Astronomy:Gamma Sculptoris

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Short description: Solitary orange-hued star in the constellation Sculptor
γ Sculptoris
Sculptor constellation map.svg
Red circle.svg
Location of γ Sculptoris (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sculptor
Right ascension  23h 18m 49.44076s[1]
Declination −32° 31′ 55.2890″[1]
Apparent magnitude (V) 4.41[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.06[4]
B−V color index +1.13[4]
Astrometry
Radial velocity (Rv)+15.60[5] km/s
Proper motion (μ) RA: +20.13[1] mas/yr
Dec.: −77.72[1] mas/yr
Parallax (π)17.90 ± 0.19[1] mas
Distance182 ± 2 ly
(55.9 ± 0.6 pc)
Absolute magnitude (MV)0.67[2]
Details
Mass1.60[6] M☉
Radius12[7] R☉
Luminosity72.41[2] L☉
Surface gravity (log g)2.45[6] cgs
Temperature4,578±24[8] K
Metallicity [Fe/H]−0.06[6] dex
Rotational velocity (v sin i)1.7[9] km/s
Age2.47[8] Gyr
Other designations
γ Scl, CD−33° 16476, FK5 879, GC 32450, GJ 9821, HD 219784, HIP 115102, HR 8863, SAO 214444, GSC 07510-01089[10]
Database references
SIMBADdata

Gamma Sculptoris, Latinized from γ Sculptoris, is a single,[11] orange-hued star in the constellation Sculptor. Based upon an annual parallax shift of 17.90 mas as seen from Earth,[1] this star is located about 182 light years from the Sun. It is bright enough to be visible to the naked eye with an apparent visual magnitude of 4.41.[2] It is moving away from the Sun with a radial velocity of +15.6 km/s.[5]

This is an evolved K-type giant star with a stellar classification of K1 III.[3] At the age of 2.47[8] billion years it is a red clump star on the horizontal branch,[6] which means it is generating energy through helium fusion at its core. The star has 1.60[6] times the mass of the Sun and it has expanded to 12[7] times the Sun's radius. It is radiating 72[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,578 K[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (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.  Vizier catalog entry
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  3. ↑ 3.0 3.1 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H. 
  4. ↑ 4.0 4.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
  5. ↑ 5.0 5.1 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). ISBN 9780598216885. Bibcode: 1953GCRV..C......0W. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzynski, G.; Gieren, W. (2007). "The abundances of nearby red clump giants". Monthly Notices of the Royal Astronomical Society 382 (2): 553. doi:10.1111/j.1365-2966.2007.11852.x. Bibcode: 2007MNRAS.382..553L. 
  7. ↑ 7.0 7.1 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A.  Vizier catalog entry
  8. ↑ 8.0 8.1 8.2 8.3 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L. Vizier catalog entry
  9. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.  Vizier catalog entry
  10. ↑ "gam Scl". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=gam+Scl. 
  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. 



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