4 Arietis

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]

4 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0
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

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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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. 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, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. "4 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 April 2019.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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