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).