| |
 |
| Paper: |
An Analysis of Metallic High Ion Absorption Line Profiles at DA White Dwarfs with Circumstellar Material |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
399 |
| Authors: |
Dickinson, N. J.; Barstow, M. A.; Welsh, B. Y. |
| Abstract: |
Some hot DA stars exhibit circumstellar absorption in the metal
resonance lines in their spectra. In many cases, these circumstellar
features are unresolved from those originating in the photosphere.
To better understand the effect this circumstellar blending has on
photospheric abundance estimates, we present here an analysis of the
unresolved metal high ion absorption features of six hot white
dwarfs. In all cases, given the strong circumstellar C IV
detections, the photospheric C IV abundances are reduced;
conversely the weak circumstellar Si IV leads to modest
photospheric abundance revisions. A possible new technique for
modeling these line profiles is discussed, that can better
reproduce the observations and provide a greater insight into the
conditions of the circumstellar medium. |
|
|
|
|
|
