The optical spectrum of the flaring maser star U Orionis at several maxima between 1973 and 1983

Details The optical spectrum of the flaring maser star U Orionis at several maxima between 1973 and 1983 The optical spectrum of the flaring maser star U Orionis at several maxima between 1973 and 1983

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1001w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Oct. 1985, p. 1001-1004. NSF-supported research.

Astronomy and Astrophysics

Astronomy

7

Flare Stars, Radial Velocity, Variable Stars, Visible Spectrum, Emission Spectra, Maxima, Shock Waves

Scientific paper

The author presents radial-velocity data during four maxima of U Ori between 1973 and 1983, including the unprecedented bright maximum of 1973 and the rather faint maxima of 1977 and 1983. During the bright maximum of 1973 the emission lines were surprisingly strong. The circumstellar expansion velocity seems to have increased between 1977 and 1981. The source of the 1973 emission spectrum is discussed with the conclusion that it probably comes from a region of larger volume than usual, excited by radiation from a shock below it.

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