HS 0728+6738

An Eclipsing Cataclysmic Variable Star

HS 0728+6738 is a deeply eclipsing nova‑like cataclysmic variable of the SW Sextantis class, first identified in the Hamburg Quasar Survey. In this close binary, a white dwarf accretes material from its companion via a stable accretion disk. The system’s orbital period is 3.21 hours, and its inclination is ≈ 85°, making it the highest‑inclination SW Sex star known. Its optical and far‑ultraviolet emission lines remain largely unobscured during eclipses, and the light curve shows rapid variability with a period of about 7 minutes, likely linked to the white dwarf’s spin

Photometry & Images

Catalogue Gaia
RA 113.422634402°
DEC 67.537639222°
U --
B --
V --
Parallax (mas) 1.76 ± 0.04
Light curve

TESS Data

sectors20 sectors47 sectors73

AAVSO Data

aavsodataimage

Spectroscopy

Spectrum of HS 0728+6738

References

Rodriguez-Gil P. et al. Time-resolved photometry and spectroscopy of the new deeply-eclipsing SW Sextantis star HS 0728+ 6738 //Astronomy & Astrophysics. – 2004. – Т. 424. – №. 2. – С. 647-655.