitude (MV)−0.77[4]
Other designations
eps Mus, CPD-67 1931, HD 106849, HIP 59929, HR 4671, SAO 251830.
Database references
SIMBADdata

References


  1. 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
  2. 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.
  3. 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.
  4. 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.
  5. Kaler, Jim. "Epsilon Muscae". Stars. University of Illinois. Retrieved 21 December 2013.

На других языках

- [en] Epsilon Muscae

[es] Épsilon Muscae

Épsilon Muscae (ε Mus / HD 106849 / HR 4671)[1][2] es un estrella en la constelación de Musca, la mosca. De magnitud aparente +4,06, se encuentra a 302 años luz de distancia del Sistema Solar. Aunque esta distancia es aproximadamente la misma que nos separa de α Muscae, β Muscae y γ Muscae —las tres estrellas calientes azules y miembros de la asociación estelar Centaurus-Crux—, Épsilon Muscae se mueve a una velocidad mucho mayor que ellas, por lo que no está relacionada con las otras tres estrellas de la constelación. Su velocidad en relación al Sol es de unos 100 km/s, unas cinco o seis veces mayor de lo normal.[3]


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