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V692 Coronae Australis

V692 Coronae Australis
Location of V692 CrA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 13m 12.69843s[1]
Declination −41° 20′ 09.9972″[1]
Apparent magnitude (V) 5.46[2] (5.46 - 5.51)[3]
Characteristics
Spectral type B2 III[4] or B1.5 IIIp[5]
B−V color index −0.17[6]
Variable type SX Arietis[7]
Astrometry
Radial velocity (Rv)−15.3±2.8[8] km/s
Proper motion (μ) RA: −2.050 mas/yr[1]
Dec.: −6.210 mas/yr[1]
Parallax (π)1.7423 ± 0.0977 mas[1]
Distance1,900 ± 100 ly
(570 ± 30 pc)
Absolute magnitude (MV)−6.44[9] or −2.26[10]
Details
Mass7.35±0.48[11] M☉
Radius12.6±0.7[12] R☉
Luminosity (bolometric)4,181[11] L☉
Surface gravity (log g)3.52+0.33
−0.14[1] cgs
Temperature17,061+1,474
−1,357[13] K
Rotational velocity (v sin i)212±9[14] km/s
Age31.6±5.1[15] Myr
Other designations
3 G. Corona Australis[16], V692 CrA, CD−41°12534, CPD−41°8620, GC 24824, HD 166596, HIP 89290, HR 6804, SAO 228815[17]
Database references
SIMBADdata

V692 Coronae Australis (HD 166596; HR 6804; 3 G. CrA), or simply V692 CrA, is a whitish-blue hued variable star located in the southern constellation Corona Australis. It has a maximum apparent magnitude of 5.46,[2] making it faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,900 light years based on Gaia DR3 parallax measurements,[1] but it is approaching the Solar System with a fairly constrained heliocentric radial velocity of −15.3 km/s.[8] At its current distance, V692 CrA's brightness is heavily diminished by 0.46 magnitudes due to extinction due to interstellar dust.[18] Its absolute magnitude depends on the source: Westin (1985) gave a value of −6.44[9] while the extended Hipparcos catalogue gave a value of −2.26.[10]

A light curve for V692 Coronae Australis, plotted from Hipparcos data[19]

Astronomers Carlos and Mercedes Jaschek along with a colleague listed HD 166596 as a Be star in 1964.[20] However, its status as an Ap star was not observed until 1979 by astronomers N. Vogt and A.M Faundez.[21] A year later, HD 166596 was observed to be variable and it had a period of 1.67 days.[22] In 1981, its variability was confirmed and it was given the variable star designation V692 Coronae Australis—the 692nd variable star in Corona Australis.[23] The star might have a shorter period of 49.8 hours.[7]

V692 CrA has a stellar classification of B2 III[4] or B1.5 IIIp,[5] both indicating that it is a slightly evolved B-type giant star. The second classification indicates that V692 CrA has peculiarities in its spectrum. It has 7.35 times the mass of the Sun[11] and 12.6 times the Sun's radius.[12] It radiates at a bolometric luminosity 4,181 times that of the Sun[11] from its photosphere at an effective temperature of 17,061 K.[13] V692 CrA is estimated to be 31.6 million years old[15] and it spins rapidly with a projected rotational velocity of 212 km/s.[14]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 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. ^ Cite error: The named reference VSX was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Rountree1991 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Westin1985 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  11. ^ a b c d Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Gulati1989 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Brown1997 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Jaschek1964 was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference Vogt1979 was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference Renson1980 was invoked but never defined (see the help page).
  23. ^ Cite error: The named reference Kholopov1981 was invoked but never defined (see the help page).

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