Fig. 1

Color−color diagram of variable sources in RCW 38. Black dots with error bars denote averaged photometric single observations from Dörr et al (2013). The main sequence is shown in blue and the locus of unreddened classical T Tauri stars (CTTS) by the red long-dashed line. Two sources with ID 557 and 559 are highlighted in red; the small circles mark the individual H and K measurements placed at mean J − H owing to the lack of J variability data; the large circles give the mean H − K. The AV vectors are based on Rieke & Lebofsky (1985).
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