Measuring the vertical age structure of the Galactic disc using asteroseismology and SAGA
Casagrande, Luca; Aguirre, V Silva; Schlesinger, Katharine; Stello, Dennis; Huber, D; Serenelli, A. M.; Schonrich, Ralph; Cassisi, S; Pietrinferni, A; Hodgkin, S.; Milone, Antonino; Feltzing, Sofia; Asplund, Martin
The existence of a vertical age gradient in the Milky Way disc has been indirectly known for long. Here, we measure it directly for the first time with seismic ages, using red giants observed by Kepler. We use Strömgren photometry to gauge the selection function of asteroseismic targets, and derive colour and magnitude limits where giants with measured oscillations are representative of the underlying population in the field. Limits in the 2MASS system are also derived. We lay out a method to...[Show more]
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|Source:||Monthly Notices of the Royal Astronomical Society|
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