EROS 2 photometry of probable R Coronae Borealis stars in the Small Magellanic Cloud

Abstract

EROS 2 (Experience de Recherche d'Objets Sombres) conducted a survey of the SMC between July 1996 and February 2003 in two EROS broad-band colours, V_E and R_E. The photometric data of 4.2 million stars have been searched for behaviour typical of R Coronae Borealis (RCB) candidates such as drastic changes in magnitude. Five objects have been found, four of them being catalogued in the Simbad database as RAW 21, RAW 233, RAW 476, and [MH95] 431 with confirmed carbon-rich atmospheres, characteristic of RCB. From the EROS 2 light curve of RAW 21 and its spectrum reported by Morgan et al. (2003), we confirm that it is the first RCB to be found in the SMC. The other objects are new RCB candidates with absolute luminosity and colour close to those found for RCBs in the LMC. We propose that 2 of them are DY Per-like RCBs.

8 pages, 9 figures, accepted for publication in A&A. Uses aa.cls and natbib.sty files

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Cited by in corpus (21)

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• Spitzer Infrared Spectrographic point source classification in the Small Magellanic Cloud
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• The ongoing pursuit of R Coronae Borealis stars: ASAS-3 survey strikes again
• An Extremely Large Excess of 18O in the Hydrogen-Deficient Carbon Star, HD 137613
• R CrB Candidates in the Small Magellanic Cloud: Observations of Cold, Featureless Dust with the Spitzer Infrared Spectrograph
• Tracking down R Coronae Borealis stars from their mid-infrared WISE colours
• R Coronae Borealis stars in the Galactic Bulge discovered by EROS-2
• A plethora of new R Coronae Borealis stars discovered from a dedicated spectroscopic follow-up survey
• Discovery of Five New R Coronae Borealis Stars in the MACHO Galactic Bulge Database
• Extreme Infrared Variables from UKIDSS - I. A Concentration in Star Forming Regions
• The dawn of a new era for dustless HdC stars with GAIA eDR3
• Discovery of Bright Galactic R Coronae Borealis and DY Persei Variables: Rare Gems Mined from ACVS
• Census of R Coronae Borealis stars I: Infrared light curves from Palomar Gattini IR
• New R Coronae Borealis stars discovered in OGLE-III Galactic Bulge fields from their mid- and near- infrared properties
• First detection of dust clouds around R CrB variable stars
• A Spectral Classification System for Hydrogen-deficient Carbon Stars
• Are DY\,Persei stars cooler cousins of R Coronae Borealis stars?
• Detection of Near-IR CO Absorption Bands in R Coronae Borealis Stars
• HE 1015-2050: Discovery of a Hydrogen-deficient carbon star at high galactic latitude
• New R Coronae Borealis and DY Persei Candidates in the SMC