Astronomy:4 Arietis

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Short description: Star in the constellation Aries
4 Arietis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries
Right ascension  01h 48m 10.92137s[1]
Declination +16° 57′ 19.8483″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9.5 V[4]
Astrometry
Radial velocity (Rv)+5.7±1.9[5] km/s
Proper motion (μ) RA: +65.608[1] mas/yr
Dec.: −29.291[1] mas/yr
Parallax (π)11.4613 ± 0.1511[1] mas
Distance285 ± 4 ly
(87 ± 1 pc)
Details
Mass2.83[6] or
2.48±0.02[3] M☉
Radius2.2[7] R☉
Luminosity40.4±1.9[3] L☉
Surface gravity (log g)4.47±0.14[6] cgs
Temperature10,913±371[6] K
Rotational velocity (v sin i)33[6] km/s
Age257[6] Myr
Other designations
4 Ari, BD+16°203, FK5 1050, HD 10982, HIP 8387, HR 522, SAO 92637[8]
Database references
SIMBADdata

4 Arietis is a single[9] star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.86.[2] The star has an annual parallax shift of 11.46±0.15 mas,[1] which is equivalent to a distance of 285 light-years (87 parsecs) from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.[5]

This is a B-type main sequence star with a stellar classification of B9.5 V.[4] It is 257[6] million years old and is spinning with a projected rotational velocity of 33[6] km/s. The star has more than double the mass of the Sun and around 2.2[7] times the Sun's radius. It is radiating 40[3] times the Sun's luminosity from its photosphere at an effective temperature of 10,913 K.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series 52: 131–134, Bibcode: 1983A&AS...52..131O. 
  3. ↑ 3.0 3.1 3.2 3.3 Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C. 
  5. ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ "4 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Ari. 
  9. ↑ 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. 

External links



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