Improved determination of the atmospheric parameters of the pulsating sdB star Feige 48

M. Latour, G. Fontaine, P. Brassard, P. Chayer, E. M. Green

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publication40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars
Subtitle of host publicationFrom Red Giants to White Dwarfs, LIAC 2012
DOIs
StatePublished - 2013
Event40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs, LIAC 2012 - Liege, Belgium
Duration: Jul 9 2012Jul 13 2012

Publication series

NameEPJ Web of Conferences
Volume43
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

Conference40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs, LIAC 2012
Country/TerritoryBelgium
CityLiege
Period7/9/127/13/12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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