Astronomy:Mu1 Chamaeleontis
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Short description: Star in the constellation Chamaeleon
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 10h 00m 43.7937s[1] |
| Declination | −82° 12′ 52.8125″[1] |
| Apparent magnitude (V) | 5.53[2] |
| Characteristics | |
| Spectral type | A0 IV[3] |
| U−B color index | +0.05[4] |
| B−V color index | +0.03[4] |
| Astrometry | |
| Radial velocity (Rv) | 16±10[5] km/s |
| Proper motion (μ) | RA: −26.011[1] mas/yr Dec.: +31.141[1] mas/yr |
| Parallax (π) | 8.0957 ± 0.0795[1] mas |
| Distance | 403 ± 4 ly (124 ± 1 pc) |
| Absolute magnitude (MV) | +0.23[2] |
| Details | |
| Mass | 2.6[6] M☉ |
| Radius | 3.66[7] R☉ |
| Luminosity | 90.7[8] L☉ |
| Surface gravity (log g) | 3.73[6] cgs |
| Temperature | 10,141+157−240[9] K |
| Metallicity [Fe/H] | −0.18[6] dex |
| Rotational velocity (v sin i) | 150[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
μ1 Chamaeleontis, Latinized as Mu1 Chamaeleontis, is a single[12] star in the southern circumpolar constellation Chamaeleon. It is dimly visible to the naked eye with an apparent visual magnitude of 5.53.[2] Based upon parallax measurements, it is located approximately 403 light-years away from the Sun.[1] The radial velocity is poorly constrained, but it appears to be drifting further away at the rate of about 16 km/s[5]
This object has a stellar classification of A0 IV,[3] matching an A-type subgiant star. It has 2.6 times the mass of the Sun[6] and an effective temperature of 10,141 K,[9] giving a bluish white glow. Due to its slightly enlarged radius,[7] the star has a luminosity over 90 times that of the Sun[8] and spins rapidly with a projected rotational velocity of 150 km/s.[10] Mu1 Chamaeleontis' metallicity – elements heavier than helium – is 66% that of the Sun.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889–896. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K.
- ↑ 6.0 6.1 6.2 6.3 6.4 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K.
- ↑ 8.0 8.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M.
- ↑ 9.0 9.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 10.0 10.1 Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars.". The Astrophysical Journal 118: 285. doi:10.1086/145751. ISSN 0004-637X. Bibcode: 1953ApJ...118..285H.
- ↑ "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+Cha.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E.
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