EROS2 : R Coronae Borealis

EROS2-SMC : R Coronae Borealis

Article : "EROS-2 photometry of probable R Coronae Borealis Stars in the Small Magellanic Cloud" (Article: Astro-ph, ADS)

Abstract :

EROS2 (Expérience de Recherche d'Objets Sombres) conducted a survey of the SMC between July 1996 and February 2003 in two non-standard broad photometric passbands. The photometric data of 4.2 million stars have been searched for behavior 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 RAW21, RAW233, RAW476, and [MH95]431 with confirmed carbon-rich atmosphere, characteristics of RCB. From the EROS2 light curve of RAW21 and its spectrum reported by Morgan et al. (2003), we confirm it is the first RCB in the SMC. The other objects are new RCB candidates with absolute luminosity and colour close to those found for RCB in the LMC. We propose that 2 of them are DY Per-like RCB.

General RCBs description :

Approximate position of the 5 EROS2 RCB stars with the 10 SMC fields observed during 7 years.

RCB identifiers & J H K magnitudes

RCB stars :

We present, for each RCB candidate, the EROS2 ligthcurves (V_E, R_E and Color V_E-R_E) during the seven observing years and the finding charts. It is possible to download the image in gif or fits format and an ASCII file to obtain these raw data, organised as followed:
_The vertical lines on the ligthcurves graphics indicates the epoch of the 2MASS observation (solid lines) and the DENIS ones (dashed lines).
_Finding chart = (North-East : Top-Left) of 400*400 pixels with a pixel size of 0.42", the two white lines are 8.4" long.

RAW 21: (ra = 00:37:47.07 ; dec = -73:39:02.1)_J2000

=> ASCII data file

!! New !! : RCB RAW21 Movie