Planet 1902 HS

HS 0907 + 1902 : a new 4 . 2 hr eclipsing dwarf nova

We report on follow-up spectroscopy and photometry of the cataclysmic variable candidate HS 0907+1902 selected from the Hamburg Quasar Survey. B, V , and R photometry obtained during the first observed outburst of HS 0907+1902 (V ≈ 13) reveals deep eclipses (∆V ≈ 2.1 − 2.8) and an orbital period Porb = 4.2 h with the eclipse depth decreasing to the red. The outburst eclipse profiles are symmetr...

Spectroscopy and Component Masses of the Eclipsing Dwarf Nova HS 0907 + 1902

HS0907+1902 was recently discovered to be one of a handful of deeply eclipsing dwarf novae with periods longward of the 2 – 3 hr ‘gap’. This paper presents orbit-resolved spectra and time series photometry of an eclipse. The apparent velocity amplitude of the M-dwarf secondary is K2 = 297 ± 15 km s . The phase of the radial velocities of the Hα emission line wings agrees accurately (for once) w...

Arne Tiselius, 1902-1971.

Leopold Schenk (1840-1902).

Leopold Schenk attained international fame by his contributions to the science of embryology. The first chair of embryology in any medical school was established for him in the University of Vienna. This article briefly describes his life and his work.

Owsei Temkin 1902-2002.