UX Arietis

UX Arietis
	; A visual band light curve for UX Arietis, adapted from Ulvås and Henry (2003)
Observation data; Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	03h 26m 35.38922s
Declination	+28° 42′ 54.3169″
Apparent magnitude (V)	6.47
Characteristics
Spectral type	G5IV
U−B color index	0.43
B−V color index	0.90
Variable type	RS CVn
Astrometry
Radial velocity (Rv)	+26.53 km/s
Proper motion (μ)	RA: +41.65 mas/yr ; Dec.: −104.03 mas/yr
Parallax (π)	19.37 ± 0.70 mas
Distance	168 ± 6 ly ; (52 ± 2 pc)
Orbit
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
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
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
	BD+28° 532, CCDM 03266+2843, HD 21242, HIP 16042, SAO 75927.
Database references
SIMBAD	data
ARICNS	data

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.^[2] 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.^[5] The star varies in brightness from magnitude 6.35 to 6.71, meaning it may be intermittently visible to the unaided eye under ideal dark-sky conditions.^[8]

References[]

^ Ulvås, V. Aarum; Henry, G. W. (May 2003). "BV photometry of UX Ari in the period 1987–2002". Astronomy & Astrophysics. 402: 1033–1041. doi:10.1051/0004-6361:20030304. Retrieved 28 October 2021.
^ ^a ^b ^c ^d 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:10.1051/0004-6361:20078357, S2CID 18759600Vizier catalog entry
^ ^a ^b ^c 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
^ ^a ^b 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
^ ^a ^b 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, S2CID 119963417
^ Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. (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. S2CID 15290475.
^ ^a ^b 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.
^ "UX Ari". The International Variable Star Index. AAVSO. Retrieved 28 October 2021.

External links[]

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[Ulvås-1] Ulvås, V. Aarum; Henry, G. W. (May 2003). "BV photometry of UX Ari in the period 1987–2002". Astronomy & Astrophysics. 402: 1033–1041. doi:10.1051/0004-6361:20030304. Retrieved 28 October 2021.

[van_Leeuwen2007-2] 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:10.1051/0004-6361:20078357, S2CID 18759600Vizier catalog entry

[pasp96_441-3] 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

[aar17_3_251-4] 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

[ap57_3_344-5] 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, S2CID 119963417

[mnras349_1_1069-6] Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. (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. S2CID 15290475.

[Hummel2017-7] 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.

[IVSI-8] "UX Ari". The International Variable Star Index. AAVSO. Retrieved 28 October 2021.

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Observation data Epoch J2000 Equinox J2000
A visual band light curve for UX Arietis, adapted from Ulvås and Henry (2003)^[1]
Constellation	Aries
Right ascension	03^h 26^m 35.38922^s^[2]
Declination	+28° 42′ 54.3169″^[2]
Apparent magnitude (V)	6.47^[3]
Characteristics
Spectral type	G5IV^[4]
U−B color index	0.43^[3]
B−V color index	0.90^[3]
Variable type	RS CVn^[5]
Astrometry

Radial velocity (R_v)	+26.53^[6] km/s
Proper motion (μ)	RA: +41.65 mas/yr Dec.: −104.03 mas/yr
Parallax (π)	19.37 ± 0.70^[2] mas
Distance	168 ± 6 ly (52 ± 2 pc)

Orbit^[7]
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^[7]
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^[4]
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
BD+28° 532, CCDM 03266+2843, HD 21242, HIP 16042, SAO 75927.
Database references
SIMBAD	data
ARICNS	data

UX Arietis

References[]

Further reading[]

External links[]