A spectrum of RY SGR during recovery from its 1993 minimum

Details A spectrum of RY SGR during recovery from its 1993 minimum A spectrum of RY SGR during recovery from its 1993 minimum

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107..244v&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 107, no. 709, p. 244-249

Astronomy and Astrophysics

Astronomy

9

Absorption Spectra, Emission Spectra, Infrared Spectra, R Coronae Borealis Stars, Red Shift, Stellar Envelopes, Stellar Winds, Escape Velocity, Gas Flow, Radial Velocity, Spectrum Analysis

Scientific paper

A spectrum of the R Coronae Borealis (RCB) star RY Sgr in the red and near IR was obtained during its recovery from a deep minimum. The spectrum shows numerous weak emission lines blueshifted by 20 km/s relative to the photosphere of the star. In addition to the emission-line spectrum, strong, blueshifted Na I D lines are seen in absorption at a velocity of -200 km/s. An analysis of these lines shows that the column density of Na I in this fast-moving cloud is 2.5 x 1013/sq cm and that the Na I/K I ratio is substantially enhanced above the solar ratio. The inverse P Cygni profiles of the weak sharp lines are consistent with a picture in which outward moving gas may be interacting with a layer above it to create a weak shock capable of ionizing metals but not C I.

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