Nu Caeli

Nu Caeli (ν Caeli) is a yellow-white hued star in the constellation Caelum. It has an apparent visual magnitude of 6.07,[2] which indicates it is near the lower limit on brightness that is visible to the naked eye. According to the Bortle scale, the star can be viewed from dark suburban skies. Based upon an annual parallax shift of 19.03 mas as seen from Earth,[1] this star is located about 171 light years from the Sun.

Nu Caeli
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension  04h 50m 16.18081s[1]
Declination −41° 19′ 15.0550″[1]
Apparent magnitude (V) 6.07[2]
Characteristics
Spectral type F2/3 V[3] or F1 III-IV[4]
B−V color index +0.37[2]
Astrometry
Radial velocity (Rv)+23.8±0.8[5] km/s
Proper motion (μ) RA: −3.11[1] mas/yr
Dec.: +66.37[1] mas/yr
Parallax (π)19.03 ± 0.32[1] mas
Distance171 ± 3 ly
(52.5 ± 0.9 pc)
Absolute magnitude (MV)+2.46[6]
Details
Mass1.34[7] M☉
Luminosity8.25[8] L☉
Surface gravity (log g)4.20±0.14[7] cgs
Temperature6,870±234[7] K
Metallicity [Fe/H]−0.11[9] dex
Age880[7] Myr
Other designations
ν Cae, CD−41° 1593, GC 5913, HD 30985, HIP 22488, HR 1557, SAO 217032, CCDM 04503-4119[10]
Database references
SIMBADdata

Houk (1978) listed a stellar classification of F2/3 V for Nu Caeli,[3] which would indicate this is an F-type main-sequence star.[3] In contrast, Malaroda (1975) assigned in to class F1 III-IV,[4] which would suggest it is a more evolved F-type subgiant/giant transitional hydrid. It is an estimated 880 million years old with 1.34 times the mass of the Sun.[7] The star is radiating eight[8] times the Sun's luminosity from its photosphere at an effective temperature of 6,870 K.[7]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. Malaroda, S. (August 1975), "Study of the F-type stars. I. MK spectral types", Astronomical Journal, 80: 637–641, Bibcode:1975AJ.....80..637M, doi:10.1086/111786.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
  7. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  8. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  9. Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  10. "HD 30985". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.