A deep NIR survey of very low-mass objects in the R CrA region

Open Access

Table 6

Number of classified YSO and background objects in the reference field.

Group	Dust column density	Area ratio	Median Av	Number of NIR excess objects ^(a)
1	<1.2 × 10²¹/cm²	0.22	2.4	230 (245)
2	1.2−3 × 10²¹/cm²	0.26	4.2	207 (250)
3	3−7 × 10²¹/cm²	0.26	8.9	83 (251)
4	≥ 7 × 10²¹/cm²	0.27	16.5	1 (251)

Notes. ^(a) The numbers of all the identified NIR excess sources and ones brighter than the limiting magnitudes are shown in and outside of parentheses, respectively.

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