Suspected cool R Coronae Borealis stars in the Magellanic Clouds期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Suspected cool R Coronae Borealis stars in the Magellanic Clouds

Authors:	D H Morgan D Hatzidimitriou R D Cannon B F W Croke

Institution:	Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ;Department of Physics, University of Crete, Heraklion, Greece;Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia;Integrated Catchment Assessment and Management Centre, Centre for Resource and Environment Studies, Australian National University, Canberra, ACT 0200, Australia

Abstract:	Six stars out of a sample of ～2300 carbon stars in the Magellanic Clouds have been identified as having strong C₂ bands but CN bands that are very weak or absent. It is argued that five of these are likely to be R Coronae Borealis (RCB) stars on the basis of their spectral characteristics and peculiar colours. Most are variables and the Large Magellanic Cloud (LMC) members have extreme radial velocities that are more like the planetary nebula population than the carbon stars. This sample consists of four LMC members (only one of them previously recognized as an RCB star), one Small Magellanic Cloud (SMC) member (the first RCB star reported in the SMC) and one foreground Galactic star.

Keywords:	stars: carbon Magellanic Clouds