(Translated by https://www.hiragana.jp/)
Omicron1 Eridani - Wikipedia Jump to content

Omicron1 Eridani

From Wikipedia, the free encyclopedia
(Redirected from Beid)
For other stars with this Bayer designation, see Omicron Eridani.
οおみくろん1 Eridani

A light curve for Omicron1 Eridani, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 04h 11m 51.93956s[2]
Declination −06° 50′ 15.2864″[2]
Apparent magnitude (V) 4.04[3]
Characteristics
Spectral type F0 III[4]
U−B color index +0.10[3]
B−V color index +0.32[3]
Variable type δでるた Scuti[5]
Astrometry
Proper motion (μみゅー) RA: +10.76[2] mas/yr
Dec.: +81.92[2] mas/yr
Parallax (πぱい)26.80 ± 0.32 mas[2]
Distance122 ± 1 ly
(37.3 ± 0.4 pc)
Absolute magnitude (MV)+1.18[6]
Details
Mass1.95[5] M☉
Radius3.7±0.1[5] R☉
Luminosity27[5] L☉
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
Other designations
Beid, οおみくろん1 Eri, 38 Eri, BD−07°764, FK5 154, HD 26574, HIP 19587, HR 1298, SAO 131019[8]
Database references
SIMBADdata

Omicron1 Eridani (οおみくろん1 Eridani, abbreviated Omicron1 Eri, οおみくろん1 Eri), also named Beid /ˈbaɪd/,[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

[edit]

οおみくろん1 Eridani (Latinised to Omicron1 Eridani) is the star's Bayer designation.

The system bears the traditional name Beid derived from the Arabic word بيض bayḍ 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, 九州きゅうしゅう殊こと口こう (Jiǔ Zhōu Shū Kǒu), meaning Interpreters of Nine Dialects, refers to an asterism consisting of οおみくろん1 Eridani, 39 Eridani, Xi Eridani, Nu Eridani, 56 Eridani and 55 Eridani.[12] Consequently, the Chinese name for Omicron1 Eridani itself is 九州きゅうしゅう殊こと口こう二に (Jiǔ Zhōu Shū Kǒu èr, English: the Second Star of Interpreters of Nine Dialects).[13]

Properties

[edit]

οおみくろん1 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

[edit]
  1. ^ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, retrieved 3 September 2022.
  2. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  3. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, Bibcode:1986EgUBV........0M.
  4. ^ a b c d e f Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  5. ^ a b c d e f g Balona, Luis A. (October 2000), "The δでるた Scuti star 38 o1 Eri", Monthly Notices of the Royal Astronomical Society, 318 (1): 289–293, Bibcode:2000MNRAS.318..289B, doi:10.1046/j.1365-8711.2000.03776.x.
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  7. ^ a b Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
  8. ^ "* omi01 Eri", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2016-10-11.
  9. ^ Davis, George A. (1944), "The pronunciations, derivations, and meanings of a selected list of star names", Popular Astronomy, 52: 8–30, Bibcode:1944PA.....52....8D.
  10. ^ a b Naming Stars, IAU.org, retrieved 16 December 2017.
  11. ^ IAU Division C Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  12. ^ (in Chinese) 中國ちゅうごく星座せいざ神話しんわ, written by 陳ひね久金ひさがね. Published by 台灣たいわん書房しょぼう出版しゅっぱん有限ゆうげん公司こうし, 2005, ISBN 978-986-7332-25-7.
  13. ^ (in Chinese) 香港ほんこん太たい空そら館かん - 研究けんきゅう資源しげん - 亮あきら星ほし中ちゅう英えい對照たいしょう表ひょう Archived 2010-08-11 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  14. ^ Rodríguez, E.; et al. (June 2000), "A revised catalogue of δでるた Sct stars", Astronomy and Astrophysics Supplement, 144 (3): 469–474, Bibcode:2000A&AS..144..469R, doi:10.1051/aas:2000221, hdl:10261/226673.
  15. ^ Van Belle, Gerard T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
[edit]
  • Kaler, James B. (January 13, 2012), "Beid", Stars, University of Illinois, retrieved 2016-10-11.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Omicron1_Eridani&oldid=1253432192"