A Census of the Low Accretors. I: The Catalog
Thanawuth Thanathibodee, Nuria Calvet, Jesus Hernandez, Karina Mauco,, Cesar Briceno

TL;DR
This study catalogs low-accretion, disk-bearing young stars, revealing that a significant fraction still accrete at very low rates, especially in younger populations, challenging previous classifications based solely on traditional accretion indicators.
Contribution
It provides the first comprehensive catalog of low-accretion, disk-bearing stars using He I λ10830 profiles, identifying that 20-30% are still accreting despite previous non-accretion classification.
Findings
20-30% of previously classified non-accretors are still accreting.
Accretion detection correlates with younger stellar populations.
Hα width at 10% can misclassify low-level accretors.
Abstract
Observations have shown that the disk frequency and the fraction of accreting pre-main-sequence stars decrease with the age of the population and that some stars appear to have disks while their accretion has stopped. Still, it is unclear how disk-bearing stars stop their accretion. To provide insight into the last stages of accretion in low-mass young stars, we conducted a survey of disk-bearing stars that are thought to be non-accretors to identify stars still accreting at very low rates. Here we present the first catalog of the survey of 170 disk-bearing non-accreting stars in Chamaeleon I, Orion OB1, Upper Scorpius, Velorum, and Upper Centaurus Lupus, using He I 10830 as a sensitive probe of accretion. We classify the line profiles into six types and argue that those showing redshifted and/or blueshifted absorption are still accreting. Using these classifications,…
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