WZ Doradus

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WZ Doradus
Dorado constellation map.svg
Red circle.svg
Location of WZ Doradus on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 05h 07m 34.02686s [1]
Declination −63° 23 58.8474 [1]
Apparent magnitude  (V)5.20 - 5.32 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type M3 III [4]
U−B color index +1.85 [5]
B−V color index +1.65 [5]
Variable type SRb [2]
Astrometry
Radial velocity (Rv)19.3±2.8 [6]  km/s
Proper motion (μ)RA: +13.210  mas/yr [1]
Dec.: −44.813  mas/yr [1]
Parallax (π)5.6282 ± 0.1116  mas [1]
Distance 580 ± 10  ly
(178 ± 4  pc)
Absolute magnitude  (MV)−1.00 [7]
Details
Mass 1.4 [8]   M
Radius 88.3+6.6
10.0
[9]   R
Luminosity 1,248±47 [9]   L
Surface gravity (log g)0.50 [10]   cgs
Temperature 3,603±125 [10]   K
Other designations
21 G. Doradus [11] , WZ Dor, CD−63°188, CPD−63°420, FK5  2389, GC  6314, HD  33684, HIP  23840, HR  1695, SAO  249198, TIC  55298910 [12]
Database references
SIMBAD data

WZ Doradus (HD 33684; HR 1695; 21 G. Doradus) is a solitary red-hued variable star [13] located in the southern constellation Dorado. It has an average apparent magnitude of 5.21, [14] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 580 light-years [1] and it is currently receding with a heliocentric radial velocity of 19.3  km/s . [6] At its current distance, WZ Doradus is diminished by two-tenths of a magnitude due to interstellar extinction and it has an absolute magnitude of −1.00. [7]

HD 33684 was first observed to vary in brightness by astronomer P. M. Corben in 1971. [15] It was said to have an amplitude of 0.18 magnitudes. A year later, HD 33684 was given the variable star designation WZ Doradus. [16] It was again observed in 1973 by Olin J. Eggen and he noticed that it varied within 40 days. [17] A 1998 survey found no strong emissions indicating dust around the star. [18] Another survey also found no technetium in its spectrum. [19] WZ Doradus is a semiregular variable of subtype SRb that varies between 5.2 and 5.32 within an average period of 40 days. [2] Tabur et al. (2009) found two periods for the star after it was widely believed to only have one period. [20]

WZ Doradus variability periods [20]
Amplitude (mag)Period (days)
0.04226.0
0.02644.6
A light curve for WZ Doradus, plotted from data published by Tabur et al. WZDorLightCurve.png
A light curve for WZ Doradus, plotted from data published by Tabur et al.

WZ Doradus has a stellar classification of M3 III, [4] indicating that it is an evolved red giant. It is currently on the asymptotic giant branch, [3] generating energy via the fusion of hydrogen and helium shells around an inert carbon core. As a result of its evolved state, it has expanded to 88.3 times the radius of the Sun [9] and it now radiates 1,248 times the luminosity of the Sun [9] from its enlarged photosphere at an effective temperature of 3,603  K . [10]

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References

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