Surface Abundance Patterns in A-Type Stars from UV Spectral Synthesis

Details Surface Abundance Patterns in A-Type Stars from UV Spectral Synthesis Surface Abundance Patterns in A-Type Stars from UV Spectral Synthesis

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832303f&link_type=abstract

American Astronomical Society, AAS Meeting #218, #323.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

In this poster, we present results from a program whose goals are to (1) examine the degree to which current LTE atmosphere models can reproduce the complex UV spectra (1200-3200 A) of the A-type stars; in order to (2) develop better estimates of the physical properties, including composition, for specific target stars with available archival UV data; and (3) examine the abundance patterns revealed from a large group of normal and peculiar A-type stars to gain insight into the processes driving the compositional anomalies often observed in this spectral domain. We use the ATLAS9 atmospheric structure models from R.L. Kurucz, the spectral synthesis program SPECTRUM from R. Gray, and a new atomic line list developed from data in the VALD and NIST archives. For most of the stars, the data are high-dispersion spectrophotometry from the IUE satellite, although in several cases very high quality HST spectroscopy from GHRS and STIS are available. In addition to measurements of effective temperature, surface gravity, mictrotubulence velocity, and rotational velocity, we are also able to determine abundances for over 30 elements per star, including CNO, the light metals, the Fe group, and a number of heavy elements. We illustrate the striking abundance patterns for a number of stars, including members of the Am and HgMn classes, along with several ``normal'’ and ``superficially normal'’ stars. This research has been supported by NASA Astrophysics Data Program grant NX08AJ62G.

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