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]
| 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 |
| Distance | 168 ± 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 | |
| Mass | 1.30±0.06 M☉ |
| Radius | 5.6±0.1 R☉ |
| Luminosity | 9.3±0.7 L☉ |
| Surface gravity (log g) | 3.06±0.04 cgs |
| Temperature | 4,560±100 K |
| Rotation | 6.44 d[3] |
| UX Ari Ab | |
| Mass | 1.14±0.06 M☉ |
| Radius | 1.6±0.2 R☉ |
| Luminosity | 2.34±0.28 L☉ |
| Surface gravity (log g) | 4.09±0.16 cgs |
| Temperature | 5,670±100 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
References
- 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
- 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
- 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
- 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
- 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
- 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
- Brinkman, Albert (2000). "High-Resolution Spectrum of UX Ari". Chandra Proposal ID #02200030. Bibcode:2000cxo..prop..434B.
- Drake, Stephen (1999). "Acis/hetg Spectroscopy of the Active Binaries Algol & UX Ari". Chandra Proposal ID #01200248. Bibcode:1999cxo..prop...20D.
- V. Aarum Ulvås & G. W. Henry (2003). "BV photometry of UX Ari in the period 1987-2002". Astronomy and Astrophysics.
External links
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