Precise surface gravities of δ Scuti stars from asteroseismology

Bibcode
2017MNRAS.471L.140G
DOI
10.1093/mnrasl/slx117
García Hernández, A.; Suárez, J. C.; Moya, A.; Monteiro, M. J. P. F. G.; Guo, Z.; Reese, D. R.; Pascual-Granado, J.; Barceló Forteza, S.; Martín-Ruiz, S.; Garrido, R.; Nieto, J.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society: Letters, Volume 471, Issue 1, p.L140-L144

Advertised on:
10
2017
Number of authors
11
IAC number of authors
1
Citations
32
Refereed citations
29
Description
The work reported here demonstrates that it is possible to accurately determine surface gravities of δ Scuti (δ 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 δ Sct component and the unique δ Sct star discovered with a transiting planet, WASP-33, we were able to refine the Δν-\bar{ρ } 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 Δν as a valuable observable for δ Sct stars and settles the degeneracy problem for the log g determination through spectroscopy.
Type
Refereed

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