Beta Phoenicis

Beta Phoenicis
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 01h 06m 05.03952s[1]
Declination −46° 43′ 06.2785″[1]
Apparent magnitude (V) 3.30[2]
(4.10 / 4.19)[3]
Characteristics
Spectral type G8III + G8III:[4]
Astrometry
Proper motion (μ) RA: −80.81[1] mas/yr
Dec.: +34.97[1] mas/yr
Parallax (π)17.63 ± 2.09 mas[5]
Distanceapprox. 190 ly
(approx. 57 pc)
Absolute magnitude (MV)0.29[6]
Orbit[7]
Period (P)170.7±5.0 yr
Semi-major axis (a)0.946±0.016″
Eccentricity (e)0.718±0.016
Inclination (i)144.0±1.5°
Longitude of the node (Ω)126.4±3.5°
Periastron epoch (T)2003.41±0.10
Argument of periastron (ω)
(secondary)		293.5±4.4°
Details
Mass2.7–3[8] M☉
Radius~14/~14[8][a] R☉
Luminosity~100/~100[8] L☉
Temperature5,090[6] K
Rotational velocity (v sin i)11.4±0.6[6] km/s
Other designations
CD−47 324, HD 6595, HIP 5165, HR 322, SAO 215365.[9]
Database references
SIMBADdata

Beta Phoenicis (β Phoenicis, β Phe) is a binary star in the constellation Phoenix. Its apparent magnitude is 3.30,[2] meaning that it can be seen with the naked eye (see Bortle scale).

The distance to Beta Phoenicis is poorly known. The original reduction of the Hipparcos satellite's data yielded a parallax value of 16 milliarcseconds, yet its standard error was larger than the parallax value itself.[10] An individual note in the Hipparcos catalogue provided a more likely parallax of 17.63±2.09 mas, corresponding to a distance of 185±22 light-years,[5] consistent with the expected distance implied by the absolute visual magnitude of a G8 giant.[8] The new reduction of the Hipparcos data gave 0.12 ± 14.62 milliarcseconds, still unusable.[1] The General Catalogue of Trigonometric Parallaxes, an older catalogue of ground-based parallaxes, lists the parallax as 20 ± 16 milliarcseconds, corresponding to about 200 light-years (61 pc).[11]

Beta Phoenicis is a relatively wide visual binary consisting of two G-type giant stars, both with spectral types of G8III.[4] The two orbit each other every 170.7 years and have a relatively eccentric orbit. The stars are separated by almost one arcsecond.[7]

Notes

  1. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .

References

  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-03-11.
  4. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  5. ^ a b "Hipparcos notes: General notes". vizier.cds.unistra.fr. Retrieved 2024-07-20.
  6. ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  7. ^ a b Argyle, R. W.; et al. (May 2015). "Micrometric measures and orbits of southern visual double stars". Astronomische Nachrichten. 336 (4): 378–387. Bibcode:2015AN....336..378A. doi:10.1002/asna.201412166.
  8. ^ a b c d "Beta Phoenicis". stars.astro.illinois.edu. Retrieved 2024-07-20.
  9. ^ "* bet Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-02.
  10. ^ Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
  11. ^ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The General Catalogue of Trigonometric [Stellar] Parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Bibcode:1995gcts.book.....V.