Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-08-17
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
5 pages, 3 figures, Accepted for publication of PASJ Letters
Scientific paper
We present early spectroscopy of the recurrent nova U~Sco during the outburst in 2010. We successfully obtained time-series spectra at $t_{\rm d}=$0.37--0.44~d, where $t_{\rm d}$ denotes the time from the discovery of the present outburst. This is the first time-resolved spectroscopy on the first night of U Sco outbursts. At $t_{\rm d}\sim 0.4$~d the H$\alpha$ line consists of a blue-shifted ($-5000$ km s$^{-1}$) narrow absorption component and a wide emission component having triple peaks, a blue ($\sim -3000$ km s$^{-1}$), a central ($\sim 0$ km s$^{-1}$) and a red ($\sim +3000$ km s$^{-1}$) ones. The blue and red peaks developed more rapidly than the central one during the first night. This rapid variation would be caused by the growth of aspherical wind produced during the earliest stage of the outburst. At $t_{\rm d}=1.4$~d the H$\alpha$ line has a nearly flat-topped profile with weak blue and red peaks at $\sim \pm 3000$ km s$^{-1}$. This profile can be attributed to a nearly spherical shell, while the asphericity growing on the first night still remains. The wind asphericity is less significant after $t_{\rm d}=9$ d.
Arai Akira
Fujii Mitsugu
Harao Tatsuya
Imamura Kazuyoshi
Itoh Ryosuke
No associations
LandOfFree
Early Spectroscopy of the 2010 Outburst of U Scorpii does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Early Spectroscopy of the 2010 Outburst of U Scorpii, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Early Spectroscopy of the 2010 Outburst of U Scorpii will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-397514