56 Arietis

56 Arietis

A light curve for 56 Arietis from STEREO spacecraft data. Adapted from Wraight et al. (2012)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 12m 14.2461s[2]
Declination +27° 15′ 25.086″[2]
Apparent magnitude (V) 5.79[3] (5.75 – 5.81)[4]
Characteristics
Spectral type B9pSi[5]
U−B color index −0.42[3]
B−V color index −0.12[3]
Variable type SX Ari[4]
Astrometry
Radial velocity (Rv)+18.0[6] km/s
Proper motion (μ) RA: +11.899(94) mas/yr[2]
Dec.: −18.294(88) mas/yr[2]
Parallax (π)7.8671 ± 0.0651 mas[2]
Distance415 ± 3 ly
(127 ± 1 pc)
Absolute magnitude (MV)+0.25[7]
Details
Mass2.61[8] M☉
Radius2.58[8] R☉
Luminosity151[8] L☉
Surface gravity (log g)3.97[8] cgs
Temperature12,420[8] K
Metallicity [Fe/H]+0.45[9] dex
Rotation0.7278972 days[7]
Rotational velocity (v sin i)160[9] km/s
Age174[10] Myr
Other designations
56 Ari, SX Ari, BD+26°523, HD 19832, HIP 14893, HR 954, SAO 75788[11]
Database references
SIMBADdata

56 Arietis is a single,[12] 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.[3] The estimated distance to this star is approximately 415 light-years (127 parsecs), based on parallax,[2] and it is drifting further away with a radial velocity of +18 km/s.[6]

This is a magnetic, chemically peculiar star of the silicon type with a stellar classification of B9pSi,[5] and it has a rapid rotation period of 17.5 hours.[13] This period is increasing by about two seconds every hundred years.[14] The star displays evidence of a five year period for procession of its axis.[15] 56 Arietis 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.[4]

  1. ^ Cite error: The named reference Wraight was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference pasp70_412_90 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa334_181 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference glagolevskij2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference ghazaryan2018 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference gontcharov2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference ibvs4835_1 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Sokolov2006 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Adelman2001 was invoked but never defined (see the help page).