Nu Telescopii

Nu Telescopii (ν Telescopii) is a solitary,[8] white-hued star in the southern constellation of Telescopium. With an apparent visual magnitude of +5.35,[2] it is faintly visible to the naked eye. There is a faint magnitude 9.3 companion star at an angular separation of 102 arc seconds along a position angle of 333°, as of 2010.[9] The estimated distance to Nu Telescopii, based upon an annual parallax shift of 20.18 mas,[1] is about 162 light years.

Nu Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 48m 01.19882s[1]
Declination −56° 21′ 45.3958″[1]
Apparent magnitude (V) +5.35[2]
Characteristics
Spectral type A7 III–IV[3]
B−V color index +0.20[2]
Astrometry
Proper motion (μ) RA: +92.25[1] mas/yr
Dec.: −136.72[1] mas/yr
Parallax (π)20.18 ± 0.30[1] mas
Distance162 ± 2 ly
(49.6 ± 0.7 pc)
Absolute magnitude (MV)+1.86[4]
Details
Mass1.85[5] M☉
Radius2.109±0.078[6] R☉
Luminosity15.2[4] L☉
Surface gravity (log g)4.22[5] cgs
Temperature8,199±279[5] K
Age686[5] Myr
Other designations
ν Tel, CPD−56° 9290, FK5 739, HD 186543, HIP 97421, HR 7510, SAO 246271[7]
Database references
SIMBADdata

At the age of around 686 million years,[5] Nu Telescopii shows the spectral characteristics of an evolving A-type star with a stellar classification of A7 III–IV.[3] Here, the luminosity class of III–IV indicates mixed traits of a subgiant and a giant star. It has about 1.85[5] times the mass of the Sun and 2.1[6] times the Sun's radius. Based upon its motion through space, it is a candidate for membership in the IC 2391 supercluster.[10]

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, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  4. 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.
  5. 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.
  6. Masana, E.; et al. (2006), "Effective temperature scale and bolometric corrections from 2MASS photometry", Astronomy and Astrophysics, 450 (2): 735, arXiv:astro-ph/0601049, Bibcode:2006A&A...450..735M, doi:10.1051/0004-6361:20054021.
  7. "nu. Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-01.
  8. Eggleton, P. P.; Tokovinin, A. A. (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.
  9. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
  10. Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.