Beta Pyxidis
Location of β Pyxidis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.954[2] |
| Characteristics | |
| Spectral type | G7II/III[3] |
| U−B color index | +0.646[2] |
| B−V color index | +0.935[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.4[4] km/s |
| Proper motion (μ) | RA: +9.84[1] mas/yr Dec.: −20.80[1] mas/yr |
| Parallax (π) | 7.84±0.19 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.196±0.093[5] |
| Details[5] | |
| Mass | 3.77±0.18 M☉ |
| Radius | 20±1 R☉ |
| Luminosity | 283±25 L☉ |
| Surface gravity (log g) | 2.68±0.09 cgs |
| Temperature | 5,283±59 K |
| Metallicity [Fe/H] | −0.06±0.053 dex |
| Rotational velocity (v sin i) | 11.8[6] km/s |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
Beta Pyxidis, Latinized from β Pyxidis, is a double star[7] located in the southern constellation Pyxis. It has an apparent visual magnitude of 3.954, making it the second brightest star in that faint constellation. Based upon parallax measurements, the star is an estimated 420 light-years (128 parsecs) from the Earth.[1]
The spectrum matches a bright giant or giant star of stellar classification G7II-III.[3] It has 3.8 times the mass of the Sun but has expanded to 20 times the Sun's radius. The effective temperature of the star's outer envelope is about 5,283 K,[5] giving it the characteristic yellow hue of a G-type star.[8] Beta Pyxidis has an unusually high rate of spin for an evolved star of this type, showing a projected rotational velocity of 11.8 km/s. One possible explanation is that it may have engulfed a nearby giant planet, such as a hot Jupiter.[6]
In 2010, the star was among a survey of massive, lower effective temperature supergiants in an attempt to detect a magnetic field. This star may have a longitudinal magnetic field with a strength of less than a Gauss.[9] It is a young disk star system with space velocity components, [U, V, W] = [–11.0, +11.8, –2.2] km/s.[10] There is a magnitude 12.5 optical companion, located at an angular separation of 12.7 arcseconds and a position angle of 118° as of the year 1943.[11]
Naming
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Dog, refers to an asterism consisting of β Pyxidis, e Velorum, f Velorum, α Pyxidis, γ Pyxidis and δ Pyxidis. Consequently, β Pyxidis itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[12]
References
Page Template:Reflist/styles.css has no content.
- ^ a b c d e f Page Module:Citation/CS1/styles.css has no content.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 c Page Module:Citation/CS1/styles.css has no content.Gutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile. 1. Publicaciones Universidad de Chile, Department de Astronomy: 1–17. Bibcode:1966PDAUC...1....1G.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ Page Module:Citation/CS1/styles.css has no content.Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". Proceedings from IAU Symposium no. 30, Determination of Radial Velocities and their Applications. University of Toronto: Dordrecht, D. Reidel Publishing Co. Bibcode:1967IAUS...30...57E.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (2022-01-01). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Beta Pyxidis' database entry at VizieR.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Rodrigues da Silva, R.; et al. (March 2015). "On the Nature of Rapidly Rotating Single Evolved Stars". The Astrophysical Journal. 801 (1): 6. arXiv:1503.03447. Bibcode:2015ApJ...801...54R. doi:10.1088/0004-637X/801/1/54. S2CID 119271718. 54.
- ^ a b Page Module:Citation/CS1/styles.css has no content."bet Pyx". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-07-29.
{{cite web}}: Invalid|mode=Script error: No such module "Citation mode".(help)CS1 maint: postscript (link) - ^ Page Module:Citation/CS1/styles.css has no content."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, retrieved 2012-01-16
- ^ Page Module:Citation/CS1/styles.css has no content.Grunhut, J. H.; et al. (November 2010), "Systematic detection of magnetic fields in massive, late-type supergiants", Monthly Notices of the Royal Astronomical Society, 408 (4): 2290–2297, arXiv:1006.5891, Bibcode:2010MNRAS.408.2290G, doi:10.1111/j.1365-2966.2010.17275.x, S2CID 118564860
- ^ Page Module:Citation/CS1/styles.css has no content.Eggen, O. J. (1994). "Photometry of F-K type bright giants and supergiants. 3: The luminosity, reddening, and heavy element abundance of GK stars". The Astrophysical Journal. 107 (6): 2184–2210, 2205. Bibcode:1994AJ....107.2184E. doi:10.1086/117030.
- ^ Page Module:Citation/CS1/styles.css has no content.Worley, C. E.; Douglas, G. G. (November 1997), "The Washington double star catalogue (WDS, 1996.0)", Astronomy & Astrophysics Supplement Series, 125 (3): 523, Bibcode:1997A&AS..125..523W, doi:10.1051/aas:1997239
- ^ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日 Script error: No such module "webarchive".
