Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..281s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 15, 1988, p. 281-289.
Astronomy and Astrophysics
Astrophysics
35
Emission Spectra, Infrared Photometry, Novae, Nuclear Astrophysics, Stellar Spectra, Bursts, Light Curve, Line Spectra, White Dwarf Stars
Scientific paper
Optical and infrared observations of U Sco during its 1987 outburst are presented. The interval since the last outburst (8 yr) is exceptionally short and places constraints on the thermonuclear runaway model. Spectra early in the decline show broad (FWZI = 10,000 km/s) near-flat topped lines. On the model of Webbink et al. (1987) this would be interpreted as ejection of an optically thin shell. On this model the later data suggest the presence of a brightened disk in the system. The possibility that the disk seen in quiescence is heated by the ejecta is discussed. Similarities between U Sco and the nitrogen flaring stage in classical novae are mentioned. The emission line ratio N III 4634/4640 + 4641 A is unusually large during the early development of the U Sco outburst.
Feast Michael W.
Jones Jonathan Spencer
Overbeek Daniel M.
Sekiguchi Kaz
Wargau Walter W.
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