Spectra of RY SGR near minimum light

Details Spectra of RY SGR near minimum light Spectra of RY SGR near minimum light

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....80...61s&link_type=abstract

Astronomy and Astrophysics, vol. 80, no. 1, Nov. 1979, p. 61-66.

Astronomy and Astrophysics

Astrophysics

15

B Stars, Optical Emission Spectroscopy, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, D Lines, Emission Spectra, Interstellar Extinction, Stellar Envelopes, Swan Bands

Scientific paper

Spectra of RY Sgr were obtained near minimum light in the blue and green ranges, using the electronic camera. These spectra show a few absorption lines and bands: the (0-0) and (1-1) Swan bands in the green were observed for the first time. The spectra show, moreover, two kinds of emission lines: numerous 'narrow bright lines' and a few 'broad bright lines'. High excitation absorption lines show that at least a part of the photosphere remains with an essentially unchanged temperature. The narrow bright lines, observed in R Cr B and in the 1967 light drop of RY Sgr, were ascribed by Payne-Gaposchkin (1963) to a chromospheric spectrum. The broad bright lines are slightly red-shifted lines of He I and Ca II. An additional yellow-red photographic spectrum shows complex emission D line structures, easily separated into conspicuous narrow bright lines superposed on redshifted broad bright lines. The broad bright lines seem to be linked to the minimum phase but neither to the amplitude nor to the duration of the light drop. In a preceding light drop of RY Sgr in 1967, the broad bright lines are reported to be blue shifted. This behavior could be explained by some asymmetry in the ejection of material.

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