Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.9307w&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #93.07; Bulletin of the American Astronomical Society, Vol. 29, p.1363
Astronomy and Astrophysics
Astronomy
Scientific paper
The observed X-ray and highly variable nonthermal radio emission from OB stars has eluded explanation for more than 15 years. The most favorable model of X-ray production in these stars (stellar wind shocks) predicts that both nonthermal radio emission and nonthermal X-ray emission above 2 keV should be present. The model suggests that the variability of this nonthermal X-ray component should be comparable to the radio variability for the case of a propagating wind disturbance. In addition, since the spatial separation between the X-ray and radio emission locations can range from ten to several hundred stellar radii, a time lag is expected in the variability of the two emission processes. To understand the causality between the X-ray and radio emission, we obtained ASCA and multi-wavelength (2, 3.6, 6 and 20 cm) VLA observations over a 3 week time span in 1997 from late September to mid October of a well known nonthermal radio and strong X-ray source, 9 Sgr, an O4V((f)) star. We present our preliminary analysis of the X-ray and radio data and discuss the implications of our results relevant to the proposed models.
Corcoran Michael F.
Drake Stephen Alan
Kitamoto Shunji
Waldron Wayne L.
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