Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stin...0247005r&link_type=abstract
Conference Paper, New Visions of the X-Ray Universe in the XMM-Newton and Chandra Era Inst. d'Astrophysique
Astronomy and Astrophysics
Astrophysics
Nebulae, X Ray Sources, Relativistic Particles, High Energy Electrons, Main Sequence Stars, Xmm-Newton Telescope, Point Sources, B Stars, O Stars, Data Reduction, Stellar Mass
Scientific paper
We report preliminary results of an XMM-Newton observation of the 04 V star 9 Sgr (= HD 164794). 9 Sgr is one of a few single OB stars that display a non-thermal radio emission attributed to synchrotron emission by relativistic electrons. Inverse Compton scattering of photospheric UV photons by these relativistic electrons is a priori expected to generate a non-thermal power-law tail in the X-ray spectrum. Our EPIC and RGS spectra of 9 Sgr suggest a more complex situation than expected from this 'simple' theoretical picture. Furthermore, soft-band EPIC images of the region around 9 Sgr reveal a number of point sources inside the Lagoon Nebula (M8). Most of these sources have optical counterparts inside the very young open cluster NGC 6530 and several X-ray sources are associated with low and intermediate mass pre-main sequence stars. Finally, we also detect (probably) diffuse X-ray emission from the Hourglass Region that might reveal a hot bubble blown by the stellar wind of Herschel 36, the ionizing star of the HG region.
Blomme Ronny
Chapman Jessica M.
Corcoran Michael F.
Detal A.
Gosset Eric
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