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Table 1

Properties of the stellar populations in the Sco-Cen complex.

Population Age (a)
(Myr)
Npop Ntot NSN Mmax
(M)
k
US 11 1147 401 0 5.7 221.1
Ophiuchus (b) 2–6(c) 160 67 0 1.9 43.0
Lupus 6 95 51 0 12.1 27.4
V1062 Sco 20 390 113 1 5.5 62.4
UCL/LCC 20 5273 1614 13 8.4 874.6

Notes. The table lists the population ages; the numbers of stars that satisfy the spatial, kinematic, and photometric criteria for membership in the populations as imposed by Luhman (2022; Npop); the number of members with spectral types of M6 or earlier and initial masses above 0.5 M after accounting for incompleteness (Ntot); the expected number of SNe (NSN); the current highest stellar initial mass in the samples (Mmax); and the IMF normalisation constant (k). (a) As inferred by Esplin & Luhman (2020), Luhman & Esplin (2020), and Luhman (2020) from comparing the Hertzsprung-Russell diagrams (HRDs) of low-mass stars in Sco-Cen and other nearby associations using Gaia DR2. (b) According to Luhman (2022), the Ophiuchus sample is likely to be biased in favour of earlier spectral types, since those candidates feature the largest range of extinctions among the Sco-Cen populations and brighter, more massive stars can be detected at higher extinctions. To reduce such biases, we followed Luhman and considered only candidates with extinctions less than 0.5 mag in the 2MASS Ks band. (c) For the calculations in this work, we used an average age of 4 Myr.

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