A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
Mark J. Pecaut, Eric E. Mamajek, Eric J. Bubar

TL;DR
This study revises the age of Upper Scorpius to approximately 11 million years, analyzes star formation history in the Sco-Cen association, and reevaluates stellar and substellar object properties based on new age estimates.
Contribution
The paper provides a revised age for Upper Scorpius and reassesses star formation timelines and stellar properties using updated isochrones and observational data.
Findings
Upper Scorpius is older (~11 Myr) than previously thought.
Median ages for UCL and LCC are around 16-17 Myr, consistent with prior studies.
The mass of the companion 1RXS J1609-2105b is estimated at ~14 Jupiter masses.
Abstract
We present an analysis of the ages and star-formation history of the F-type stars in the Upper Scorpius (US), Upper Centaurus-Lupus (UCL) and Lower Centaurus-Crux (LCC) subgroups of Scorpius-Centaurus. We find that 1) our empirical isochrones are consistent with the previously published age-rank of the Sco-Cen subgroups, 2) LCC and UCL appear to reach the main sequence turn-on at spectral types ~F4 and ~F2, respectively. An analysis of the A-type stars shows US reaching the main sequence at about spectral type ~A3. 3) The median ages for the pre-main sequence members of UCL and LCC are 16 Myr and 17 Myr, respectively, in agreement with previous studies, however we find that 4) Upper Sco is much older than previously thought. The luminosities of the F-type stars in US are typically a factor of ~2.5 less luminous than predicted for a 5 Myr old population for four sets of evolutionary…
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