U Scorpii 2010 outburst: a new understanding of the binary accretion disk and the secondary star

Scritto il 28 Ago 2012 alle 01:39 in Pubblicazioni

We present optical and near-infrared (NIR) spectroscopic observations of <ASTROBJ>U Sco</ASTROBJ> 2010 outburst. From the analysis of lines profiles we identify a broad and a narrow component and show that the latter originates from the reforming accretion disk. We show that the accretion resumes shortly after the outburst, on day +8, roughly when the super-soft (SSS) X-ray phase starts. Consequently <ASTROBJ>U Sco</ASTROBJ> SSS phase is fueled (in part or fully) by accretion and should not be used to estimate m<SUB>rem</SUB>, the mass of accreted material which has not been ejected...

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