Delta Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 03h 11m 37.7655s |
| Declination | +19° 43′ 36.039″ |
| Apparent magnitude (V) | 4.35 |
| Characteristics | |
| Spectral type | K2III |
| U−B color index | 0.87 |
| B−V color index | 1.03 |
| R−I color index | 0.51 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | 24.7 km/s |
| Proper motion (μ) | RA: 154.61 mas/yr Dec.: -8.39 mas/yr |
| Parallax (π) | 19.44 ± 1.23 mas |
| Distance | 170 ± 10 ly (51 ± 3 pc) |
| Details | |
| Radius | 10.42 ± 0.97[1] R☉ |
| Luminosity | 45 ± 6[1] L☉ |
| Surface gravity (log g) | 2.93[1] |
| Temperature | 4,810[1] K |
| Metallicity [Fe/H] | –0.03[1] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Delta Arietis (δ Ari, δ Arietis) is a star in the constellation Aries. It has the traditional name Botein which is derived from the Arabic بطين buṭayn, diminutive of بطن baṭn "belly".
The term Botein is derived from Al Bīrūnī's Al Buṭayn (ألبطين), the dual of Al Baṭn, the Belly. This is the name of star association consisting this star, along with ε Ari, ζ Ari, π Ari, and ρ3 Ari[2]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars :δ Ari as Botein, π Ari as Al Buṭain I, ρ3 Ari as Al Buṭain II, ε Ari as Al Buṭain III dan ζ Ari as Al Buṭain IV[3]
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Nir al Botain, which was translated into Latin as Lucida Ventris, meaning the brightest of the belly.[4]
In Chinese, 天陰 (Tiān Yīn), meaning Yin Force, refers to an asterism consisting of δ Arietis, 63 Arietis, ζ Arietis, τ Arietis and 65 Arietis.[5] Consequently, δ Arietis itself is known as 天陰四 (Lóu Su sì, English: the Fourth Star of Yin Force.)[6]
[edit] Structure
Delta Arietis is an orange K-type giant with an apparent magnitude of +4.35. It is approximately 168 light years from Earth and its diameter is 13 times that of the Sun.
[edit] References
- ^ a b c d e Piau, L. et al. (February 2011), "Surface convection and red-giant radius measurements", Astronomy and Astrophysics 526: A100, Bibcode 2011A&A...526A.100P, doi:10.1051/0004-6361/201014442
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 83. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Aries*.html. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
- ^ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society 55: 429. Bibcode 1895MNRAS..55..429K.
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
[edit] External links
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