Mu1 Chamaeleontis

For other stars with this Bayer designation, see μ Chamaeleontis.
μ1 Chamaeleontis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 00m 43.7937s[1]
Declination −82° 12′ 52.812″[1]
Apparent magnitude (V) 5.53[2]
Characteristics
Evolutionary stage main sequence[1]
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]
Distance403 ± 4 ly
(124 ± 1 pc)
Absolute magnitude (MV)+0.23[2]
Details
Mass2.6[6] M☉
Radius3.66[7] R☉
Luminosity90.7[8] L☉
Surface gravity (log g)3.73[6] cgs
Temperature10,141+157
−240[9] K
Metallicity [Fe/H]−0.18[6] dex
Rotational velocity (v sin i)150[10] km/s
Other designations
μ1 Cha, CPD−81°399, FK5 3980, HD 87971, HIP 49065, HR 3983, SAO 258554[11]
Database references
SIMBADdata

Mu1 Chamaeleontis is a single[12] star in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from μ1 Chamaeleontis, and abbreviated Mu1 Cha or μ1 Cha. This star 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 (124 pc) 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] It is spinning rapidly with a projected rotational velocity of 150 km/s.[10] Mu1 Chamaeleontis' metallicity – elements more massive than helium – is 66% that of the Sun.[6]

References

  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c 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. XHIP record for this object at VizieR.
  3. ^ 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.
  4. ^ a b Johnson, H. L.; et al. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Kharchenko, N.V.; et al. (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.
  6. ^ 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.
  7. ^ a b Kervella, Pierre; et al. (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.
  8. ^ a b McDonald, I.; et al. (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.
  9. ^ 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.
  10. ^ 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.
  11. ^ "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg.
  12. ^ 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.

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