Astronomy:Gamma Apodis
 | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 16h 33m 27.08379s[1] |
| Declination | −78° 53′ 49.7372″[1] |
| Apparent magnitude (V) | 3.86[2] |
| Characteristics | |
| Spectral type | G9 III[2] |
| U−B color index | +0.62[3] |
| B−V color index | +0.91[3] |
| Astrometry | |
| Radial velocity (Rv) | +5.7[2] km/s |
| Proper motion (μ) | RA: –126.122 ± 0.688[4] mas/yr Dec.: –78.699 ± 0.667[4] mas/yr |
| Parallax (π) | 21.7674 ± 0.5542[4] mas |
| Distance | 150 ± 4 ly (46 ± 1 pc) |
| Absolute magnitude (MV) | +0.41[5] |
| Details | |
| Surface gravity (log g) | 3.5[6] cgs |
| Temperature | 5,040[6] K |
| Metallicity [Fe/H] | –0.05[6] dex |
| Rotational velocity (v sin i) | 2.7[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Apodis (γ Aps, γ Apodis) is the Bayer designation for a star in the southern circumpolar constellation of Apus. From parallax measurements, the distance to this star can be estimated as 150 ± 4 light-years (46.0 ± 1.2 pc).[4] It is visible to the naked eye with an apparent visual magnitude of 3.86.[2] A stellar classification of G9 III[2] identifies it as a giant star in the later stages of its evolution. It is an active X-ray source with a luminosity of 1.607 × 1030 erg s−1, making it one of the 100 strongest stellar X-ray sources within 50 parsecs of the Sun.[8]
Naming
In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 異雀 (Yì Què), meaning Exotic Bird, refers to an asterism consisting of γ Apodis, ζ Apodis, ι Apodis, β Apodis, δ Octantis, δ1 Apodis, η Apodis, α Apodis and ε Apodis. Consequently, γ Apodis itself is known as 異雀四 (Yì Què sì, English: the Fourth Star of Exotic Bird).[9]
References
- ↑ 1.0 1.1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 da Silva, L. et al. (December 2009), "Search for associations containing young stars (SACY). III. Ages and Li abundances", Astronomy and Astrophysics 508 (2): 833–839, doi:10.1051/0004-6361/200911736, Bibcode: 2009A&A...508..833D.
- ↑ 3.0 3.1 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 4.0 4.1 4.2 4.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C.
- ↑ 6.0 6.1 6.2 Abia, C. et al. (November 1988), "Abundances of light metals and NI in a sample of disc stars", Astronomy and Astrophysics 206 (1): 100–107, Bibcode: 1988A&A...206..100A.
- ↑ "gam Aps". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=gam+Aps.
- ↑ Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal 126 (4): 1996–2008, doi:10.1086/378164, Bibcode: 2003AJ....126.1996M.
- ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日
 |  |
