R Coronae Borealis stars

Details R Coronae Borealis stars R Coronae Borealis stars

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pobeo..75...45s&link_type=abstract

Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 75, p. 45 - 52 (2003). In: Proceedings of the XII

Physics

Physics Of Stars, Stellar Systems, Variables

Scientific paper

Photometry and low- to high-resolution spectroscopy data have been obtained throughout six declines of different R Coronae Borealis (RCB) stars. Various emission lines which are typical of an RCB decline have been observed. The low-excitation lines, with a blue shift of a few km s-1 have been classified into E2 group. The high-excitation lines of CI, OI and MgI, classified as E1, exhibit a redshift of a few km s-1 relative to the stellar velocity, indicating a possible photospheric origin. The broad lines (BL group) show a constant absolute flux throughout the decline phase and therefore the region of their origin does not seem to be obscured by the dust cloud causing the decline. One can say that the line evolution is consistent with the classification into three groups according to the E1/E2/BL line region model, but they can have different origins from that suggested by the model.

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