The remarkable spectrum of the RV Tauri star R Scuti at deep minimum

Details The remarkable spectrum of the RV Tauri star R Scuti at deep minimum The remarkable spectrum of the RV Tauri star R Scuti at deep minimum

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..762h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Oct. 1983, p. 762-767.

Other

12

R Coronae Borealis Stars, Radiant Flux Density, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Chromosphere, Emission Spectra, H Alpha Line, Light Curve, Minima, Radial Velocity, Spectral Line Width

Scientific paper

In September 1981 R Sct H-alpha declined in brightness to V about 8.5, an exceptionally faint minimum. A 15 A/mm spectrogram of the H-alpha region of R Sct two days past minimum brightness, when the visual magnitude was about 8.3, was obtained. This is apparently the first spectral observation of R Sct close to such a deep minimum. Contrary to spectroscopic observations during 'ordinary' minima of V about 6-7, at this deep minimum the expected G-K Ia absorption spectrum is not seen. Instead, a fantastic array of dozens of strong, narrow emission features and strong TiO absorption bands are present. The emission lines are due to neutral metals, and closely resemble a reversed photospheric spectrum. The deep minimum spectrum is apparently purely chromospheric, and is not produced in a stellar wind or extended atmosphere. The spectroscopic behavior of R Sct at deep minimum, as well as a number of other kinematic and photometric properties, is surprisingly similar to that of the R Coronae Borealis variables.

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