Astronomy:Tau1 Arietis

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Short description: Binary star system in the constellation Aries
For other stars with this Bayer designation, see τ Arietis.
τ1 Arietis
Aries constellation map.svg
Red circle.svg
Location of τ1 Arietis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries
Right ascension  03h 21m 13.62462s[1]
Declination +21° 08′ 49.4390″[1]
Apparent magnitude (V) 5.27[2]
Characteristics
Spectral type B5 IV[3]
U−B color index −0.53[2]
B−V color index −0.06[2]
Astrometry
Radial velocity (Rv)+14[4] km/s
Proper motion (μ) RA: +25.651[1] mas/yr
Dec.: −19.850[1] mas/yr
Parallax (π)6.1786 ± 0.2066[1] mas
Distance530 ± 20 ly
(162 ± 5 pc)
Absolute magnitude (MV)−0.66[5]
Details
Mass5.0±0.1[6] M☉
Radius4.45[1] R☉
Luminosity234[5] L☉
Surface gravity (log g)3.68[1] cgs
Temperature12,606[1] K
Metallicity [Fe/H]−0.63[1] dex
Rotational velocity (v sin i)30[7] km/s
Age54.8±5.4[6] Myr
Other designations
τ1 Ari, 61 Arietis, BD+20 543, FK5 1094, HD 20756, HIP 15627, HR 1005, SAO 75886.[8]
Database references
SIMBADdata

Tau1 Arietis, Latinized from τ1 Arietis, is the Bayer designation for a triple star system[9] in the northern constellation of Aries. Based upon an annual parallax shift of 6.1786 mas, it is approximately 530 light-years (162 parsecs) distant from Earth. The combined apparent visual magnitude is 5.27,[2] making it faintly visible to the naked eye.

A light curve for Tau1 Arietis, plotted from TESS data[10]

The Tau1 Arietis system contains three stars. The inner pair form an eclipsing binary system, with the brightness of the pair decreasing by 0.06 in magnitude during an eclipse of the primary.[11] Its period is 2.20356 days.[12] The third component is located at an angular separation of 0.810 arcseconds and has a magnitude of 8.17.[9] The primary component is a subgiant star with a stellar classification of B5 IV.[3] It has five times the mass of the Sun[6] with about four times the Sun's radius.[1]

This system is a member of the Cas-Tau OB association of stars that share a common motion through space.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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, doi:10.1086/111220, Bibcode: 1971AJ.....76.1058C. 
  3. ↑ 3.0 3.1 Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement 17: 371, doi:10.1086/190179, Bibcode: 1968ApJS...17..371L. 
  4. ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, pp. 57, Bibcode: 1967IAUS...30...57E. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 6.2 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  7. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A. 
  8. ↑ "tau01 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau01+Ari. 
  9. ↑ 9.0 9.1 Eggleton, P. P.; Tokovinin, A. A. (September 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. 
  10. ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 8 December 2021. 
  11. ↑ Malkov, O. Yu. et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics 446 (2): 785–789, doi:10.1051/0004-6361:20053137, Bibcode: 2006A&A...446..785M. 
  12. ↑ tau 1 Ari, AAVSO, https://www.aavso.org/vsx/index.php?view=detail.top&oid=3762, retrieved 17 July 2022. 
  13. ↑ de Zeeuw, P. T. et al. (January 1999), "A HIPPARCOS Census of the Nearby OB Associations", The Astronomical Journal 117 (1): 354–399, doi:10.1086/300682, Bibcode: 1999AJ....117..354D. 

External links



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