Alpha Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Columba |
| Right ascension | 05h 39m 38.9399s[1] |
| Declination | −34° 04′ 26.788″[1] |
| Apparent magnitude (V) | 2.60[1] |
| Characteristics | |
| Spectral type | B7IVe[1] |
| U−B color index | -0.46[2] |
| B−V color index | -0.12[2] |
| R−I color index | -0.09[2] |
| Astrometry | |
| Radial velocity (Rv) | 35 ± 5[1] km/s |
| Proper motion (μ) | RA: -0.10[1] mas/yr Dec.: -24.05[1] mas/yr |
| Parallax (π) | 12.16 ± 0.60[1] mas |
| Distance | 270 ± 10 ly (82 ± 4 pc) |
| Absolute magnitude (MV) | [3] |
| Details | |
| Mass | 4.5[4] M☉ |
| Radius | 7[4] R☉ |
| Luminosity (bolometric) | 1,000[4] L☉ |
| Temperature | 12,500[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Columbae (α Columbae, α Col) is a 3rd magnitude and the brightest star in the constellation Columba. It is also known as Phact.
[edit] Physical charactericities
Alpha Columbae is a binary star system CCDM J05396-3404. The primary star (CCDM J05396-3404 A) is a Be-type subgiant. It is suspected Gamma Cassiopeiae type (GCAS) variable star, varying from apparent magnitude 2.62m to 2.66m. There is an expanding gas shell around the star.[5] Its faint companion (CCDM J05396-3404 B) has an apparent magnitude of 12.3m and is 13.5" distant from the primary star.[6]
[edit] Name
The proper name "Phact" (also Phad, Phaet, Phakt[5]) derived from the Arabic ألفاجتة - fākh(i)tah [fa:x(i)ta] which meaning "ring dove". It was originally applied to the constellation Cygnus as al-Fākhtah, but later transferred to this star.[7][8][9][10] The etymology of its name hadāri (unknown meaning)[11] has also been suggested.
In Chinese, 丈人 (Zhàng Rén), meaning Grandfather, refers to an asterism consisting of α Columbae and ε Columbae.[12] Consequently, α Columbae itself is known as 天囷一 (Zhàng Rén yī, English: the First Star of Grandfather.).[13] From this Chinese name, the name Chang Jin was appeared[14]
[edit] References
- ^ a b c d e f g h i * alf Col -- Be Star, database entry, SIMBAD. Accessed on line April 21, 2009.
- ^ a b c HR 1956, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line April 21, 2009.
- ^ From apparent magnitude and parallax.
- ^ a b c d Jim Kaler: Phact - STARS. Accessed on line April 21, 2009.
- ^ a b Note of HR 1956, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line April 21, 2009.
- ^ CCDM J05396-3404, database entry, J. Dommanget and O. Nys (2002) Catalogue of the Components of Double and Multiple Stars, Accessed on line April 21, 2009.
- ^ Davis, Jr., G. A., (1971). Pronunciations, Derivations, and Meanings of a Selected List of Star Names (rep. ed.). Cambridge, MA: Sky Pub. Corp. p. 11.
- ^ Kunitzsch, P., (1959). Arabische Sternnamen in Europa. Wiesbaden: Otto Harrassowitz. pp. 191–192.
- ^ Laffitte, R., (2005). Héritages arabes: Des noms arabes pour les étoiles (2éme revue et corrigée ed.). Paris: Librairie Orientaliste Paul Geunthner / Les Cahiers de l'Orient. p. 223.
- ^ Kunitzsch, P., & Smart, T., (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, MA: Sky Pub. p. 30. ISBN 978-1-931559-44-7.
- ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc.. p. 167. ISBN 0-486-21079-0.
- ^ (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 978-986-7332-25-7.
- ^ (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.
- ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Columbae
|
|||||||||||
 |
This subgiant star-related article is a stub. You can help Wikipedia by expanding it. |
