Astronomy:Beta Coronae Australis

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Short description: Star in the constellation Corona Australis
Beta Coronae Australis
Location of β CrA (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Corona Australis[1]
Right ascension  19h 10m 01.75580s[2]
Declination −39° 20′ 26.8644″[2]
Apparent magnitude (V) 4.10±0.01[3]
Characteristics
Spectral type K0 II/III CN1.5[4]
U−B color index +1.07[5]
B−V color index +1.20[5]
R−I color index +0.61[5]
Astrometry
Radial velocity (Rv)2.7±0.7[6] km/s
Proper motion (μ) RA: +4.37[2] mas/yr
Dec.: −36.65[2] mas/yr
Parallax (π)6.88 ± 0.25[2] mas
Distance470 ± 20 ly
(145 ± 5 pc)
Absolute magnitude (MV)−1.71[1]
Details
Mass5.17±0.26[7] M☉
Radius38.5±1.9[8] R☉
Luminosity614±33[9] L☉
Surface gravity (log g)1.26[10] cgs
Temperature4,575±55[11] K
Metallicity [Fe/H]+0.24[10] dex
Rotational velocity (v sin i)6.2±2[12] km/s
Other designations
Alqubba, β CrA, CD−39°13146, CPD−39°8327, GC 26380, HD 178345, HIP 94160, HR 7259, SAO 211005, PPM 298639[13]
Database references
SIMBADdata

Beta Coronae Australis, also named Alqubba,[14] is a solitary star[15] located in the southern constellation Corona Australis. Its Bayer designation is Latinized from β Coronae Australis, and abbreviated Beta CrA or β CrA. This body is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.10.[3] The star is located around 470 light years distant from the Sun based on parallax,[2] and is drifting further away with a radial velocity of 2.7 km/s.[6] At its current distance, Beta CrA's brightness is diminished by 0.29 magnitudes due to interstellar dust.[16]

Beta CrA has a stellar classification of K0 II/III CN1.5,[4] indicating that it is an evolved K-type star with the blended luminosity class of a bright giant and a regular giant star. The suffix CN1.5 indicates that the object has an anomalous overabundance of cyano radicals in its spectrum, making it a CN star. Having exhausted the supply of hydrogen at its core, the star has expanded to 39 times the Sun's girth.[9] It has 5.17 times the mass of the Sun shines with a luminosity 614 times that of the Sun[9] from its photosphere at a surface temperature of 4,575 K.[11] Beta CrA is metal enriched (174% solar iron abundance[10]) and spins modestly with a projected rotational velocity of 6.2 km/s.[12]

Al-Qubba (القُبَّة), the dome or domed tent, is a traditional Arabic name for Corona Australis. The IAU Working Group on Star Names adopted the name Alqubba for this star on 13 August 2026.[14]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Template:Cite New HIP red.
  3. ↑ 3.0 3.1 Høg, E. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  5. ↑ 5.0 5.1 5.2 Johnson, H. L. et al. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ Kervella, Pierre et al. (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ Kervella, P. et al. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 9.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. ↑ 10.0 10.1 10.2 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  11. ↑ 11.0 11.1 Blackwell, D. E.; Lynas-Gray, A. E. (May 1998). "Determination of the temperatures of selected ISO flux calibration stars using the Infrared Flux Method". Astronomy and Astrophysics Supplement Series 129 (3): 505–515. doi:10.1051/aas:1998202. ISSN 0365-0138. Bibcode: 1998A&AS..129..505B. 
  12. ↑ 12.0 12.1 De Medeiros, J. R. et al. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  13. ↑ "bet CrA". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=bet+CrA. 
  14. ↑ 14.0 14.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  16. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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