Back Beta Coronae Australis AST Beta de la Corona Austral Catalan Βήτα Νοτίου Στεφάνου Greek Beta Coronae Australis Spanish بتا تاج جنوبی Persian Beta Coronae Australis French みなみのかんむり座ベータ星 Japanese Beta Coronae Australis NB Beta Coronae Australis Polish Beta Coronae Australis Portuguese

Beta Coronae Australis

Beta Coronae Australis
Location of β CrA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 10m 01.75580s[1]
Declination −39° 20′ 26.8644″[1]
Apparent magnitude (V) 4.10±0.01[2]
Characteristics
Spectral type K0 II/III CN1.5[3]
U−B color index +1.07[4]
B−V color index +1.20[4]
R−I color index +0.61[4]
Astrometry
Radial velocity (Rv)2.7±0.7[5] km/s
Proper motion (μ) RA: +4.37 mas/yr[1]
Dec.: −36.65 mas/yr[1]
Parallax (π)6.88 ± 0.25 mas[1]
Distance470 ± 20 ly
(145 ± 5 pc)
Absolute magnitude (MV)−1.71[6]
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
β CrA, 46 G. Coronae Australis[13], CD−39°13146, CPD−39°8327, GC 26380, HD 178345, HIP 94160, HR 7259, SAO 211005, PPM 298639[14]
Database references
SIMBADdata

Beta Coronae Australis (Beta CrA), Latinized from β Coronae Australis, is a solitary star[15] located in the southern constellation Corona Australis. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.10.[2] The star is located around 470 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of 2.7 km/s.[5] 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,[3] 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 anamolous 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]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Blackwell1998 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference sb0 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
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