= > in this proposal, more time is being requested for rwaters.obdwarf = we propose to obtain high s/n spectra of selected hydrogen lines in hot ob dwarfs in order to probe the outer regions of their atmosphere and the region in which the onset of the radiation driven wind occurs. these outer regions are very difficult to study with other observing techniques because lines are often saturated and are formed over a very wide range of depths. we have already obtained iso spectra of some stars, and detected emission in several, demonstrating the success of the approach. here we ask for more observing time in order to complete the programme, which was severely compromised by the reduced in-orbit sensitivities of iso, resulting in a present sample which is statistically not significant. with these data we will determine the mass loss rate and its dependence on stellar rotation rate.
Instrument
SWS02
Temporal Coverage
1997-04-28T05:54:06Z/1998-03-06T10:00:06Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1999, Ir Spectroscopy Of Ob Dwarfs Probing The Outer Layers Of The Atmosphere, 1.0, European Space Agency, https://doi.org/10.5270/esa-d1zbor5
