Astronomy:Beta Phoenicis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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) | 0.12 ± 14.62[1] mas |
| Absolute magnitude (MV) | 0.29[5] |
| Orbit[6] | |
| 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 | ~2.5/~2.5 M☉ |
| Luminosity | ~100/~100 L☉ |
| Temperature | 5,090[5] K |
| Rotational velocity (v sin i) | 11.4±0.6[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[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).[9]
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.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 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. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ 4.0 4.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 5.0 5.1 5.2 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, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 6.0 6.1 Argyle, R. W. et al. (May 2015). "Micrometric measures and orbits of southern visual double stars". Astronomische Nachrichten 336 (4): 378–387. doi:10.1002/asna.201412166. Bibcode: 2015AN....336..378A.
- ↑ "* bet Phe". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+bet+Phe.
- ↑ Perryman, M. A. C. (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.
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