Shirt a Phobia

Sample Page

Beta Circini is the second-brightest star in the constellation of Circinus. Its name is a Bayer designation that is Latinized from β Circini, and abbreviated Beta Cir or β Cir. The star has an apparent visual magnitude of approximately 4.07,[1] which is bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 35.8 mas as seen from the Earth, it is located at a distance of 91.1 light-years (27.9 pc) from the Sun.

With a stellar classification of A3 Va,[3] this is an A-type main-sequence star fusing atoms of hydrogen into helium at its core. It is between 370 and 500 million years old[6] and is spinning with a projected rotational velocity of 59 km/s.[4] The star has 1.96[6] times the mass of the Sun and around 1.9[7] times the Sun’s radius. The star is radiating 19[1] times the Sun’s luminosity from its photosphere at an effective temperature of 8,676 K.[6] It has one known sub-stellar companion.

Substellar companion

Beta Circini b is a distant brown dwarf companion orbiting the host star at a distance of 6,656 AU. It was detected as a proper motion companion to Beta Circini in 2015 by L.C. Smith and collaborators. Using BHAC15 isochrones, its mass is estimated at 0.056 M☉, or 59 MJ. It has a stellar classification of L1 and a temperature of 2,084 K (1,811 °C).[6]

The β Circini planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination
(°) 		Radius
b 58.7±7.3 MJ 6,656 — — — —

References

  1. ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012). “XHIP: An extended hipparcos compilation”. Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL…38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d 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.
  3. ^ a b Gray, R. O.; et al. (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.
  4. ^ a b c Hoffleit, D.; Warren, Jr., W. H. “HR 5670, database entry”. The Bright Star Catalogue (5th Revised Ed. (Preliminary Version) ed.). CDS. ID V/50. Retrieved September 5, 2008.
  5. ^ Evans, D. S (1967). “The Revision of the General Catalogue of Radial Velocities”. Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS…30…57E.
  6. ^ a b c d e f g h Smith, L. C.; et al. (2015). “Discovery of a brown dwarf companion to the A3V star β Circini”. Monthly Notices of the Royal Astronomical Society. 454 (4): 4476–4483. arXiv:1509.09226. Bibcode:2015MNRAS.454.4476S. doi:10.1093/mnras/stv2290. hdl:2299/16835. S2CID 18570256.
  7. ^ a b Cotten, Tara H.; Song, Inseok (2016-07-01). “A Comprehensive Census of Nearby Infrared Excess Stars”. The Astrophysical Journal Supplement Series. 225 (1): 15. arXiv:1606.01134. Bibcode:2016ApJS..225…15C. doi:10.3847/0067-0049/225/1/15. ISSN 0067-0049. Beta Circini’s database entry at VizieR.
  8. ^ Song, Inseok; et al. (February 2001). “Ages of A-Type Vega-like Stars from uvbyβ Photometry”. The Astrophysical Journal. 546 (1): 352–357. arXiv:astro-ph/0010102. Bibcode:2001ApJ…546..352S. doi:10.1086/318269. S2CID 18154947.
  9. ^ “* bet Cir”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 5, 2008.