SIMBAD references

2008MNRAS.384..477R - Mon. Not. R. Astron. Soc., 384, 477-488 (2008/February-3)

High-resolution spectroscopy of the R Coronae Borealis star V Coronae Australis.


Abstract (from CDS):

Optical high-resolution spectra of the R Coronae Borealis star V CrA at light maximum and during minimum light are discussed. Abundance analysis confirms previous results showing that V CrA has the composition of the small subclass of R Coronae Borealis (RCB) stars know as `minority' RCBs, i.e. the Si/Fe and S/Fe ratios are 100 times their solar values. A notable novel result for RCBs is the detection of the 1-0 Swan system 12C13C bandhead indicating that 13C is abundant: spectrum synthesis shows that 12C/13C is about 3-4. Absorption-line profiles are variable at maximum light with some lines showing evidence of splitting by about 10 km/s. A spectrum obtained as the star was recovering from a deep minimum shows the presence of cool C2 molecules with a rotational temperature of about 1200K, a temperature suggestive of gas in which carbon is condensing into soot. The presence of rapidly outflowing gas is shown by blueshifted absorption components of the Nai D and Ki 7698 Å resonance lines.

Abstract Copyright: © 2008 The Authors

Journal keyword(s): circumstellar matter - stars: individual: R CrB - stars: variables: other

CDS comments: In Fig. 13 : IRAS 2243+43 is not identified.

Simbad objects: 12

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