Astronomy:Beta Apodis

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Short description: Star in the constellation Apus
Beta Apodis
Diagram showing star positions and boundaries of the Apus constellation and its surroundings
Location of β Apodis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Apus
Right ascension  16h 43m 04.659s[1]
Declination −77° 31′ 02.76″[1]
Apparent magnitude (V) +4.24[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type K0 III[4]
U−B color index +0.95[2]
B−V color index +1.06[2]
Astrometry
Radial velocity (Rv)−30.3±0.7[5] km/s
Proper motion (μ) RA: −281.986[1] mas/yr
Dec.: −354.837[1] mas/yr
Parallax (π)20.9535 ± 0.1597[1] mas
Distance156 ± 1 ly
(47.7 ± 0.4 pc)
Absolute magnitude (MV)0.819[3]
Details
Mass1.84[3] M☉
Radius11[6] R☉
Luminosity50[6] L☉
Surface gravity (log g)2.82±0.18[7] cgs
Temperature4,855±112[7] K
Metallicity [Fe/H]–0.03±0.04[7] dex
Rotational velocity (v sin i)1.3[8] km/s
Other designations
β Aps, β Apodis, CPD−77 1221, FK5 3319, HD 149324, HIP 81852, HR 6163, SAO 257424[9]
Database references
SIMBADdata

Beta Apodis is a star in the southern circumpolar constellation of Apus. Its identifier is a Bayer designation that is Latinized from β Apodis, and abbreviated Bet Aps or β Aps, respectively. The apparent visual magnitude of this star is +4.24,[2] which is bright enough to be seen with the naked eye. It is located at a distance of approximately 156 light-years (48 parsecs) from Earth,[1] as determined by parallax measurements. The star is drifting closer with a heliocentric radial velocity of −30 km/s.[5]

The spectrum of this star matches a stellar classification of K0 III,[4] which, according to models of stellar evolution, indicates that it is in the giant star stage, having exhausted the supply of hydrogen at its core. The measured angular diameter of this star is 2.09±0.11 mas.[10] At the estimated distance of this star, this yields a physical size of about 11 times the radius of the Sun.[11] The expanded outer atmosphere of Beta Apodis has an effective temperature of about 4,855 K.[7] This heat is causing it to glow with the characteristic orange hue of a K-type star.[12]

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 β Apodis, ζ Apodis, ι Apodis, γ Apodis, δ Octantis, δ1 Apodis, η Apodis, α Apodis and ε Apodis. Consequently, β Apodis itself is known as 異雀三 (Yì Què sān, English: the Third Star of Exotic Bird.)[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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. 
  3. ↑ 3.0 3.1 3.2 Liu, Y. J. et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society 382 (2): 553–66, doi:10.1111/j.1365-2966.2007.11852.x, Bibcode: 2007MNRAS.382..553L. 
  4. ↑ 4.0 4.1 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51: 79, Bibcode: 1962RGOB...51...79E. 
  5. ↑ 5.0 5.1 Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E. 
  6. ↑ 6.0 6.1 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023), "Variability Catalog of Stars Observed during the TESS Prime Mission", The Astrophysical Journal Supplement Series 268 (1): 4, doi:10.3847/1538-4365/acdee5, Bibcode: 2023ApJS..268....4F. 
  7. ↑ 7.0 7.1 7.2 7.3 Soubiran, C. et al. (July 1, 2022), "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys", Astronomy and Astrophysics 663: A4, doi:10.1051/0004-6361/202142409, ISSN 0004-6361, Bibcode: 2022A&A...663A...4S. 
  8. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014), "A catalog of rotational and radial velocities for evolved stars. V. Southern stars", Astronomy and Astrophysics 561: A126, doi:10.1051/0004-6361/201220762, Bibcode: 2014A&A...561A.126D. 
  9. ↑ "bet Aps". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=bet+Aps. 
  10. ↑ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R 
  11. ↑ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 . The radius (R*) is given by:
    2⋅R*=(47.7⋅2.09⋅10−3) AU0.0046491 AU/R⨀≈22⋅R⨀
  12. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, archived from the original on 2012-03-18, https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16 
  13. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日



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