SUMMARY OF SEQUENCE NUMBER 200035

SUMMARY OF SEQUENCE NUMBER 200035

Title: MEASURING DOPPLER SHIFTS OF X-RAY LINES TO DETERMINE THE STELLAR WIND X-RAY LOCATIONS IN OB STARS

Observer: WALDRON

Subject Category: Normal Stars and WD

Seq: 200035 ObsId: 01524

Long-term Plan bin: no LTS bin

ABSTRACT

For almost 20 years we have been trying to determine the source of the X-ray emission in OB stars. It is generally believed that this emission is caused by a distribution of stellar wind shocks. The AXAF grating spectrometers will provide the ultimate test of X-ray models. The shock model predicts that X-ray lines must be Doppler blue-shifted, hence, our primary objective is to measure these blue-shifts. MARX simulations show that the expected X-ray line shifts will be at least 4 times the MEG1 energy resolution limit. ASCA observations have provided stronger constraints on X-ray models, but they have also raised additional questions (e.g., X-ray abundance anomalies). The large number of X-ray lines predicted by MARX simulations will allow us to probe X-ray densities and abundances.

TARGET SUMMARY

TARGET NAME RADEC TIME SI GRAT TYPE TC ROLL PRE PHASE MULTI PRI
ZETA ORI
85.189583
-1.942778
15.00000
ACIS-S
HETG
GO
no
yes
no
no
no
5

IMAGES

(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)

Roll/Visibility

PARAMETERS

Obscat Parameters