Astronomy:Sigma Arietis

From HandWiki
Short description: Star in the constellation Aries
σ Arietis
Location of σ Arietis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries[1]
Right ascension  02h 51m 29.586s[2]
Declination +15° 04′ 55.44″[2]
Apparent magnitude (V) +5.52[3]
Characteristics
Spectral type B7 V[4]
U−B color index −0.43[3]
B−V color index −0.09[3]
Astrometry
Radial velocity (Rv)+17±2[5] km/s
Proper motion (μ) RA: +29.636[2] mas/yr
Dec.: −24.650[2] mas/yr
Parallax (π)7.0519 ± 0.134[2] mas
Distance463 ± 9 ly
(142 ± 3 pc)
Absolute magnitude (MV)−0.38[1]
Details
A
Mass3.84±0.08[6] M☉
Radius3[7] R☉
Luminosity301[6] L☉
Surface gravity (log g)4.0±0.25[8] cgs
Temperature13,121[6] K
Rotational velocity (v sin i)165[6] km/s
Age36+57
−27[8] Myr
B
Mass1.0–1.2[8] M☉
Temperature5,524±150[8] K
Metallicity [Fe/H]−0.5[8] dex
Rotational velocity (v sin i)5 km/s
Other designations
σ Ari, 43 Arietis, BD+14 480, FK5 1079, GC 3427, HD 17769, HIP 13327, HR 847, SAO 93144, PPM 118608[9]
Database references
SIMBADdata

Sigma Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from σ Arietis, and abbreviated Sigma Ari or σ Ari. This star has an apparent visual magnitude of +5.52,[3] which is bright enough for the star to be seen with the naked eye from dark suburban skies. The star is located at a distance of approximately 463 light-years (142 parsecs) from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +17 km/s.[5] On November 20, 1952, it was observed being occulted by the planet Jupiter.[10]

Sigma Arietis is a B-type main sequence star with a stellar classification of B7 V.[4] This is a large star with three[7] times the radius of the Sun and 3.8[6] times the Sun's mass. It shines around 301[6] times as brightly as the Sun, with this energy being radiated into space from its outer atmosphere at an effective temperature of 13,121 K.[6] It is this heat that gives the star the blue-white hue of a B-type star. Sigma Arietis is spinning at a rapid clip, with a projected rotational velocity of 165 km/s.[6] It is about 36[8] million years old and is a probable member of the Cas-Tau OB association of stars that share a common motion through space.[11]

In 2016, a stellar companion was reported based on observations using adaptive optics with the Gemini North Telescope. This object has a mass equal to or slightly greater than the Sun. It has an effective temperature of 5,524 K.[8]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940.  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal 76: 1058, doi:10.1086/111220, Bibcode: 1971AJ.....76.1058C. 
  4. ↑ 4.0 4.1 Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement 17: 371, doi:10.1086/190179, Bibcode: 1968ApJS...17..371L. 
  5. ↑ 5.0 5.1 Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 5211–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 Gullikson, Kevin et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 13, doi:10.3847/0004-6256/152/2/40, 40, Bibcode: 2016AJ....152...40G. 
  9. ↑ "sig Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=sig+Ari. 
  10. ↑ Salanave, Leon E. (February 1953), "Occultation of Sigma ARIETIS by Jupiter", Publications of the Astronomical Society of the Pacific 65 (382): 48, doi:10.1086/126529, Bibcode: 1953PASP...65...48S. 
  11. ↑ de Zeeuw, P. T. et al. (January 1999), "A HIPPARCOS Census of the Nearby OB Associations", The Astronomical Journal 117 (1): 354–399, doi:10.1086/300682, Bibcode: 1999AJ....117..354D. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Sigma_Arietis&oldid=4133394"