ASTEROSEISMIC ESTIMATE OF HELIUM ABUNDANCE OF A SOLAR ANALOG BINARY SYSTEM

• Type: Article in International Scientific Journal
• Date: 2014

Authors

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

Journal

Title: Astrophysical Journal

Vol. 790

Final page: 138

ISSN: 0004-637X

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 48 Citations

Scopus - 50 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

CORDIS: Physical sciences > Astronomy

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific