Search Publications
EC 11481–2303—a peculiar subdwarf OB star revisited
Rauch, Thomas; Werner, Klaus; Kruk, Jeffrey W.
EC 11481–2303 is a peculiar, hot, high-gravity pre-white dwarf. Previous optical spectroscopy revealed that it is a sdOB star with Teff=41 790 K, log g=5.84, and He/H = 0.014 by number. We present an on-going spectral analysis by means of non-LTE model-atmosphere techniques based on high-resolution, high-S/N optical (VLT-UVES) and ultra…
Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 Å
Sokolov, Nikolay A.
The spectrophotometric variability of the magnetic CP star 56 Arietis (56 Ari) in the ultraviolet spectral region from 1950 to 3200 Å is investigated. This study is based on the archival International Ultraviolet Explorer data obtained at different phases of the rotational cycle. The brightness of 56 Ari is not constant in the investigated wavelen…
Spectral behavior of AM Her and QQ Vul in high and intermediate states in the UV
Sanad, M. R.
We present low resolution UV spectra of two polar systems, AM Her and QQ Vul from the observations taken by the IUE (International Ultraviolet Explorer) of the period between 1978–1996 and 1983–1996 for both systems respectively, to accomplish a large scale study of what happens to the ultraviolet flux of C IV 1550 Å spectral line during different…