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Zeta Apodis
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus[1] |
| Right ascension | 17h 21m 59.47769s[2] |
| Declination | −67° 46′ 14.4084″[2] |
| Apparent magnitude (V) | +4.78[3] |
| Characteristics | |
| Spectral type | K2 III[4] |
| U−B color index | +1.27[3] |
| B−V color index | +1.21[3] |
| Astrometry | |
| Radial velocity (Rv) | +11.38±0.12[2] km/s |
| Proper motion (μ) | RA: −37.437 mas/yr[2] Dec.: −7.925 mas/yr[2] |
| Parallax (π) | 11.1175±0.1047 mas[2] |
| Distance | 293 ± 3 ly (89.9 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.04[1] |
| Details | |
| Mass | 1.51+0.99 −0.53[5] M☉ |
| Radius | 18.608[6] R☉ |
| Luminosity | 126±8[6] L☉ |
| Temperature | 4,486±125[6] K |
| Metallicity [Fe/H] | −0.30[5] dex |
| Other designations | |
| ζ Aps, CPD−67 3310, FK5 3374, HD 156277, HIP 84969, HR 6417, SAO 253882[7] | |
| Database references | |
| SIMBAD | data |
Zeta Apodis is a star in the southern constellation of Apus. Its identifier is a Bayer designation that is Latinized from ζ Apodis, and abbreviated Zet Aps or ζ Aps, respectively. The star has an apparent visual magnitude of +4.78,[3] 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).[2] It is drifting further away with a heliocentric radial velocity of +11 km/s.[2]
The spectrum of Zeta Apodis matches a stellar classification of K2 III,[4] with the luminosity class of III indicating it is an evolved giant star. Zeta Apodis has roughly 1.5 times the Sun's mass,[5] and expanded to 18 times the size of the Sun. It radiates 126 times the luminosity of the Sun from its photosphere at an effective temperature of 4,486 K,[6] giving it the orange-hued glow of a K-type star.[8]
Naming
[edit]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 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.)[9]
References
[edit]- ^ a b 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 e f g 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.
- ^ a b c Charbonnel, C.; et al. (January 1, 2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360, ISSN 0004-6361
- ^ 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
