Theta Crateris
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 36m 40.909s[1] |
| Declination | −09° 48′ 08.002″[1] |
| Apparent magnitude (V) | 4.70[2] |
| Characteristics | |
| Spectral type | B9.5 Vn[3] |
| U−B color index | −0.18[2] |
| B−V color index | −0.08[2] |
| Astrometry | |
| Radial velocity (Rv) | +2.09±3.78[4] km/s |
| Proper motion (μ) | RA: −59.995 mas/yr[1] Dec.: +3.959 mas/yr[1] |
| Parallax (π) | 10.8503±0.1871 mas[1] |
| Distance | 301 ± 5 ly (92 ± 2 pc) |
| Absolute magnitude (MV) | +0.63[5] |
| Details | |
| Mass | 2.79[6] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 107[8] L☉ |
| Surface gravity (log g) | 3.96±0.14[6] cgs |
| Temperature | 11,524±392[6] K |
| Rotational velocity (v sin i) | 212[3] km/s |
| Age | 117[6] Myr |
| Other designations | |
| θ Crt, 21 Crateris, BD−08°3202, FK5 1299, HD 100889, HIP 56633, HR 4468, SAO 138296[9] | |
| Database references | |
| SIMBAD | data |
Theta Crateris is a solitary[10] star in the southern constellation of Crater. Its name is a Bayer designation that is Latinized from θ Crateris and abbreviated Theta Crt or θ Crt. It is a photometric-standard star[11] that is faintly visible to the naked eye with an apparent visual magnitude of 4.70.[2] With an annual parallax shift of 10.85 mas as seen from Earth, it is located approximately 301 light-years (92 pc) from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.07 because of interstellar dust.[5]
This is a B-type main sequence star with a stellar classification of B9.5 Vn,[3] where the 'n' suffix indicates "nebulous" absorption lines due to rapid rotation. It is spinning with a projected rotational velocity of 212 km/s,[3] giving the star an oblate shape with an equatorial bulge that is an estimated 7% larger than the polar radius.[12] The star has 2.79[6] times the mass of the Sun and around 3.1[7] times the Sun's radius. With an age of about 117 million years,[6] it is radiating 107[8] times the solar luminosity from its outer atmosphere at an effective temperature of 11,524 K.[6]
References
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
- 1 2 3 4 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- 1 2 3 4 Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ↑ Becker, Juliette C.; et al. (April 2015), "Extracting Radial Velocities of A- and B-type Stars from Echelle Spectrograph Calibration Spectra", The Astrophysical Journal Supplement Series, 217 (2): 13, arXiv:1503.03874, Bibcode:2015ApJS..217...29B, doi:10.1088/0067-0049/217/2/29, S2CID 33968873, 29.
- 1 2 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- 1 2 3 4 5 6 7 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.
- 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ↑ "tet Crt", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-02-26
- ↑ 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.
- ↑ Stritzinger, Maximilian; et al. (August 2005), "An Atlas of Spectrophotometric Landolt Standard Stars", The Publications of the Astronomical Society of the Pacific, 117 (834): 810–822, arXiv:astro-ph/0504244, Bibcode:2005PASP..117..810S, doi:10.1086/431468, S2CID 14771506.
- ↑ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
External links
- Skuppin, R.; Grewing, M.; Bianchi, L.; de Boer, K. S. (May 1987), "Interstellar absorption lines in the spectra of Theta Crateris and 14 Canum Venaticorum", Astronomy and Astrophysics, 177 (1–2): 228–232, Bibcode:1987A&A...177..228S.
