ASTEROSEISMIC ESTIMATE OF HELIUM ABUNDANCE OF A SOLAR ANALOG BINARY SYSTEM

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Verma, Kuldeep (Autor) Outra; Faria, JP (Autor) FCUP; Antia, HM (Autor) Outra; Sarbani Basu (Autor) Outra; Anwesh Mazumdar (Autor) Outra; Monteiro, MJPFGM (Autor) FCUP; Thierry Appourchaux (Autor) Outra; William J Chaplin (Autor) Outra; Rafael A Garcia (Autor) Outra; Travis S Metcalfe (Autor) Outra

Revista

Título: Astrophysical Journal

Vol. 790

Página Final: 138

ISSN: 0004-637X

Editora: American Astronomical Society

Indexação

ISI Web of Knowledge - 48 Citações

Scopus - 50 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Astronomia

Outras Informações

ID Authenticus: P-009-MKT

DOI: 10.1088/0004-637x/790/2/138

Abstract (EN): 16 CygA and B are among the brightest stars observed by Kepler. What makes these stars more interesting is that they are solar analogs. 16 Cyg A and B exhibit solar-like oscillations. In this work we use oscillation frequencies obtained using 2.5 yr of Kepler data to determine the current helium abundance of these stars. For this we use the fact that the helium ionization zone leaves a signature on the oscillation frequencies and that this signature can be calibrated to determine the helium abundance of that layer. By calibrating the signature of the helium ionization zone against models of known helium abundance, the helium abundance in the envelope of 16 CygA is found to lie in the range of 0.231 to 0.251 and that of 16 Cyg B lies in the range of 0.218 to 0.266.

Idioma: Inglês

Tipo (Avaliação Docente): Científica