Astronomy:Nu Tucanae

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Short description: Star in the constellation Tucana
Nu Tucanae
NuTucLightCurve.png
A light curve for Nu Tucanae, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Tucana
Right ascension  22h 33m 00.06240s[2]
Declination −61° 58′ 55.6390″[2]
Apparent magnitude (V) 4.75 - 4.93[3]
Characteristics
Spectral type M4 III[4]
U−B color index +1.73[5]
B−V color index +1.61[5]
Variable type Lb:[6]
Astrometry
Radial velocity (Rv)−3.4±0.8[7] km/s
Proper motion (μ) RA: −3.40[2] mas/yr
Dec.: −0.8[2] mas/yr
Parallax (π)11.24 ± 0.23[2] mas
Distance290 ± 6 ly
(89 ± 2 pc)
Absolute magnitude (MV)+0.16[8]
Details
Radius49.39+5.65
−7.73
[9] R
Luminosity400±11[9] L
Temperature3,674+326
−194
[9] K
Other designations
ν Tuc, CPD−62°6348, FK5 3803, HD 213442, HIP 111310, HR 8582, SAO 255247[10]
Database references
SIMBADdata

ν Tucanae, Latinized as Nu Tucanae, is a solitary,[11] variable star in the southern constellation of Tucana. This red-hued object is visible to the naked eye as a faint star with an apparent visual magnitude that fluctuates around +4.80.[5] It is located approximately 290 light years from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −3 km/s.[7]

This object is an aging red giant with a stellar classification of M4 III,[4] currently on the asymptotic giant branch.[6] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence; at present it has 49 times the Sun's radius.[9] It is classified as a slow irregular variable and its brightness varies from magnitude +4.75 to +4.93.[3] Cyclical periods of 22.3, 24.4, 24.8, 25.1, 25.5, 33.8, 50.6, 80.1, 123.2, and 261.8 days have been reported for its variations.[12] On average, the star is radiating around 400[9] times the luminosity of the Sun from its photosphere at an effective temperature of 3,674 K.[9]

References

  1. Hipparcos Tools Interactive Data Access, ESA, https://www.cosmos.esa.int/web/hipparcos/interactive-data-access, retrieved 8 December 2021. 
  2. Jump up to: 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V. 
  3. Jump up to: 3.0 3.1 Samus, N. N. et al. (2009), "General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1, Bibcode2009yCat....102025S. 
  4. Jump up to: 4.0 4.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode1978mcts.book.....H. 
  5. Jump up to: 5.0 5.1 5.2 Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa 23: 175, Bibcode1964MNSSA..23..175C. 
  6. Jump up to: 6.0 6.1 Sloan, G. C.; Price, S. D. (December 1998), "The Infrared Spectral Classification of Oxygen-rich Dust Shells", The Astrophysical Journal Supplement Series 119 (2): 141–158, doi:10.1086/313156, Bibcode1998ApJS..119..141S. 
  7. Jump up to: 7.0 7.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode2006AstL...32..759G. 
  8. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  9. Jump up to: 9.0 9.1 9.2 9.3 9.4 9.5 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. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. "nu Tuc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu+Tuc. 
  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, Bibcode2008MNRAS.389..869E. 
  12. "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society 400 (4): 1945, 2009, doi:10.1111/j.1365-2966.2009.15588.x, Bibcode2009MNRAS.400.1945T.