Abundance Analyses of Field RV Stars, V: DS Aquarii, UY Arae, TW Camelopardis, BT Librae, U Moncerotis, TT Ophiuchi, and RV Tauri

Abstract

Abundance analyses are presented and discussed for eight RV Tauri variables. The RV B star UY Ara shows the abundance anomalies seen in other RV B stars, namely elements that condense into grains at high temperature are underabundant but elements of low condensation temperature are much less underabundant. This pattern is ascribed to a separation of dust from gas with accretion of gas but not dust by the atmosphere. Abundances for two RV C stars with earlier results for other RV C stars show that these intrinsically metal-poor stars do not show effects of dust-gas separation. Analyses of five RV A stars show that these cooler stars are very largely unaffected by dust-gas separation. It is proposed that the deeper convective envelope of cooler stars dilutes anomalies resulting from dust-gas separation - the dusty wind off the RV Tauri variable or a dusty circumbinary disk - are reviewed and observational tests are suggested.

42 pages, 6 figures, 8 tables, this may be listed as ApJ in press

References in corpus (1)

• The Chemical Compositions of the SRd Variable Stars-- II. WY Andromedae, VW Eridani, and UW Librae

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