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

Scritto il 04 Lug 2012 alle 01:39 in Pubblicazioni

We present optical and NIR spectroscopic observations of U Sco 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 U Sco SSS phase is fueled (in part or fully) by
accretion and should not be used to estimate $m_{\mathrm{rem}}$, the
mass of accreted material which has not been ejected during the
outburst. In addition, most of the He emission…

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