Astronomy:Alpha Phoenicis

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Short description: Orange-hued star in the constellation Phoenix

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Alpha Phoenicis
Phoenix constellation map.svg
Red circle.svg
Location of α Phoenicis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Phoenix
Right ascension  00h 26m 17.06309s[1]
Declination −42° 18′ 21.7712″[1]
Apparent magnitude (V) 2.377[2]
Characteristics
Spectral type K0.5 IIIb[3]
U−B color index +0.903[2]
B−V color index +1.092[2]
Astrometry
Radial velocity (Rv)+74.6[4] km/s
Proper motion (μ) RA: +176.268[1] mas/yr
Dec.: −398.872[1] mas/yr
Parallax (π)39.9183 ± 0.7283[1] mas
Distance82 ± 1 ly
(25.1 ± 0.5 pc)
Absolute magnitude (MV)0.52[5]
Orbit[6]
Period (P)3848.8 days
Semi-major axis (a)103.5 m
Eccentricity (e)0.34
Inclination (i)128.0±5.4°
Longitude of the node (Ω)242.8±3.9°
Periastron epoch (T)2416201.8 HJD
Argument of periapsis (ω)
(primary)		19.8°
Details
Mass1.57[7] M☉
Radius15[8] R☉
Luminosity83[7] L☉
Surface gravity (log g)2.53[3] cgs
Temperature4,436[3] K
Metallicity [Fe/H]−0.73[3] dex
Rotational velocity (v sin i)1.0[9] km/s
Other designations
Ankaa, Nair al Zaurak, Cymbae, Lucida Cymbae, CD−42°116, FK5 12, GCTP 71.00, HIP 2081, HR 99, HD 2261, LTT 231, SAO 215093.[10]
Database references
SIMBADdata

Alpha Phoenicis (α Phoenicis, abbreviated Alpha Phe or α Phe), formally named Ankaa /ˈæŋkə/,[11] with the same pronunciation) is the brightest star in the constellation of Phoenix.

Nomenclature

Alpha Phoenicis is the star's Bayer designation. It also bore the traditional name Ankaa sometime after 1800, from the Arabic العنقاء al-ʽanqāʼ "the phoenix" for the name of the constellation.[11] The International Astronomical Union has formally adopted the Ankaa as the proper name for Alpha Phoenicis.[12]

Medieval Arab astronomers formed the constellation of the dhow (where Phoenix is), so another popular name for the star is Nair al Zaurak[13] from نائر الزورقnayyir az-zawraq "the bright (star) of the skiff". The Latin translation is Cymbae, from lūcida cumbae.[13]

In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 火鳥 (Huǒ Niǎo), meaning Firebird, refers to an asterism consisting of α Phoenicis, ι Phoenicis, σ Phoenicis, ε Phoenicis, κ Phoenicis, μ Phoenicis, λ1 Phoenicis, β Phoenicis and γ Phoenicis . Consequently, α Phoenicis itself is known as 火鳥六 (Huǒ Niǎo liù, English: the Sixth Star of Firebird.)[14]

Description

Alpha Phoenicis is a spectroscopic binary star system with components that orbit each other every 3,848.8 days (10.5 years).[6] The combined stellar classification of the system is K0.5 IIIb,[3] which matches the spectrum of a normal luminosity giant star. It has an apparent visual magnitude of 2.4,[2] so it is somewhat outshone by its first magnitude neighbors Achernar (α Eridani) and Fomalhaut (α Piscis Austrinus). Based upon parallax measurements, this system is at a distance of about 85 light-years (26 parsecs) from the Earth.[15] The interferometry-measured angular diameter of the primary component, after correcting for limb darkening, is 5.25±0.06 mas,[16] which, at its estimated distance, equates to a physical radius of about 15 times the radius of the Sun.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17, Bibcode: 1966PDAUC...1....1G 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G 
  4. ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and Their Applications, Proceedings from IAU Symposium No. 30 (University of Toronto: International Astronomical Union) 30: 57, Bibcode: 1967IAUS...30...57E 
  5. ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C 
  6. ↑ 6.0 6.1 Jancart, S. et al. (October 2005), "Astrometric orbits of SB^9 stars", Astronomy and Astrophysics 442 (1): 365–380, doi:10.1051/0004-6361:20053003, Bibcode: 2005A&A...442..365J 
  7. ↑ 7.0 7.1 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics 633: A34, doi:10.1051/0004-6361/201936360, Bibcode: 2020A&A...633A..34C 
  8. ↑ 8.0 8.1 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:
    [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(10^{-3}\cdot 26\cdot 5.25)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 29.4\cdot R_{\bigodot} \end{align} }[/math]
  9. ↑ Costa, J. M. et al. (February 2002), "The tidal effects on the lithium abundance of binary systems with giant component", Astronomy and Astrophysics 382 (3): 1016–1020, doi:10.1051/0004-6361:20011676, Bibcode: 2002A&A...382.1016C 
  10. ↑ "alf Phe -- Spectroscopic binary", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Alpha+Phoenicis, retrieved 2012-01-09 
  11. ↑ 11.0 11.1 Kunitzsch, Paul; Smart, Tim (2006), A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.), Cambridge, Massachusetts: Sky Pub, ISBN 978-1-931559-44-7 
  12. ↑ Star Names, https://www.iau.org/public/themes/naming_stars/, retrieved 2023-07-13 
  13. ↑ 13.0 13.1 Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 336, https://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA336 
  14. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 27 日
  15. ↑ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V 
  16. ↑ 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 



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