Seminar
Chemical Cartography in the Milky Way with SDSS/APOGEE
Abstract
The SDSS Apache Point Observatory Galactic Evolution
Experiment (APOGEE) has
collected high resolution near-IR spectra of several hundred thousand stars
across the Milky Way. I'll describe some observational results about the
spatial variation of chemical abundances as a function of Galactocentric
radius and distance from the midplane, discussing mean abundances,
metallicity
distribution function, and the variation of abundance ratios of multiple
elements. Additional information related to stellar ages can be obtained
from [C/N] for red giant stars. Several lines of evidence suggest that
radial
migration has had a significant impact on the Galactic disk. The
observed patterns of
abundance ratios may provide observational constraints on
nucleosynthetic yields.
About the talk
Fundacion Jesus Serra
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spatial variation of chemical abundances as a function of Galactocentric
radius and distance from the midplane, discussing mean abundances,
metallicity
distribution function, and the variation of abundance ratios of multiple
elements. Additional information related to stellar ages can be obtained
from [C/N] for red giant stars. Several lines of evidence suggest that
radial
migration has had a significant impact on the Galactic disk. The
observed patterns of
abundance ratios may provide observational constraints on
nucleosynthetic yields.&location=&trp=false&ctz=Atlantic/Canary' target='_blank' rel='nofollow' class='btn btn-primary btn-sm text-light' title='Export to Google Calendar'> Google Calendar
About the speaker
Prof. Jon Holtzman obtained his PhD from the University of
California, Santa
Cruz. He worked at the Lowell Observatory before moving to the New
Mexico State
University, where he is currently the Department Head in the Department of
Astronomy.
His main research interests are in the areas of stellar populations and data
analysis and calibration. He is currently the Survey Scientist for the
APOGEE-2
project of the Sloan Digital Sky Survey. At the IAC, Dr. Holtzman will be
working with members of the stellar group to improve the analysis of the
APOGEE
spectra before the final data release. He will also work on extending his
studies of the chemical cartography of the Milky Way disk, and will be
consulting with the galaxies group to develop ideas and techniques to take
advantage of the synergy between analyses of the Milky Way and that of
external
galaxies.