Delta3 Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 25m 29.38340s[1] |
| Declination | +17° 55′ 40.4579″[1] |
| Apparent magnitude (V) | +4.32 (4.35 + 8.37)[2] |
| Characteristics | |
| Spectral type | A2IV-Vs[3] |
| Astrometry | |
| Proper motion (μ) | RA: +41.91[1] mas/yr Dec.: −34.54[1] mas/yr |
| Parallax (π) | 21.96±0.51 mas[1] |
| Distance | 149 ± 3 ly (46 ± 1 pc) |
| Absolute magnitude (MV) | +1.14[4] |
| Details | |
| Mass | 2.27±0.23[5] M☉ |
| Radius | 2.4[6] R☉ |
| Luminosity | 29.5[5] L☉ |
| Surface gravity (log g) | 3.95[5] cgs |
| Temperature | 9,025[5] K |
| Metallicity [Fe/H] | +0.32[7] dex |
| Rotation | 2.13[8] days |
| Rotational velocity (v sin i) | 11.3[5] km/s |
| Age | 630[9] Myr |
| Other designations | |
| Cleeia, δ3 Tau, 68 Tauri, BD+17°719, HD 27962, HIP 20648, HR 1389, SAO 93923, ADS 3206[10] | |
| Database references | |
| SIMBAD | data |
Delta3 Tauri (δ3 Tauri) is a binary star[2] system in the zodiac constellation of Taurus. Based upon an annual parallax shift of 21.96 mas as seen from Earth,[1] it is located roughly 149 light years distant from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of +4.32.[2] δ3 Tauri is separated from δ1 Tauri by 0.72° on the sky.[10] Some modern astronomy books give this star the name Cleeia,[11][12] from the Greek Kleeia (transliteration of Κλεεια),[13] who was one of the Hyades sisters. It is considered a member of the Hyades cluster.[5]
In Chinese, 畢宿 (Bì Xiù), meaning Net, refers to an asterism consisting δ3 Tauri, ε Tauri, δ1 Tauri, γ Tauri, Aldebaran, 71 Tauri and λ Tauri.[14] Consequently, the Chinese name for δ3 Tauri itself is 畢宿二 (Bì Xiù èr), "the Second Star of Net".[15]
The magnitude 4.35[2] primary, component A, appears to be an A-type star intermediate between main sequence and subgiant, with a stellar classification of A2 IV-Vs. The "s" indicates sharp (unusually narrow) absorption lines, a sign of slow rotation. It is a candidate blue straggler and shows characteristics of an Am star. Abt (1985) gave it a classification of A2kA3hA5m, indicating that the spectrum displays the calcium K-line of an A2 star, the hydrogen lines of an A3 star and the metal lines of an A5 star. It is deficient in scandium but has enhanced iron peak and heavy elements.[5] Although suspected of variability in the past,[16] Delta3 Tauri A was subsequently determined to be photometrically constant.[17]
The companion, component B, is a magnitude 8.37[2] star at an angular separation of 1.80 arc seconds along a position angle of 341°, as of 2010. At 77 arcseconds away (as of 2006) is a magnitude 11.12 visual companion, designated component C.[18]
References
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- ^ (in 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, Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)..
- ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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