The FeII λ5317 line profile of nine Be stars

Searching for Line Profile Variability in HgMn Stars

Abstract. Spectra of four non-magnetic chemically peculiar late B type stars (HgMn) stars are analysed to detect periodic spectral line variations (LPVs). A procedure developed to study LPVs in Slowly Pulsating B stars has been adopted as pulsational properties of HgMn stars should be expected to be similar. In the preliminary results discussed here no conclusive evidence for periodic LPVs was ...

Spectropolarimetric Observations of Herbig Ae/be Stars. Ii. Comparison of Spectropolarimetric Surveys: Haebe, Be and Other Emission-line Stars

The polarization of light across individual spectral lines contains information about the circumstellar environment on very small spatial scales. We have obtained a large number of high precision, high resolution spectropolarimetric observations of Herbig Ae/Be, Classical Be and other emission-line stars collected on 117 nights of observations with the HiVIS spectropolarimeter at a resolution o...

IDEA Version Nine Product Profile

Multi-line analysis of the spectra of Herbig Ae/Be stars

We present the results of the study of four Herbig Ae/Be stars (AB Aur, BD+46◦3471, HD250550, BD+61◦154). For each of them, semi-empirical models of the structure of their winds have been constructed; we then calculated the Hα line, the Balmer discontinuity, as well as the C IV 1548 Å and Mg II h or k resonance lines. Thanks to comparison with observational data, we have deduced constraints on ...

X-Ray Spectroscopy Of The Radiation-Driven Winds Of Massive Stars: Line Profile And Line Ratio Diagnostics

Massive stars drive powerful, supersonic winds via the radiative momentum associated with the thermal UV emission from their photospheres. Shock phenomena are ubiquitous in these winds, heating them to millions, and sometimes tens of millions, of degrees. The emission line spectra from the shock-heated plasma provide powerful diagnostics of the winds’ physical conditions, which in turn provide ...