Astronomy:Tau2 Aquarii

From HandWiki
Short description: Star in the constellation Aquarius


For other stars with this Bayer designation, see τ Aquarii.
τ2 Aquarii
Aquarius IAU.svg
Red circle.svg
Location of τ2 Aquarii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 49m 35.50157s[1]
Declination –13° 35′ 33.4767″[1]
Apparent magnitude (V) +4.042[2] (3.98 to 4.04)[3]
Characteristics
Spectral type K5 III[4] or M0 III[5]
U−B color index +1.948[2]
B−V color index +1.566[2]
Variable type Suspected[3]
Astrometry
Radial velocity (Rv)+1.0[6] km/s
Proper motion (μ) RA: –13.71[1] mas/yr
Dec.: –39.03[1] mas/yr
Parallax (π)10.27 ± 0.29[1] mas
Distance318 ± 9 ly
(97 ± 3 pc)
Absolute magnitude (MV)−1.28[7]
Details
Radius51.5+4.6
−5.5[8] R☉
Luminosity614±27[8] L☉
Surface gravity (log g)1.63[9] cgs
Temperature4,007+232
−166[8] K
Other designations
τ2 Aquarii, 71 Aquarii, NSV 14329, BD–14° 6354, FK5 861, HD 216032, HIP 112716, HR 8679, SAO 165321, WDS J22496-1336A[10]
Database references
SIMBADdata

Tau2 Aquarii, Latinized from τ2 Aquarii, is the Bayer designation for a single[11] star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +4.0.[2] Because the star lies near the ecliptic it is subject to occultations by the Moon.[12] The star is located at a distance of approximately 318 light years from the Sun based on parallax.[1]

This is an orange-hued[13] red giant star with a stellar classification of K5 III.[4] After exhausting the supply of hydrogen at its core, the aging star cooled and expanded off the main sequence. It now has 52 times the radius of the Sun and is radiating 614 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,007 K.[8] This is a suspected variable star with a brightness that has been measured ranging from visual magnitude 3.98 down to 4.04.[3]

A magnitude 9.94 visual companion to this star was reported by W. Herschel in 1782, and it has the modern discovery code 'H 6 97'. As of 2010, it was located at a wide angular separation of 132.40″ from the brighter star along a position angle of 297°.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina et al. (1966), "A System of photometric standards", Publ. Dept. Astron. Univ. Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17, Bibcode: 1966PDAUC...1....1G. 
  3. ↑ 3.0 3.1 3.2 Samus', N. N. et al. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S 
  4. ↑ 4.0 4.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  5. ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  6. ↑ Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W. 
  7. ↑ Pace, G. et al. (2003). "The Wilson-Bappu effect: A tool to determine stellar distances". Astronomy and Astrophysics 401 (3): 997–1008. doi:10.1051/0004-6361:20030163. Bibcode: 2003A&A...401..997P. 
  8. ↑ 8.0 8.1 8.2 8.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  9. ↑ Bordé, P. et al. (October 2002), "A catalogue of calibrator stars for long baseline stellar interferometry", Astronomy and Astrophysics 393: 183–193, doi:10.1051/0004-6361:20021020, Bibcode: 2002A&A...393..183B. 
  10. ↑ "tau Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau+Aqr. 
  11. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal 94: 751, doi:10.1086/114513, Bibcode: 1987AJ.....94..751W. 
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16. 
  14. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 

External links



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Tau2_Aquarii&oldid=3423391"