Gamma Apodis

γ Apodis
Location of γ Apodis (circled)
Observation data
Epoch J2000      Equinox ICRS
Constellation Apus
Right ascension 16h 33m 27.08252s
Declination −78° 53′ 49.7334″
Apparent magnitude (V) 3.86
Characteristics
Evolutionary stage red clump
Spectral type G9 III
U−B color index +0.62
B−V color index +0.91
Astrometry
Radial velocity (Rv)+5.7 km/s
Proper motion (μ) RA: −125.575 mas/yr
Dec.: −78.212 mas/yr
Parallax (π)21.3033±0.1523 mas
Distance153 ± 1 ly
(46.9 ± 0.3 pc)
Absolute magnitude (MV)+0.41
Details
Mass2.32 M☉
Radius10.293 R☉
Surface gravity (log g)3.074±0.081 cgs
Temperature5,151±50 K
Metallicity [Fe/H]0.090±0.042 dex
Rotational velocity (v sin i)5.016±0.417 km/s
Age2.67 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
Database references
SIMBADdata

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. 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.

A stellar classification of G9 III 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. The star has 2.3 times the mass of the Sun and has expanded to 10.3 times the Sun's radius. It is 2.7 billion years old and is spinning with a projected rotational velocity of 5 km/s. 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.

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).

References

  1. ↑ 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.
  2. 1 2 3 4 5 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.
  3. 1 2 3 4 5 6 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.
  4. 1 2 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.
  5. 1 2 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.
  6. ↑ 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.
  7. 1 2 3 4 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.
  8. 1 2 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.
  9. 1 2 3 4 5 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.
  10. ↑ "gam Aps", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-06-29.
  11. ↑ 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.
  12. ↑ (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