Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009arep...53..203t&link_type=abstract
Astronomy Reports, Volume 53, Issue 3, pp.203-213
Astronomy and Astrophysics
Astronomy
97.80.Gm, 95.85.Kr
Scientific paper
We analyze low-dispersion (1.8 Å per pixel) spectra of the recurrent nova RS Oph taken between the 10th and 241st days after its outburst on February 12, 2006. The spectra exhibit various stages in the development of the outburst, from its coronal phase to its nebular phase. We identified about 200 spectral lines at 3700-7500 Å, and fluxes were determined for the strongest lines. The spectral behavior of this outburst does not differ strongly from the previous one. One of the main differences is the presence of flux variations in the forbidden [NII] 5775 Å, [OI] 6300 Å, [OIII] 4959 Å, [OIII] 5007 Å, [KIV] 6101 Å, [FeVII] 6086 Å, and [FeX] 6375 Å lines, as well as in the HeI 5876 Å, HeI 6678 Å, HeII 4686 Å lines. We also obtained high-dispersion (0.06 Å per pixel) spectra in the region of the Hα and HeI 5876 Å lines between the 9th and 113th days after the outburst. The HeI 5876 Å profile has three components. This shape of the profile may result from the formation of an envelope after the aspherical explosion.
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