Chandra HETG Spectra of SS Cyg and U Gem in Quiescence and Outburst

Details Chandra HETG Spectra of SS Cyg and U Gem in Quiescence and Outburst Chandra HETG Spectra of SS Cyg and U Gem in Quiescence and Outburst

2004-09-27

arxiv.org/abs/astro-ph/0409660v1

Astronomy and Astrophysics

Astrophysics

2 pages including 1 encapsulated postscript figure; LaTeX format, uses asp2004.sty; to appear in the proceedings of The Astrop

Scientific paper

Chandra HETG spectra of the prototypical dwarf novae SS Cyg and U Gem in quiescence and outburst are presented and discussed. When SS Cyg goes into outburst, it becomes dimmer in hard X-rays and displays a dramatic shift in its relative line strengths, whereas when U Gem goes into outburst, it becomes brighter in hard X-rays and displays only a minor shift in its relative line strengths. In both systems, the emission lines become significantly broader in outburst, signaling the presence of high velocity gas either in Keplerian orbits around the white dwarf or flowing outward from the system.

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