Astronomy:Epsilon Muscae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Musca[1] |
| Right ascension | 12h 17m 34.27564s[2] |
| Declination | −67° 57′ 38.6525″[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[6] km/s |
| Proper motion (μ) | RA: −230.607±0.187[2] mas/yr Dec.: −26.206±0.263[2] mas/yr |
| Parallax (π) | 9.9915 ± 0.2[2] mas |
| Distance | 326 ± 7 ly (100 ± 2 pc) |
| Absolute magnitude (MV) | −0.77[1] |
| Details | |
| Mass | 2±0.3[7] M☉ |
| Radius | 116±9[7] R☉ |
| Luminosity | 1,738[2] L☉ |
| Surface gravity (log g) | 0.6±0.02[7] cgs |
| Temperature | 3,470±125[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Muscae, Latinized from ε Muscae, is a red giant star of spectral type M5III in the constellation Musca.[5] It is a 4th magnitude star, visible to the naked eye under good observing conditions. It is about 330 light-years from the Earth.[2]
Originally a main-sequence star of around 2 solar masses,[7] Epsilon Muscae is now on the asymptotic giant branch[4] and has expanded to 117 times the Sun's diameter and 1,700 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] Its distance from the Earth is about the same 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.[9]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 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.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Kallinger, T.; Beck, P. G.; Hekker, S.; Huber, D.; Kuschnig, R.; Rockenbauer, M.; Winter, P. M.; Weiss, W. W. et al. (2019-04-01). "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation" (in en). Astronomy & Astrophysics 624: A35. doi:10.1051/0004-6361/201834514. ISSN 0004-6361. Bibcode: 2019A&A...624A..35K.
- ↑ "/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.
- ↑ "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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