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Table 1.

General properties of the young stellar clusters.

Name References Age Massive? Expanding? Distance Σ2 pc Σ20 pc
... ... [Myr] (y/n) (y/n) [pc] [×10−2 arcmin−2] [×10−2 arcmin−2]
NGC 1333 (1)(2)(3)(4)(5)(6) 0−2 n n 291 ± 7 1.6 0.052
IC 348 (1)(2)(3)(4)(5)(6)(7)(8) 0−5 n n 314 ± 8 5.4 0.12
NGC 1893 (6) 1−2 n y 2814 ± 302 80 5.9
λ Ori (1)(2)(4)(5)(6) 1-11 n 393 ± 8 6.2 0.37
NGC 1960 (7) 15−39( † 1) n 1131 ± 37 100 2.4
NGC 2169 (8) 6−12 n 943 ± 43 17 0.67
NGC 2244 (1)(3)(4)(6) 0−4 y y 1414 ± 85 57 6.8
NGC 2264 (1)(2)(4)(6)(7) 0−6 n n 711 ± 32 31 1.0
NGC 2353 (8) 8−16 n 1187 ± 122 80 4.8
NGC 2362 (1)(2)(3)(4)(6)(7)(8) 0−6 y n 1271 ± 88 110 5.8
γ Vel (1)(2)(4)(6) 0−16 n 359 ± 19 9.7 0.80
ASCC 58 (8) 7−13 n 470 ± 15 3.5 0.35
Tr 15 (4) 4−12 y?( † 2) y? 2358 ± 261 440 40
NGC 6231 (6)(8) 1−9 y n 1588 ± 115 230 15
NGC 6531 (8) 5−10 n 1214 ± 68 96 7.4
NGC 6611 (4)(6) 1−4 y y 1602 ± 126 150 16
Tr 37 (1)(2)(3)(4)(6) 0−6 y( † 3) 914 ± 32 31 2.3
NGC 7129 (1)(2)(3)(4)(6) 0−6 n 915 ± 56 12 0.38
NGC 7160 (1)(2)(3)(4)(8) 8−15 n n 920 ± 48 17 1.2

Notes. Column (2) lists disk dissipation studies where the clusters in Col. (1) were included. The numbers in Cols. (3) and (4) are based on such studies and references therein. The age range is indicated in Col. (3). Following Mamajek (2009), an uncertainty of 30% has been assigned to ages without error bars. Column (4) indicates whether the cluster has a total stellar mass above or below 500−1000 M (yes or no), which is in turn indicative of the presence of a significant number of massive OB stars within the clusters (but we note that most are part of OB associations when larger scales are considered; see, e.g., Wright 2020). The presence or absence of evidence indicating cluster expansion (yes or no) is indicated in Col. (5) whenever available in Kuhn et al. (2019). The last three columns are based on our work. The average Gaia EDR3 distance (and standard deviation) to each cluster is shown in Col. (6) (see Appendix C). Columns (7) and (8) show the surface density of member stars for the inner FOV2 pc and the whole FOV20 pc, as inferred from Table A.1.

References. (1)Hernández et al. (2008), (2)Mamajek (2009), (3)Muzerolle et al. (2010), (4)Pfalzner et al. (2014), (5)Ribas et al. (2015), (6)Guarcello et al. (2021), (7)Haisch et al. (2001), (8)Fedele et al. (2010). ( † 1)Panja et al. (2021), ( † 2)Wang et al. (2011), ( † 3)Saurin et al. (2012).

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