The ongoing pursuit of R Coronae Borealis stars: ASAS-3 survey strikes again
P. Tisserand, G. C. Clayton, D. L. Welch, B. Pilecki, L. Wyrzykowski, and D. Kilkenny

TL;DR
This study uses the ASAS-3 survey to discover 21 new R Coronae Borealis stars, enhancing understanding of their distribution, properties, and formation, and confirming their association with the Galactic bulge.
Contribution
The paper presents a new, efficient method combining infrared excess and light curve analysis to identify RCB stars, discovering 21 new RCBs and confirming their bulge population.
Findings
21 new RCB stars discovered
Detection efficiency of ~90% for bright RCBs
RCBs are part of the Galactic bulge population
Abstract
R Coronae Borealis stars (RCBs) are rare, hydrogen-deficient, carbon-rich supergiant variable stars that are likely the evolved merger products of pairs of CO and He white dwarfs. Only 55 RCB stars are known in our galaxy and their distribution on the sky is weighted heavily by microlensing survey field positions. A less-biased wide-area survey would provide the ability to test competing evolutionary scenarios, understand the population or populations that produce RCBs and constraint their formation rate. The ASAS-3 survey monitored the sky south of declination +28 deg since 2000 to a limiting magnitude of V=14. We searched ASAS-3 for RCB variables using a number of different methods to ensure that the probability of RCB detection was as high as possible and to reduce selection biases based on luminosity, temperature, dust production activity and shell brightness. Candidates whose light…
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