V692 Coronae Australis

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V692 Coronae Australis
Corona Australis constellation map.svg
Red circle.svg
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]
Distance 1,900 ± 100  ly
(570 ± 30  pc)
Absolute magnitude  (MV)−6.44 [9] or −2.26 [10]
Details
Mass 7.35±0.48 [11]   M☉
Radius 12.6±0.7 [12]   R☉
Luminosity (bolometric)4,181 [11]   L☉
Surface gravity (log g)3.52+0.33
−0.14 [1]   cgs
Temperature 17,061+1,474
−1,357 [13]   K
Rotational velocity (v sin i)212±9 [14]  km/s
Age 31.6±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
SIMBAD data

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 V692CrALightCurve.png
A light curve for V692 Coronae Australis, plotted from Hipparcos data

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]

Related Research Articles

<span class="mw-page-title-main">R Coronae Australis</span> Star in the constellation Corona Australis

R Coronae Australis is a variable binary system in the constellation Corona Australis. It has varied between magnitudes 10 and 14.36. A small reflection/emission nebula NGC 6729 extends from the star towards SE. It is also the brightest feature of the Coronet Cluster, therefore sometimes called R CrA Cluster.

HD 92845 is a probable astrometric binary in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocity of 4.5 km/s.

HD 152010 is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.48, placing it near the max visibility for the naked eye. Located 1,006 light yearsaway, the object is approaching the Solar System with a heliocentric radial velocity of −15 km/s.

<span class="mw-page-title-main">Beta Coronae Australis</span> Star in the constellation Corona Australis

Beta Coronae Australis, Latinized from β Coronae Australis, is a solitary star 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. The star is located around 470 light years distant from the Sun based on parallax, and is drifting further away with a radial velocity of 2.7 km/s. At its current distance, Beta CrA's brightness is diminished by 0.29 magnitudes due to interstellar dust.

<span class="mw-page-title-main">Theta Coronae Australis</span> Star in the constellation Corona Australis

Theta Coronae Australis, Latinized from θ Coronae Australis, is a solitary yellow-hued star located in the southernconstellation Corona Australis. It has an apparent magnitude of 4.61, making it readily visible to the naked eye. Gaia DR3 parallax measurements place it 530 light years away and it is currently drifting closer with a somewhat constrained heliocentric radial velocity of −2.1 km/s. At its current distance, Theta CrA's brightness is diminished by three-tenths of a magnitudes due to interstellar dust. It has an absolute magnitude of −1.54.

<span class="mw-page-title-main">Mu Coronae Australis</span> Star in the constellation Corona Australis

Mu Coronae Australis, Latinized from μ Coronae Australis, is a solitary yellow-hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 5.22, making it faintly visible to the naked eye. Gaia DR3 parallax measurements put it 386 light years away and is currently approaching the Solar System with a heliocentric radial velocity of −18.2 km/s. At its current distance, Mu CrA's brightness is diminished by 0.31 magnitudes due to interstellar dust. It has an absolute magnitude of −0.22.

Kappa1 Coronae Australis, Latinized from κ1 Coronae Australis, is a star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility.

Kappa<sup>2</sup> Coronae Australis Star in the constellation Corona Australis

Kappa2 Coronae Australis, Latinized from κ2 Coronae Australis, is the primary of a probable binary system located in the southern constellation Corona Australis. It is visible to the naked eye as a bluish-white hued star with an apparent visual magnitude of 5.59. The distance to this star is roughly 710 light years based on Gaia DR3 parallax measurements. The radial velocity is poorly constrained, but the star appears to be moving closer with a radial velocity of around −15 km/s. At its current distance, Kappa2 CrA's brightness is diminished by 0.45 magnitudes due to interstellar dust.

17 Delphini is a solitary star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64 and apparent magnitude of 5.18, allowing it to be faintly seen with the naked eye. Located 517 light years away, it is approaching the Solar System with a heliocentric radial velocity of −10.2 km/s.

<span class="mw-page-title-main">Xi Octantis</span> Slowly pulsating B dwarf in Octans

Xi Octantis, Latinized from ξ Octantis, is a solitary variable star in the southern circumpolar constellation Octans. It has an apparent magnitude of about 5.3, allowing it to be faintly seen with the naked eye; however, this varies slightly. Located 514 light years away, the object is receding with a heliocentric radial velocity of 22 km/s.

15 Delphini is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.99, allowing it to be faintly seen with the naked eye. The star is relatively close at a distance of 99 light years but is receding with a heliocentric radial velocity of 4.1 km/s.

<span class="mw-page-title-main">23 Leonis Minoris</span> Star in the constellation of Leo Minor

23 Leonis Minoris is a solitary, bluish-white hued star located in the northern constellation Leo Minor. It is positioned 7° south and 11" west from β Leonis Minoris. It is rarely called 7 H. Leonis Minoris, which is its Hevelius designation.

HD 59640 is a solitary white hued star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.48, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object at a distance of 262 light years and it is receding with a heliocentric radial velocity of 18.4 km/s. At its current distance, HD 59640's brightness is diminished by three tenths of a magnitude due to interstellar dust.

<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.

<span class="mw-page-title-main">V718 Coronae Australis</span> Slow irregular variable; Corona Australis

V718 Coronae Australis is a solitary variable star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a red-hued point of light with an apparent magnitude of 5.43. Gaia DR3 parallax measurements imply a distance of 630 light years and it is currently receding with a heliocentric radial velocity of 28.5 km/s. At its current distance V718 CrA's brightness is diminished by 0.37 magnitudes due to interstellar dust and it has an absolute magnitude of −1.03.

<span class="mw-page-title-main">34 Leonis Minoris</span> Star in the constellation Leo Minor

34 Leonis Minoris, also known as HD 91365 or 11 H. Leonis Minoris is a solitary star located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.58. Gaia DR3 parallax measurements imply a distance of 510 light-years, and it is currently receding with a poorly constrained heliocentric radial velocity of 7 km/s. At its current distance, 34 LMi's brightness is diminished by interstellar extinction of 0.16 magnitudes and it has an absolute magnitude of −1.02.

<span class="mw-page-title-main">V701 Coronae Australis</span> Delta Scuti variable; Corona Australis

V701 Coronae Australis, or simply V701 CrA, is a solitary, yellowish-white hued variable star located in the southern constellation Corona Australis. It has an average apparent magnitude of 5.72, making it faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 213 light-years based on Gaia DR3 parallax measurements, and it is currently receding with a poorly constrained heliocentric radial velocity of 4 km/s. At its current distance, V701 CrA's brightness is diminished by a quarter of a magnitude due to extinction and it has an absolute magnitude of +1.55.

<span class="mw-page-title-main">HD 33541</span> Spectroscopic binary; Camelopardalis

HD 33541, also known as HR 1683, is a white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.83, making it faintly visible to the naked eye. Gaia DR3 parallax measurements imply a distance of 358 light years and it is currently receding with a heliocentric radial velocity of 9.9 km/s. At its current distance HD 33541's brightness is diminished by 0.16 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.58.

<span class="mw-page-title-main">HD 28780</span> A-type star in the constellation Camelopardalis

HD 28780, also known as HR 1440, is a solitary white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.91, making it faintly viisble to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 488 light-years, and it is currently drifting closer with a heliocentric radial velocity of −22.6 km/s. At its current distance, HD 28780's brightness is diminished by 0.33 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.26.

<span class="mw-page-title-main">HD 174430</span> B-type giant in the constellation Telescopium

HD 174430, also designated as HR 7093 or rarely 32 G. Telescopii, is a solitary blue-hued star located in the southern constellation Telescopium near Kappa Telescopii. It has an apparent magnitude of 6.29, placing it near the limit for naked eye, even under ideal conditions. The object is located relatively far at a distance of 1,140 light-years based on Gaia DR3 parallax measurements, but it is drifitng closer with a heliocentric radial velocity of −23 km/s. At its current distance, HD 174430's brightness is diminished by 0.32 magnitudes due to interstellar extinction and it has an absolute magnitude of −1.80.

References

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  22. ↑ Renson, P.; Manfroid, J. (March 1980). "Nouvelle Recherche de Periodes d'etoiles Ap Observees a l'ESO-IV". Information Bulletin on Variable Stars. 1755: 1. Bibcode:1980IBVS.1755....1R. ISSN   0374-0676.
  23. ↑ Kholopov, P. N.; Samus', N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (November 1981). "66th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2042: 1. Bibcode:1981IBVS.2042....1K. ISSN   0374-0676.
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