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56 Arietis

A light curve for 56 Arietis from STEREO spacecraft data. Adapted from Wraight et al. (2012)
Observation data Epoch J2000      Equinox J2000
Constellation	Aries
Right ascension	03 12 14.2461
Declination	+27° 15′ 25.086″
Apparent magnitude (V)	5.79 (5.75 – 5.81)
Characteristics
Spectral type	B9pSi
U−B color index	−0.42
B−V color index	−0.12
Variable type	SX Ari
Astrometry
Radial velocity (Rv)	+18.0 km/s
Proper motion (μ)	RA: +11.899(94) mas/yr Dec.: −18.294(88) mas/yr
Parallax (π)	7.8671 ± 0.0651 mas
Distance	415 ± 3 ly (127 ± 1 pc)
Absolute magnitude (MV)	+0.25
Details
Mass	2.61 M☉
Radius	2.58 R☉
Luminosity	151 L☉
Surface gravity (log g)	3.97 cgs
Temperature	12,420 K
Metallicity	+0.45 dex
Rotation	0.7278972 days
Rotational velocity (v sin i)	160 km/s
Age	174 Myr
Other designations
56 Ari, SX Ari, BD+26°523, HD 19832, HIP 14893, HR 954, SAO 75788
Database references
SIMBAD	data

56 Arietis is a single, variable star in the northern zodiac constellation of Aries. It has the variable star designation SX Arietis, while 56 Arietis is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 5.79. The estimated distance to this star is approximately 415 light-years (127 parsecs), based on parallax, and it is drifting further away with a radial velocity of +18 km/s.

This is a magnetic, chemically peculiar star of the silicon type with a stellar classification of B9pSi, and it has a rapid rotation period of 17.5 hours. This period is increasing by about two seconds every hundred years. The star displays evidence of a five year period for procession of its axis. Sanford S. Provin discovered that 56 Arietis is a variable star in 1952, and reported the discovery in 1953. It is the prototype of a class of variable stars known as SX Arietis variables, which are rotationally variable stars with strong magnetic fields. It ranges in brightness from 5.75 down to 5.81 with a cyclical period matching its rotation rate.

References

1. Wraight, K. T.; Fossati, L.; Netopil, M.; Paunzen, E.; Rode-Paunzen, M.; Bewsher, D.; Norton, A. J.; White, Glenn J. (February 2012). "A photometric study of chemically peculiar stars with the STEREO satellites – I. Magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 420 (1): 757–772. arXiv:1110.6283. Bibcode:2012MNRAS.420..757W. doi:10.1111/j.1365-2966.2011.20090.x. S2CID 14811051.
2. ^ 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.
3. ^ Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
4. ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
5. ^ 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
6. ^ Bonsack, Walter K. (February 1958), "Wavelength Variations in the Spectrum of 56 ARIETIS", Publications of the Astronomical Society of the Pacific, 70 (412): 90, Bibcode:1958PASP...70...90B, doi:10.1086/127180, S2CID 122850076
7. ^ North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.
8. ^ Glagolevskij, Yu. V. (2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin. 74 (1): 66. Bibcode:2019AstBu..74...66G. doi:10.1134/S1990341319010073. S2CID 149900274.
9. ^ Ghazaryan, S.; Alecian, G.; Hakobyan, A. A. (2018). "New catalogue of chemically peculiar stars, and statistical analysis". Monthly Notices of the Royal Astronomical Society. 480 (3): 2953–2962. arXiv:1807.06902. Bibcode:2018MNRAS.480.2953G. doi:10.1093/mnras/sty1912. S2CID 119062018.
10. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778.
11. "56 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-31.
12. 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, S2CID 14878976.
13. Ziznovsky, J.; et al. (January 2000), "The Variable Light Curve of 56 Arietis", Information Bulletin on Variable Stars, 4835: 1, Bibcode:2000IBVS.4835....1Z.
14. Sokolov, N. A. (December 2006), "Ultraviolet variability of the magnetic chemically peculiar star 56 Arietis", Monthly Notices of the Royal Astronomical Society, 373 (2): 666–676, Bibcode:2006MNRAS.373..666S, doi:10.1111/j.1365-2966.2006.11037.x.
15. Adelman, Saul J.; Malanushenko, V.; Ryabchikova, T. A.; Savanov, I. (September 2001), "On the rotation of the chemically peculiar magnetic star 56 Arietis", Astronomy and Astrophysics, 375 (3): 982–988, Bibcode:2001A&A...375..982A, doi:10.1051/0004-6361:20010895.
16. Provin, Sanford S. (September 1953). "Variation in Light of the Spectrum Variable 56 ARIETIS". Astrophysical Journal. 118: 281–284. Bibcode:1953ApJ...118..281P. doi:10.1086/145750. Retrieved 27 November 2024.

External links

• HR 954
• Image 56 Arietis

v t e Constellation of Aries
Aries in Chinese astronomy List of stars in Aries
Stars	Bayer α (Hamal) β (Sheratan) γ (Mesarthim) δ (Botein) ε ζ η θ ι κ λ μ ν ξ ο π ρ ρ ρ σ τ τ Flamsteed 1 4 7 10 11 14 15 16 19 20 21 23 26 27 29 30 31 33 35 36 38 39 (Lilii Borea) 40 41 (Bharani) 47 49 50 51 52 53 54 55 56 59 60 62 64 65 66 54 Cet 85 Cet Variable TZ UX VZ (16 Tri) HR 577 728 803 952 999 HD 12661 20367 Other BD+20°307 HIP 14810 HAT-P-25 Teegarden's Star WASP-11/HAT-P-10 WD 0145+234
Exoplanets α Arietis b HD 12661 b c HIP 14810 b c d Teegarden's Star b c WASP-11b/HAT-P-10b
Galaxies	NGC 677 680 691 694 695 716 765 770 772 781 803 817 820 821 871 877 900 901 903 904 918 935 938 972 990 992 1024 1134 1156 Other 1ES 0229+200 3C 79 4C +28.07 AO 0235+164 IC 167 IC 1801 PSO J0309+27 Segue 2 UGC 2140
Galaxy clusters MS 0302+17
Astronomical events GRB 060218
Category

• Ap stars
• SX Arietis variables
• Aries (constellation)
• Durchmusterung objects
• Flamsteed objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• Objects with variable star designations