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Evidence for Enhanced Helium Enrichment from Asteroseismology
Miqaela K. Weller, Marc H. Pinsonneault, Jennifer A. Johnson +1
The helium abundance of a star has a dramatic effect on luminosity, internal structure, and evolutionary timescales, yet direct helium measurements are unavailable for most stars.…
A Broken Clock Is Right Twice a Day: [Ce/Mg] Is Not a Universal Chemical Clock
Liam O. Dubay, Jennifer A. Johnson, James W. Johnson +14
The ratio of -process to -element enrichment () has been proposed as a ``chemical clock,'' or a means to estimate stellar ages. However, the age-- relation vari…
[C/N] Ages and Extra-Mixing for [Fe/H] <- 0.5: Insights from the LMC and SMC
Yuxi Lu, John D. Roberts, Joshua T. Povick +4
The [C/N]-age relation has become a powerful tool for reconstructing the formation history of the Milky Way (MW), providing the largest age sample for field giant stars. However, a…
Checking It Twice: Using [C/N]-Masses and Asteroseismic Masses as a Diagnostic of Mass Loss and Transfer on the RGB
John D. Roberts, Marc H. Pinsonneault, Jennifer A. Johnson +1
The surface [C/N] of red giants is correlated with birth mass, but not directly impacted by mass loss. Exploiting this, we compare asteroseismic masses of red giants with the same…