Astronomy:54 Arietis

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Short description: Star in the constellation Aries
54 Arietis
54AriLightCurve.png
A light curve for 54 Arietis, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries
Right ascension  03h 08m 21.10890s[2]
Declination +18° 47′ 42.1886″[2]
Apparent magnitude (V) 6.27[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M0 III[5]
B−V color index 1.560±0.014[6]
Astrometry
Radial velocity (Rv)+44.32±0.22[2] km/s
Proper motion (μ) RA: +38.133[2] mas/yr
Dec.: −14.295[2] mas/yr
Parallax (π)4.3947 ± 0.1037[2] mas
Distance740 ± 20 ly
(228 ± 5 pc)
Absolute magnitude (MV)−0.54[6]
Details
Radius40.7+3.0
−2.6[2] R☉
Luminosity387±11[2] L☉
Temperature4013+137
−141[2] K
Other designations
54 Ari, BD+18°414, FK5 4285, GC 3742, HD 19460, HIP 14586, HR 940, SAO 93293[7]
Database references
SIMBADdata

54 Arietis is a star in the northern zodiac constellation of Aries. 54 Arietis is the Flamsteed designation. It is a challenge to view with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.27.[3] Based upon an annual parallax shift of 4.39 mas, it is located approximately 740 light-years (230 parsecs) distant from Earth, and it is drifting further away with a radial velocity of +44 km/s.[2] The brightness of the star is diminished by 0.15[8] in magnitude from extinction caused by interstellar gas and dust. The star is positioned near the ecliptic and thus is subject to lunar occultations.[9]

This is an aging red giant star with a stellar classification of M0 III[5] that is currently evolving along the asymptotic giant branch.[4] Having exhausted the supply of hydrogen at its core, the star has expanded to 41[2] times the Sun's radius. It varies slightly in brightness, with a periodicity of 6.2 days and an amplitude change of 0.0096 in magnitude.[5] On average it is radiating 387[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,013 K.[2]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 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.
  3. ↑ 3.0 3.1 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society 133 (4): 475–493, doi:10.1093/mnras/133.4.475, Bibcode: 1966MNRAS.133..475A. 
  4. ↑ 4.0 4.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E. 
  5. ↑ 5.0 5.1 5.2 Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society 331 (1): 45–59, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ "54 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=54+Ari. 
  8. ↑ Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430: 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F. 
  9. ↑ Eitter, J. J.; Beavers, W. I. (June 1979), "Lunar occultation summary. III", Astrophysical Journal Supplement Series 40: 475–486, doi:10.1086/190595, Bibcode: 1979ApJS...40..475E.  See event #419 for example.

External links



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