Astronomy:Epsilon Muscae
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Short description: Variable star in the constellation Musca
| Observation data 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[2] mas |
| Distance | 301 ± 5 ly (92 ± 1 pc) |
| Absolute magnitude (MV) | −0.77[6] |
| Details | |
| Mass | <1.5-2[7] M☉ |
| Radius | ~130[7] R☉ |
| Luminosity | 1800-2300[7] L☉ |
| Temperature | 3400[7] K |
| Other designations | |
eps Mus, CPD-67 1931, HD 106849, HIP 59929, HR 4671, SAO 251830. | |
| Database references | |
| SIMBAD | data |
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
- ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 4.0 4.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 5.0 5.1 5.2 "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961. 2009. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 "Error: no
|title=specified when using {{Cite web}}". Stars. University of Illinois. http://stars.astro.illinois.edu/sow/epsmus.html. Retrieved 21 December 2013.
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