TY - JOUR
T1 - New members of the Scorpius-Centaurus complex and ages of its sub-regions
AU - Song, Inseok
AU - Zuckerman, B.
AU - Bessell, M. S.
PY - 2012/7
Y1 - 2012/7
N2 - We have spectroscopically identified ∼100 G-, K-, and M-type members of the Scorpius-Centaurus complex. To deduce the age of these young stars we compare their Liλ6708 absorption line strengths against those of stars in the TW Hydrae association and β Pictoris moving group. These line strengths indicate that Sco-Cen stars are younger than β Pic stars whose ages of ∼12Myr have previously been derived from a kinematic traceback analysis. Our derived age, ∼10Myr, for stars in the Lower Centaurus Crux and Upper Centaurus Lupus subgroups of ScoCen is younger than previously published ages based on the moving cluster method and upper main-sequence fitting. The discrepant ages are likely due to an incorrect (or lack of) cross-calibration between model-dependent and model-independent age-dating methods.
AB - We have spectroscopically identified ∼100 G-, K-, and M-type members of the Scorpius-Centaurus complex. To deduce the age of these young stars we compare their Liλ6708 absorption line strengths against those of stars in the TW Hydrae association and β Pictoris moving group. These line strengths indicate that Sco-Cen stars are younger than β Pic stars whose ages of ∼12Myr have previously been derived from a kinematic traceback analysis. Our derived age, ∼10Myr, for stars in the Lower Centaurus Crux and Upper Centaurus Lupus subgroups of ScoCen is younger than previously published ages based on the moving cluster method and upper main-sequence fitting. The discrepant ages are likely due to an incorrect (or lack of) cross-calibration between model-dependent and model-independent age-dating methods.
KW - open clusters and associations: individual (Scorpius OB2, Lower Centaurus-Crux, Upper Centaurus-Lupus, Upper Scorpius)
KW - stars: activity
KW - stars: kinematics and dynamics
KW - stars: pre-main sequence
UR - http://www.scopus.com/inward/record.url?scp=84862553580&partnerID=8YFLogxK
U2 - 10.1088/0004-6256/144/1/8
DO - 10.1088/0004-6256/144/1/8
M3 - Article
SN - 0004-6256
VL - 144
JO - Astronomical Journal
JF - Astronomical Journal
IS - 1
M1 - 8
ER -