===================================================================== ==> in this proposal, more time is being requested for jcassine.wr_veloc ==> this proposal requests an upgrade from priority 3 for jcassine.wr_veloc ===================================================================== a method for deriving the wind velocity law from multiline ir spectral observations is described. the technique utilizes the fact that for dense stellar winds, the continuum will be formed in the wind itself, and the radial distance of the free-free continuum formation becomes larger with increasing wavelength. the observed line emission from the wind occurs mostly exterior to the continuum, hence as the continuum marches through the wind as a function of wavelength, the different lines will probe different regions of the wind acceleration. thus, the line width is expected to grow with wavelength, a result that can be used to derive the velocity law of the wind. we propose to apply this theory to derive the velocity distribution in wolf-rayet (wr) winds. preliminary iso spectral observations of the wr star, wr134 are presented and used as a guide for the observations proposed here. in particular, we desire ir spectral line observations of at least one more nitrogen-rich wr star and a carbon-rich wr star to determine if the wind velocity distribution varies with stellar evolution. thus, we request that (1) wr136 and wr1 of the original proposal be ^ated above priority 3, but using our new list, (2) wr111, a carbon-rich star, be added as a target, and (3) lines not among our original list but present in our new list be observed in wr134, that was successfully observed in our original proposal.
Instrument
SWS01 , SWS06
Temporal Coverage
1997-03-21T16:21:20Z/1997-04-29T08:20:08Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds 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, CASSINELLI et al., 1998, 'THE VELOCITY STRUCTURE OF WOLF-RAYET WINDS FROM INFRARED LINE AND CONTINUUM OBSERVATIONS', 1.0, European Space Agency, https://doi.org/10.5270/esa-rqhbo1d
