WR 128

WR 128

A visual band light curve for QT Sagittae, adapted from Antokhin and Cherepashchuk (1985)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Sagitta
Right ascension 19h 48m 32.19686s[2]
Declination +18° 12′ 03.69399″[2]
Apparent magnitude (V) 10.51
Characteristics
Evolutionary stage Wolf-Rayet
Spectral type WN4(h)-w[3]
U−B color index −0.89[4]
B−V color index -0.02[4]
Astrometry
Radial velocity (Rv)100.00[5] km/s
Parallax (π)0.3129 ± 0.0417 mas[2]
Distance2,900+540
−390[6] pc
Absolute magnitude (MV)−3.27[3]
Details
Mass11[3] M☉
Radius2.69[3] R☉
Luminosity166,000[3] L☉
Temperature70,800[3] K
Other designations
QT Sagittae, HD 187282, WR 128, HIP 97456, 2MASS J19483219+1812036
Database references
SIMBADdata

WR 128 is a Wolf–Rayet star located about 9,500 light years away in the constellation of Sagitta. A member of the WN class, WR 128's spectrum resembles that of a WN4 star, but hydrogen is clearly present in the star (hence the h in its spectrum), making it the only known hydrogen-rich WN4 star in the galaxy. However, similar H-rich very early WN stars can be found in the LMC and especially in the SMC, but the only other galactic examples of this are WR 3 and WR 152.[7]

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  2. ^ a b c Cite error: The named reference gaia was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference ducati was invoked but never defined (see the help page).
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