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).
| 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] |
| Distance | approx. 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 | |
| Mass | 2.7–3[8] M☉ |
| Radius | ~14/~14[8][a] R☉ |
| Luminosity | ~100/~100[8] L☉ |
| Temperature | 5,090[6] K |
| Rotational velocity (v sin i) | 11.4±0.6[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
- .
References
edit- ^ 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.
- ^ 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.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-03-11.
- ^ 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.
- ^ a b "Hipparcos notes: General notes". vizier.cds.unistra.fr. Retrieved 2024-07-20.
- ^ 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.
- ^ 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.
- ^ a b c d "Beta Phoenicis". stars.astro.illinois.edu. Retrieved 2024-07-20.
- ^ "* bet Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-02.
- ^ Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ 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.