Zeta Apodis, Latinized from ζ Apodis, is the Bayer designation for a star in the southern constellation of Apus. It has an apparent visual magnitude of +4.78,[2] which is bright enough to allow it to be seen with the naked eye. The distance to this star is known from parallax measurements to be around 293 light-years (90 parsecs).[1]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| Right ascension | 17h 21m 59.47769s[1] |
| Declination | −67° 46′ 14.4084″[1] |
| Apparent magnitude (V) | +4.78[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−B color index | +1.27[2] |
| B−V color index | +1.21[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.38±0.12[1] km/s |
| Proper motion (μ) | RA: −37.437 mas/yr[1] Dec.: −7.925 mas/yr[1] |
| Parallax (π) | 11.1175 ± 0.1047 mas[1] |
| Distance | 293 ± 3 ly (89.9 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.04[4] |
| Details | |
| Radius | 18.608[5] R☉ |
| Luminosity | 126±8[5] L☉ |
| Temperature | 4,486±125[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of Zeta Apodis matches a stellar classification of K2 III,[3] with the luminosity class of III indicating it is an evolved giant star. Zeta Apodis has expanded to 18 times the size of the Sun irradiates with 126 times the luminosity of the Sun. The outer atmosphere has an effective temperature of 4,486 K,[5] which gives it the orange-hued glow of a K-type star.[7]
Naming
editIn 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 ζ Apodis, ι Apodis, β Apodis, γ Apodis, δ Octantis, δ1 Apodis, η Apodis, α Apodis and ε Apodis. Consequently, ζ Apodis itself is known as 異雀一 (Yì Què yī, English: the First Star of Exotic Bird.)[8]
References
edit- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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.
- ^ a b Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471 (1): 770–791, arXiv:1706.02208, doi:10.1093/mnras/stx1433, ISSN 0035-8711 Zeta Apodis' database entry at VizieR.
- ^ "zet Aps". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-02-04.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日 Archived 2011-05-22 at the Wayback Machine