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]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| 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 mas/yr[1] Dec.: +31.141 mas/yr[1] |
| Parallax (π) | 8.0957 ± 0.0795 mas[1] |
| 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 |
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
edit- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
- ^ a b 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.
- ^ a b 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.
- ^ a b 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. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
- ^ a b c d e 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. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
- ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b 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. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
- ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.
- ^ "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711.