53 Arietis

53 Arietis (abbreviated 53 Ari) is a variable star in the northern constellation of Aries. 53 Arietis is the Flamsteed designation; it also bears the variable star designation UW Arietis. It is a B-type main sequence star with a stellar classification of B1.5 V[3] and mean apparent magnitude of 6.10,[2] which is near the lower limit for naked eye visibility. Based upon an annual parallax shift of 3.2 mas, the estimated distance to this star is roughly 1,020 light-years (314 parsecs).

53 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 07m 25.67315s[1]
Declination +17° 52′ 47.9696″[1]
Apparent magnitude (V) 6.10[2]
Characteristics
Spectral type B1.5 V[3]
U−B color index [4] 0.80[2]
B−V color index −0.12[2]
Variable type β Cep[4]
Astrometry
Radial velocity (Rv)+21.2[5] km/s
Proper motion (μ) RA: −23.733[1] mas/yr
Dec.: +8.080[1] mas/yr
Parallax (π)3.1874 ± 0.0630 mas[1]
Distance1,020 ± 20 ly
(314 ± 6 pc)
Details
Mass7.5±0.2[6] M☉
Radius4.2[1] R☉
Luminosity1,962[1] L☉
Surface gravity (log g)3.99[1] cgs
Temperature19,065[1] K
Metallicity [Fe/H]−0.18[1] dex
Rotational velocity (v sin i)5[7] km/s
Other designations
UW Arietis, BD+17°493, HD 19374, HIP 14514, HR 938, SAO 93284.[8]
Database references
SIMBADdata

53 Arietis is a Beta Cephei variable.[4] It is a runaway star with a peculiar velocity of 48.1 km/s relative to its neighbors.[6] The star was ejected from the Orion nebula some 4–5 million years ago, possibly when an orbiting companion exploded as a supernova.[9]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
  3. Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179.
  4. Stankov, Anamarija; Handler, Gerald (June 2005), "Catalog of Galactic β Cephei Stars", The Astrophysical Journal Supplement Series, 158 (2): 193–216, arXiv:astro-ph/0506495, Bibcode:2005ApJS..158..193S, doi:10.1086/429408, S2CID 119526948.
  5. Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  6. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  7. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  8. "53 Ari", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-08-17.
  9. Hoogerwerf, R.; de Bruijne, J. H. J.; de Zeeuw, P. T. (January 2001), "On the origin of the O and B-type stars with high velocities. II. Runaway stars and pulsars ejected from the nearby young stellar groups", Astronomy and Astrophysics, 365 (2): 49–77, arXiv:astro-ph/0010057, Bibcode:2001A&A...365...49H, doi:10.1051/0004-6361:20000014, S2CID 18970167.
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