Spectroscopy and Multi-color Photometry of U Scorpii at the Earliest Stage of 2010 Outburst

Details Spectroscopy and Multi-color Photometry of U Scorpii at the Earliest Stage of 2010 Outburst Spectroscopy and Multi-color Photometry of U Scorpii at the Earliest Stage of 2010 Outburst

2012-01-07

arxiv.org/abs/1201.1544v1

The Bulletin of Okayama University of Science (No. 47 A pp. 7-9) 2011

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

3 pages, 2 figures, accepted for publication in The Bulletin of Okayama University of Science

Scientific paper

We have performed our spectroscopic and multi-color photometric observations of the recurrent nova U Scorpii at the earliest stage of the 2010 outburst. 0.37 days after the discovery of the outburst, we can see broad and prominent emission lines of Balmer series, He I, N II, N III, O I and Mg II on the spectra. The FWHM of H$\alpha$ line yields an expansion velocity of approximately 6200 km/s. This line also accompanies a blue shifted absorption line (so called P Cygni profile). 1.37 days after the discovery, H$\alpha$ line shows a nearly flat-topped profile in contrast to the previous day. From our multi-color photometry, we can see its rapid decline (one magnitude per day) of the brightness in each color band.

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