EPJ Web of Conferences
Volume 43, 201340th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs
|Number of page(s)||2|
|Section||Hot B Subdwarfs (SDB)|
|Published online||21 March 2013|
Improved determination of the atmospheric parameters of the pulsating sdB star Feige 48
1 Département de Physique, Université de Montréal, Succ. Centre-Ville, CP. 6128, Montréal, QC H3C 3J7, Canada
2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
3 Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
a e-mail: firstname.lastname@example.org
Given the importance of Feige 48 as an sdB pulsator, we sought to obtain the best possible estimates of its spectroscopic parameters with a grid of NLTE metal-blanketed model atmospheres constructed especially for that star. This small grid of 150 models includes 8 metallic elements whose abundances have been determined previously and reported in the literature. Our fitting procedure found the following parameters for Feige 48: Teff = 29 504 K, log g = 5.41 and log N(He)/N(H) = −2.90. These results are in very good agreement with previous spectroscopic estimates (which generally ignore either NLTE effects or metal blanketing), thus indicating that metal line-blanketing in NLTE – modeled for the first time here – is not a dominant factor in the atmosphere of Feige 48.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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