Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20714802p&link_type=abstract
American Astronomical Society Meeting 207, #148.02; Bulletin of the American Astronomical Society, Vol. 37, p.1406
Astronomy and Astrophysics
Astronomy
Scientific paper
We have explored the effect of non-solar abundance ratios on age determinations of galaxies from integrated light observations of the Hdelta line. We have measured Hdelta using index definitions designed to assess contamination from the CN molecule in and around Hdelta by choosing combinations of bandpasses that both avoid and include a region of CN molecular lines redward of Hdelta. We find systematic differences in the ages derived from Hdelta measurements among the various definitions when extracting ages from Hdelta in old stellar populations. We propose that neighboring CN lines have a strong effect on continuum and central bandpass levels. We suggest using caution when extracting galaxy ages from the Hdelta line in the case of old stellar populations with significant non-solar abundance ratios. This study was funded by NSF grant AST-04-06443 to the University of North Carolina and by Hubble Space Telescope Treasury Program grant GO-09455.05-A to the University of Virginia.
Prochaska Leslie C.
Rose James A.
Schiavon Ricardo P.
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