New R Coronae Borealis and DY Persei Star Candidates and Other Related Objects Found in Photometric Surveys

TL;DR

This study identifies new R Coronae Borealis and DY Persei star candidates using photometric survey data, expanding the catalog of these rare variable stars and providing a basis for future spectroscopic follow-up.

Contribution

The paper reports the discovery of new RCB and DY Persei candidates through analysis of multiple photometric surveys, incorporating color and variability criteria, and offers a catalog for further study.

Findings

Identified 2 new RCB stars

Found 4 RCB candidates and 1 DY Persei candidate

Presented a sample of interesting but unclassified variable stars

Abstract

We have carried out a search for new R Coronae Borealis (RCB) variables using the publicly accessible data from various photometric sky surveys and-whenever available-AAVSO visual data. Candidates were selected from Tisserand`s "Catalogue enriched with R CrB stars" and by a visual inspection of light curves from the ASAS-3, MACHO, NSVS and OGLE surveys. We have identified two new RCB stars, four RCB candidates, and one DY Persei (DYPer) star candidate. Our identification was based mainly on photometric variability, color-color diagrams, and further information drawn from various catalogue sources; spectroscopic classifications were also reported in our analysis whenever available. Additionally, we present a sample of interesting stars which-although showing similar photometric variability-can be ruled out as RCB and DYPer stars or have been rejected as such on spectroscopic grounds in recent studies. Although not useful in the investigation of the aforementioned groups of variables, these objects defy an easy classification and might be interesting targets for follow-up studies which we encourage for all stars presented in this paper.