UX Arietis

UX Arietis is a triple star system located in the northern zodiacal constellation of Aries. Based upon parallax measurements from the Hipparcos satellite, it is roughly 168 light years away.[1] The primary, component Aa, is a variable star of the RS CVn type. The variability of the star is believed due to a combination of cool star spots and warm flares, set against the baseline quiescent temperature of the stellar atmosphere. The variability appears to be cyclical with a period of 8−9 years.[4]

UX Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 26m 35.38922s[1]
Declination +28° 42 54.3169[1]
Apparent magnitude (V) 6.47[2]
Characteristics
Spectral type G5IV[3]
U−B color index 0.43[2]
B−V color index 0.90[2]
Variable type RS CVn[4]
Astrometry
Radial velocity (Rv)+26.53[5] km/s
Proper motion (μ) RA: +41.65 mas/yr
Dec.: −104.03 mas/yr
Parallax (π)19.37 ± 0.70[1] mas
Distance168 ± 6 ly
(52 ± 2 pc)
Orbit[6]
Period (P)6.437888±0.000007 d
Semi-major axis (a)1.750±0.01
Eccentricity (e)0 (fixed)
Inclination (i)125.0±0.5°
Longitude of the node (Ω)113.4±0.4°
Periastron epoch (T)2456238.134 ± 0.002 HJD
Argument of periastron (ω)
(secondary)
90 (fixed)°
Details[6]
UX Ari Aa
Mass1.30±0.06 M
Radius5.6±0.1 R
Luminosity9.3±0.7 L
Surface gravity (log g)3.06±0.04 cgs
Temperature4,560±100 K
Rotation6.44 d[3]
UX Ari Ab
Mass1.14±0.06 M
Radius1.6±0.2 R
Luminosity2.34±0.28 L
Surface gravity (log g)4.09±0.16 cgs
Temperature5,670±100 K
Other designations
BD+28° 532, CCDM 03266+2843, HD 21242, HIP 16042, SAO 75927.
Database references
SIMBADdata
ARICNSdata

References

  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357Vizier catalog entry
  2. Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441–443, Bibcode:1984PASP...96..441G, doi:10.1086/131362
  3. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv..17..251S, doi:10.1007/s00159-009-0020-6
  4. Alekseev, I. Yu. (September 2014), "Three-Component Model of Spottedness in the Classical RS CVn System UX Ari", Astrophysics, 57 (3): 344–351, Bibcode:2014Ap.....57..344A, doi:10.1007/s10511-014-9339-4
  5. Karataş, Y.; et al. (April 2004), "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution", Monthly Notices of the Royal Astronomical Society, 349 (3): 1069–1092, arXiv:astro-ph/0404219, Bibcode:2004MNRAS.349.1069K, doi:10.1111/j.1365-2966.2004.07588.x
  6. Hummel, C. A.; et al. (August 2017), "Orbital Elements and Stellar Parameters of the Active Binary UX Arietis", The Astrophysical Journal, 844 (2): 12, Bibcode:2017ApJ...844..115H, doi:10.3847/1538-4357/aa7b87, hdl:10871/32318, 115.

Further reading

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