dc.contributor.author |
Kameswara Rao, N |
en |
dc.contributor.author |
Lambert, D. L |
en |
dc.date.accessioned |
2008-02-29T05:40:49Z |
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dc.date.available |
2008-02-29T05:40:49Z |
|
dc.date.issued |
2008-02 |
|
dc.identifier.citation |
MNRAS, Vol. 384, No. 2, pp. 477 – 488 |
en |
dc.identifier.uri |
http://hdl.handle.net/2248/2092 |
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dc.description |
Restricted Access |
en |
dc.description.abstract |
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−1. 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 1200 K, 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 Na i D and K i 7698 Å resonance lines. |
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dc.format.extent |
900974 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
Blackwell Synergy |
en |
dc.relation.uri |
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-2966.2007.12643.x |
en |
dc.subject |
High-resolution spectroscopy |
en |
dc.subject |
R Coronae Borealis star V Coronae |
en |
dc.title |
High-resolution spectroscopy of the R Coronae Borealis star V Coronae Australis |
en |
dc.type |
Article |
en |