Precise surface gravities of delta Scuti stars from asteroseismology

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Garcia Hernandez, AG (Author) Other; Suarez, JC (Author) Other; Moya, A (Author) Other; Monteiro, MJPFG (Author) FCUP; Guo, Z (Author) Other; Reese, DR (Author) Other; Pascual Granado, J (Author) Other; Barcelo Forteza, SB (Author) Other; Martin Ruiz, S (Author) Other; Garrido, R (Author) Other; Nieto, J (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 471

Pages: L140-L144

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 25 Citations

Scopus - 30 Citations

Scientific classification

CORDIS: Physical sciences > Astronomy

Other information

Authenticus ID: P-00N-26F

DOI: 10.1093/mnrasl/slx117

Abstract (EN): Thework reported here demonstrates that it is possible to accurately determine surface gravities of delta Scuti (delta Sct) stars using the frequency content from high-precision photometry and a measurement of the parallax. Using a sample of 10 eclipsing binary systems with a delta Sct component and the unique delta Sct star discovered with a transiting planet, WASP-33, we were able to refine the Delta nu-(rho) over bar. relation. Using this relation and parallaxes, we obtained independent values for the masses and radii, allowing us to calculate the surface gravities without any constraints from spectroscopic or binary analysis. A remarkably good agreement was found between our results and those published, extracted from the analysis of the radial velocities and light curves of the systems. This reinforces the potential of Delta nu as a valuable observable for delta Sct stars and settles the degeneracy problem for the log g determination through spectroscopy.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5