V701 Coronae Australis

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V701 Coronae Australis
Corona Australis constellation map.svg
Red circle.svg
Location of HD 168592 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 03m 17.69619s [1]
Declination −38° 15′ 11.3335″ [1]
Apparent magnitude  (V)5.69 to 5.73 [2]
Characteristics
Spectral type F2 III/IV [3] or F0 IIIn [4]
B−V color index +0.32 [5]
Variable type δ Scuti [2]
Astrometry
Radial velocity (Rv)4±7.4 [6]  km/s
Proper motion (μ)RA: +12.794  mas/yr [1]
Dec.: +14.271  mas/yr [1]
Parallax (π)15.2952 ± 0.0559  mas [1]
Distance 213.2 ± 0.8  ly
(65.4 ± 0.2  pc)
Absolute magnitude  (MV)+1.55 [7]
Details
Mass 1.83+0.07
−0.06 [8]   M☉
Radius 2.85±0.14 [9]   R☉
Luminosity 17.5+0.2
−0.1 [1]   L☉
Surface gravity (log g)3.75±0.12 [10]   cgs
Temperature 7,046±240 [11]   K
Metallicity [Fe/H]−0.21 [12]   dex
Rotational velocity (v sin i)265 [13]  km/s
Age 1.25 [11]   Gyr
Other designations
40 G. Coronae Australis [14] , V701 CrA, CD−38°13300, CPD−38°7685, GC  26177, HD  176723, HIP  93552, HR  7197, SAO  210859 [15]
Database references
SIMBAD data

V701 Coronae Australis (HD 176723; HR 7197; 40 G. Coronae Australis), or simply V701 CrA, is a solitary, [16] yellowish-white hued variable star located in the southern constellation Corona Australis. It has an average apparent magnitude of 5.72, [17] 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, [1] and it is currently receding with a poorly constrained heliocentric radial velocity of 4  km/s . [6] At its current distance, V701 CrA's brightness is diminished by a quarter of a magnitude due to extinction [18] and it has an absolute magnitude of +1.55. [7]

A light curve for V701 Coronae Australis, plotted from TESS data V701CrALightCurve.png
A light curve for V701 Coronae Australis, plotted from TESS data

The object was first suspected to be variable in 1990. The variations matched that of δ Scuti variables. [20] Three years later, it was confirmed to be variable and was given the variable star designation V701 Coronae Australis. [21] It ranges from magnitude 5.69 to 5.73 [2] within 3.25 hours. [22]

V701 CrA has a stellar classification of F2 III/IV, [3] indicating that it is an evolved F-type star with the blended luminosity class of a subgiant and giant star. It has also been given a class of F0 IIIn, [4] indicating broad or nebulous absorption lines due to rapid rotation. It has 1.83 times the mass of the Sun [8] and a slightly enlarged radius of 2.85  R☉. [9] It radiates 17.5 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 7,046  K . [11] The star spins rapidly with a projected rotational velocity of 265  km/s , [13] which causes it to have an equatorial bulge that is 26% larger than the poles. [23] It is metal deficient with an iron abundance 62% that of the Sun ([Fe/H] = −0.21) [12] and it is estimated to be 1.25 billion years old. [11] V701 CrA was considered to be a chemically peculiar star and was given a class of FpSr. Its peculiarity is now considered to be doubtful. [24]

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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<span class="mw-page-title-main">HD 170642</span> A-type dwarf; Corona Australis

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<span class="mw-page-title-main">HD 172991</span> Hot/cold binary; Corona Australis

HD 172991, also known as HR 7031 or rarely 20 G. Coronae Australis, is a binary star located in the southern constellation Corona Australis. It has a combined apparent magnitude of 5.44, making it faintly visible to the naked eye. The system is located relatively far at a distance of 1,220 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of −17.4 km/s. At its current distance HD 172991's brightness is diminished by magnitudes due to interstellar dust and it has an absolute magnitude of −2.56.

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

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<span class="mw-page-title-main">HD 167096</span> Binary star; Corona Australis

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<span class="mw-page-title-main">QQ Telescopii</span> Delta Scuti variable; Telescopium

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<span class="mw-page-title-main">HD 169853</span> Am star; Corona Australis

HD 169853, also known as HR 6910 or rarely 9 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.62. Gaia DR3 parallax measurements imply a distance of 391 light years, and it is currently approaching the Solar System with a heliocentric radial velocity of −21.3 km/s. At its current distance, HD 169853's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of +0.13.

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