Theta Arietis

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Template:Short description

θ Arietis
Template:Location mark
Location of θ Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.58[3]
Characteristics
Spectral type A1 Vn[4]
U−B Template:Engvar +0.02[5]
B−V Template:Engvar +0.01[5]
Variable type Constant[6]
Astrometry
Radial velocity (Rv)+11.95±0.78[2] km/s
Proper motion (μ) RA: −7.832 mas/yr[2]
Dec.: −3.654 mas/yr[2]
Parallax (π)7.2220±0.1043 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.10[1]
Details
A
MassTemplate:Val[7]
Template:Val[8] Template:Solar mass
Radius1.9–2.5[9] Template:Solar radius
Luminosity106[1] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Rotational velocity (v sin i)186[10] km/s
AgeTemplate:Val[7] Myr
B
MassTemplate:Val[7] Template:Solar mass
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]0.0[7] dex
Rotational velocity (v sin i)5[7] km/s
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Theta Arietis, is a binary star[7] system in the northern constellation of Aries. Its name is a Bayer designation that is Latinised from θ Arietis, and abbreviated Theta Ari or θ Ari. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.58.[3] With an annual parallax shift of Template:Val,[2] the distance to this star is an estimated Template:Convert with a 7-light-year margin of error. It is drifting further away from the Sun with a radial velocity of +12 km/s.[2]

The primary, component A, is a white-hued, A-type main-sequence star with a stellar classification of A1 Vn.[4] It is spinning at a rapid pace as shown by the projected rotational velocity of 186 km/s.[10] This is causing the "nebulous" appearance of the absorption lines indicated by the 'n' suffix in the classification. In 2005, C. Neiner and associates classified this as a Be star because is displays emission features in the hydrogen Balmer lines.[6]

In 2016, a solar-mass companion was reported in close orbit around this star, based on observations using adaptive optics with the Gemini North Telescope.[7]

References

Template:Reflist

External links

Template:Stars of Aries

  1. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Gaia_DR3
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named scfs
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj74_375
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aa19_229
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Neiner_et_al_2005
  7. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named Gullikson_et_al_2016
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Zorec_Royer_2012
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa367_521
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa463_2_671
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
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