Possible Indicator of Incipient Light Minimum in a Star with the R Coronae Borealis Type Variability

Details Possible Indicator of Incipient Light Minimum in a Star with the R Coronae Borealis Type Variability Possible Indicator of Incipient Light Minimum in a Star with the R Coronae Borealis Type Variability

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391...45r&link_type=abstract

Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard

Astronomy and Astrophysics

Astronomy

Scientific paper

The appearance of the 25 km s-1 blue-shifted component in the Na I D lines may be interpreted as an indicator of the beginning of a visual light minimum in stars with the R Coronae Borealis type variability. Since 1994, this component was a forerunner of the visual light minimum in R CrB itself at least three times. In the 1995, 1998, and probably in the 2003 minimum, it was found for a day or several days before the beginning of light decline. A similar relation was also found for the infrared triplet line Ca II λ854.2 nm.

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