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Table 5.
Status on RCB stars candidates listed by Morgan et al. (2003).
| Names | Location | Classification | Comments |
|---|---|---|---|
| RAW 21, EROS2-SMC-RCB-1 | SMC | RCB confirmed | A decline was observed in its EROS-2 light curve and no CH band was observed at 4300 Å (Tisserand et al. 2004). |
| KDM 2373, EROS2-LMC-RCB-2 | LMC | RCB confirmed | A slow decline phase was observed by the MACHO survey as already reported by Morgan et al. (2003). This decline and the following recovery were observed in its EROS2 light curve and no CH band was observed (Tisserand et al. 2009). |
| KDM 5651 | LMC | RCB confirmed | A series of small declines were observed by the three microlensing surveys, MACHO, EROS-2 and OGLE. A decline of ∼0.3 mag at JD∼2450200 was detected by MACHO, then subsequently two similar declines of ∼0.3 mag were also monitored by EROS-2 at JD∼2451800 and ∼2452100. The recovery stage of that last decline was observed by OGLE-III (see Soszyński et al. 2009, OGLE-LMC-RCB-20). About ∼11.8 years later, a stronger decline of ∼1.7 mag was observed by the OGLE-IV RCOM survey(a). We obtained a spectrum during our observational campaign and no CH band was observed, confirming a previous analysis made by Hartwick & Cowley (1988) of their candidate HC 119 spectrum. We observed absorption features due to C2 and CN molecules typical of Cold RCB stars. |
| KDM 2492 | LMC | RCB confirmed | This is the already identified Magellanic RCB star, HV 5637 (Alcock et al. 2001). No decline was observed for more than 20 years between the MACHO, EROS-2 and OGLE-III microlensing surveys, but a ∼2.4 mag decline was monitored by the OGLE-IV RCOM monitoring system. |
| KDM 7101, EROS2-LMC-RCB-5 | LMC | RCB confirmed | Two large and rapid declines were observed by the EROS-2 survey (Tisserand et al. 2009). No CH band was observed. |
| KDM 6546 | Galactic | Confirmed CH star | We obtained a spectrum during our observational campaign and detected a strong CH band-head at ∼4300 Å (see Fig. 9). It was already reported as a CH star by Hartwick & Cowley (1988), HC 193, but as discussed by Morgan et al. (2003), there was a possible issue due to a positional mismatch of more than 30″. |
Notes.
(a)
See OGLE-IV RCOM (OGLE Monitoring system of R Coronae Borealis type variable stars) website: http://ogle.astrouw.edu.pl/ogle4/rcom/kdm-5651a.html
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