Location of β Caeli (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Caelum |
| Right ascension | 04 42 03.48029 |
| Declination | −37° 08′ 39.4641″ |
| Apparent magnitude (V) | 5.04 |
| Characteristics | |
| Spectral type | F3 V or F3 IV |
| U−B color index | +0.01 |
| B−V color index | +0.38 |
| Astrometry | |
| Radial velocity (Rv) | 28.8±0.8 km/s |
| Proper motion (μ) | RA: +46.59 mas/yr Dec.: +193.56 mas/yr |
| Parallax (π) | 34.88 ± 0.42 mas |
| Distance | 94 ± 1 ly (28.7 ± 0.3 pc) |
| Absolute magnitude (MV) | +2.64 |
| Details | |
| β Cae A | |
| Mass | 1.32 M☉ |
| Radius | 1.3 R☉ |
| Surface gravity (log g) | 4.09 cgs |
| Temperature | 6,763±230 K |
| Metallicity | −0.12 dex |
| Rotational velocity (v sin i) | 97.5±4.9 km/s |
| Age | 1.753 Gyr |
| β Cae B | |
| Mass | 0.19 M☉ |
| Other designations | |
| β Cae, CD−37° 1867, FK5 1130, GJ 176.1, HD 29992, HIP 21861, HR 1503, SAO 195239 | |
| Database references | |
| SIMBAD | data |
Beta Caeli (β Caeli, abbreviated to β Cae) is the Bayer designation for a star in the southern constellation of Caelum. It is a dim star but visible to the naked eye, having an apparent visual magnitude of 5.04. Based upon an annual parallax shift of 4.88 mas as seen from Earth, it is located 94 light years from the Sun. The star is moving away from the Sun with a radial velocity of +28.8 km/s.
This is a probable single-lined spectroscopic binary star system. The visible component has a stellar classification of F3 V or F3 IV, indicating it is either an F-type main-sequence star or a somewhat more evolved subgiant star, respectively. It has an estimated 1.3 times the mass of the Sun and about 1.3 times the Sun's radius. The star is 1.75 billion years old and has a high rate of spin with a projected rotational velocity of around 97.5 km/s.
The companion is likely to be a low-mass (~0.2 M☉) star orbiting about 5 AU from the primary. This object may be the source of the X-ray emission coming from the same location.
References
- ^ van Leeuwen, F. (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.
- ^ Cousins, A. W. J. (1973), "UBV photometry of some southern stars", Monthly Notes of the Astronomical Society of Southern Africa, 32: 11, Bibcode:1973MNSSA..32...11C.
- ^ 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics, 460 (3): 695–708, arXiv:astro-ph/0609258, Bibcode:2006A&A...460..695T, doi:10.1051/0004-6361:20065602, S2CID 16080025.
- ^ 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.
- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- García, Luciano H.; Petrucci, R.; Jofré, E.; Gómez, M. (2022). "High-contrast imaging of HD 29992 and HD 196385 with the Gemini Planet Imager". Monthly Notices of the Royal Astronomical Society. 515 (4): 4999–5008. doi:10.1093/mnras/stac1929.
- "bet Cae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
{{cite web}}: CS1 maint: postscript (link) - ^ Borgniet, Simon; et al. (2017), "Extrasolar planets and brown dwarfs around AF-type stars. IX. The HARPS southern sample", Astronomy & Astrophysics, 599: A57, arXiv:1608.08257, Bibcode:2017A&A...599A..57B, doi:10.1051/0004-6361/201628805, S2CID 118723455.
- García, Luciano H.; Petrucci, R.; Jofré, E.; Gómez, M. (2022), High-contrast imaging of HD 29992 and HD 196385 with GPI, arXiv:2207.07435
External links
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