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Gamma Apodis
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus[1] |
| Right ascension | 16h 33m 27.08252s[2] |
| Declination | −78° 53′ 49.7334″[2] |
| Apparent magnitude (V) | 3.86[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | G9 III[3] |
| U−B color index | +0.62[5] |
| B−V color index | +0.91[5] |
| Astrometry | |
| Radial velocity (Rv) | +5.7[3] km/s |
| Proper motion (μ) | RA: −125.575 mas/yr[2] Dec.: −78.212 mas/yr[2] |
| Parallax (π) | 21.3033±0.1523 mas[2] |
| Distance | 153 ± 1 ly (46.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.41[6] |
| Details | |
| Mass | 2.32[7] M☉ |
| Radius | 10.293[8] R☉ |
| Surface gravity (log g) | 3.074±0.081[9] cgs |
| Temperature | 5,151±50[9] K |
| Metallicity [Fe/H] | 0.090±0.042[9] dex |
| Rotational velocity (v sin i) | 5.016±0.417[9] km/s |
| Age | 2.67[7] Gyr |
| Other designations | |
| γ Aps, γ Apodis, CPD−78°1103, FK5 611, GJ 626.1, GJ 9563, HD 147675, HIP 81065, HR 6102, SAO 257407[10] | |
| Database references | |
| SIMBAD | data |
Gamma Apodis is a star in the southern circumpolar constellation of Apus. Its identifier is a Bayer designation that is Latinized from γ Apodis, and is abbreviated Gam Aps or γ Aps, respectively. It is visible to the naked eye with an apparent visual magnitude of 3.86.[3] From parallax measurements, the distance to this star can be estimated as 153 light-years (47 pc). The star is receding with a heliocentric radial velocity of +5.7 km/s.[3]
A stellar classification of G9 III[3] identifies Gamma Apodis as a giant star in the later stages of its evolution. This is a red clump giant, which means it is on the horizontal branch and is generating energy through core helium fusion.[4] The star has 2.3[7] times the mass of the Sun and has expanded to 10.3[8] times the Sun's radius. It is 2.7[7] billion years old and is spinning with a projected rotational velocity of 5 km/s.[9] This 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.[11]
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 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).[12]
References
[edit]- ^ 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.
- ^ a b c d 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 e f 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, arXiv:0909.0677, Bibcode:2009A&A...508..833D, doi:10.1051/0004-6361/200911736, S2CID 119282110.
- ^ a b Gontcharov, G. A. (2008), "Red giant clump in the Tycho-2 catalogue", Astronomy Letters, 34 (11): 785, arXiv:1607.00619, Bibcode:2008AstL...34..785G, doi:10.1134/S1063773708110078.
- ^ a b 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.
- ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID 12136256.
- ^ a b c d Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
- ^ a b Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane; Dressing, Courtney D.; Huber, Daniel; Kane, Stephen R.; Lépine, Sébastien; Mann, Andrew; Muirhead, Philip S.; Rojas-Ayala, Bárbara; Silvotti, Roberto; Fleming, Scott W.; Levine, Al; Plavchan, Peter; the TESS Target Selection Working Group (2018), "The TESS Input Catalog and Candidate Target List", The Astronomical Journal, 156 (3): 102, arXiv:1706.00495, Bibcode:2018AJ....156..102S, doi:10.3847/1538-3881/aad050.
- ^ a b c d e Perdelwitz, V.; et al. (March 2024), "Analysis of the public HARPS/ESO spectroscopic archive. Ca II H&K time series for the HARPS radial velocity database", Astronomy & Astrophysics, 683, id. A125, arXiv:2311.12438, Bibcode:2024A&A...683A.125P, doi:10.1051/0004-6361/202348263.
- ^ "gam Aps", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-06-29.
- ^ Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal, 126 (4): 1996–2008, Bibcode:2003AJ....126.1996M, doi:10.1086/378164.
- ^ (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
