Omicron1 Eridani

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ο1 Eridani
File:Omicron1EriLightCurve.png
A light curve for Omicron1 Eridani, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.04[3]
Characteristics
Spectral type F0 III[4]
U−B Template:Engvar +0.10[3]
B−V Template:Engvar +0.32[3]
Variable type δ Scuti[5]
Astrometry
Proper motion (μ) RA: +10.76[2] mas/yr
Dec.: +81.92[2] mas/yr
Parallax (π)26.80±0.32 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.18[6]
Details
Mass1.95[5] Template:Solar mass
RadiusTemplate:Val[5] Template:Solar radius
Luminosity27[5] Template:Solar luminosity
Surface gravity (log g)3.39[4] cgs
Temperature6,963[4] K
Metallicity [Fe/H]−0.01[4] dex
Rotational velocity (v sin i)108.1[7] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Beid, ο1 Eri, 38 Eri, BD−07°764, FK5 154, HD 26574, HIP 19587, HR 1298, SAO 131019[8]
Database references
SIMBADdata

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Omicron1 Eridani (ο1 Eridani, abbreviated Omicron1 Eri, ο1 Eri), also named Beid Template:IPAc-en,[9][10] is a variable star in the constellation of Eridanus. With an average apparent visual magnitude of 4.04,[3] it is visible to the naked eye on a clear, dark night. Based upon parallax measurements, it lies approximately 122 light-years from the Sun.

Nomenclature

ο1 Eridani (Latinised to Omicron1 Eridani) is the star's Bayer designation.

The system bears the traditional name Beid derived from the Arabic word بيض Template:Transliteration meaning "eggs" (cf. neighboring Keid "(egg)shells"). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[11] to catalogue and standardize proper names for stars. The WGSN approved the name Beid for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[10]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Interpreters of Nine Dialects, refers to an asterism consisting of ο1 Eridani, 39 Eridani, Xi Eridani, Nu Eridani, 56 Eridani and 55 Eridani.[12] Consequently, the Chinese name for Omicron1 Eridani itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[13]

Properties

ο1 Eridani is an evolved F-type giant star with a stellar classification of F0 III.[4] It is a Delta Scuti variable star that undergoes non-radial pulsations,[5] with a variation of just 0.03 magnitude over a period of 0.0747 days.[14] The star is spinning rapidly with a projected rotational velocity of 108.1 km/s[7] and a rotation period of less than around 1.9 days.[5] This is creating an equatorial bulge that is 11% wider than the polar radius.[15] Omicron1 Eridani has nearly double the mass of the Sun, 3.7 times the Sun's radius, and shines with 27 times the solar luminosity[5] from an outer atmosphere at an effective temperature of 6,963 K.[4]

References

Template:Reflist

External links

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Template:Stars of Eridanus

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Mermilliod1986
  4. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Gray2006
  5. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Balona2000
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Schroeder2009
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Davis44
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named zh
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named lcsd
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Rodriguez2000
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named vanbelle2012
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