Abundance Analyses of the New R Coronae Borealis Stars ASAS-RCB-8 and ASAS-RCB-10

Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majo...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 2017-10, Vol.129 (980), p.1-8
Main Authors: Hema, B. P., Pandey, Gajendra, Kamath, Devika, Rao, N. Kameswara, Lambert, David, Woolf, Vincent M.
Format: Article
Language:English
Subjects:
Contamination
Stars
Stars and Stellar Evolution
Online Access:Get full text
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Summary:Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majority RCBs with an above average O abundance. Relative to ASAS-RCB-10, ASAS-RCB-8 is H poor by 1.6 dex, O-poor by 0.7 dex but N-rich by 0.8 dex suggesting a higher contamination by CNO-cycled material.
ISSN:0004-6280
1538-3873