Omicron1 Eridani
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| 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] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.18[6] |
| Details | |
| Mass | 1.95[5] Template:Solar mass |
| Radius | Script error: No such module "val".[5] Template:Solar radius |
| Luminosity | 27[5] Template:Solar luminosity |
| Surface gravity (log g) | 3.39[4] cgs |
| Temperature | 6,963[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 | |
| SIMBAD | data |
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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 Script error: No such module "lang". 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
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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External links
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