Astronomy:1 Arietis

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Short description: Double star in the constellation Aries
1 Arietis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries
Right ascension  01h 50m 08.56984s[1]
Declination +22° 16′ 31.2100″[1]
Apparent magnitude (V) 5.86[2] (6.4/7.2)[3]
Characteristics
Spectral type K1 III + A6 V[3]
U−B color index +0.5[2]
B−V color index +0.74[2]
Astrometry
Radial velocity (Rv)6.95±0.13[4] km/s
Proper motion (μ) RA: –16.52[1] mas/yr
Dec.: –8.25[1] mas/yr
Parallax (π)5.57 ± 0.75[1] mas
Distanceapprox. 590 ly
(approx. 180 pc)
Absolute magnitude (MV)−0.39[4]
Details
Luminosity141.51[4] L☉
Other designations
1 Ari, BD+21°243, HIP 8544, HR 530, SAO 74966, ADS 1457, WDS J01501+2217[5]
1 Ari A: HD 11154.
1 Ari B: HD 11155.
Database references
SIMBADdata

1 Arietis is a double star[3] in the northern constellation of Aries. 1 Arietis is the Flamsteed designation. The pair have a combined visual magnitude of 5.86,[2] making it faintly visible to the naked eye. Based upon an annual parallax shift of 5.57 mas,[1] the distance to the two stars is approximately 590 light-years (180 parsecs). As of 2016, the secondary had an angular separation of 2.90″ along a position angle of 165° from the primary.[6] They are moving further from the Earth with a heliocentric radial velocity of +7 km/s.[4]

The brighter star, designated component A, is a magnitude 6.40 giant star with a stellar classification of K1 III. The companion star, component B, is a magnitude 7.20 A-type main sequence star with a classification of A6 V.[3] Helmut Abt (1985) had this star classified as A3 IV,[7] matching a more evolved subgiant.

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. 
  2. ↑ 2.0 2.1 2.2 2.3 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series 34: 1–49. Bibcode: 1978A&AS...34....1N. 
  3. ↑ 3.0 3.1 3.2 3.3 Eggleton, P. P.; Tokovinin, A. A. (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. 
  4. ↑ 4.0 4.1 4.2 4.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ "* 1 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+1+Ari. 
  6. ↑ 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. 
  7. ↑ Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series 59: 95–112, doi:10.1086/191064, Bibcode: 1985ApJS...59...95A 

External links



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