Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
Empirical Determination Of Convection Parameters In White Dwarfs. I. Whole Earth Telescope Observations Of Ec14012-1446, Judith L. Provençal, Matt A. Wood, Stéphane Vennes, Péter Németh
Empirical Determination Of Convection Parameters In White Dwarfs. I. Whole Earth Telescope Observations Of Ec14012-1446, Judith L. Provençal, Matt A. Wood, Stéphane Vennes, Péter Németh
Aerospace, Physics, and Space Science Faculty Publications
We report on an analysis of 308.3 hr of high-speed photometry targeting the pulsating DA white dwarf EC14012-1446. The data were acquired with the Whole Earth Telescope during the 2008 international observing run XCOV26. The Fourier transform of the light curve contains 19 independent frequencies and numerous combination frequencies. The dominant peaks are 1633.907, 1887.404, and 2504.897μHz. Our analysis of the combination amplitudes reveals that the parent frequencies are consistent with modes of spherical degree l = 1. The combination amplitudes also provide m identifications for the largest amplitude parent frequencies. Our seismology analysis, which includes 2004–2007 archival data, confirms …
Observational Constraints On The Degenerate Mass-Radius Relation, Jay B. Holberg, Terry D. Oswalt, M A. Barstow
Observational Constraints On The Degenerate Mass-Radius Relation, Jay B. Holberg, Terry D. Oswalt, M A. Barstow
Aerospace, Physics, and Space Science Faculty Publications
The white dwarf mass-radius relationship is fundamental to modern astrophysics. It is central to routine estimation of DA white dwarf masses derived from spectroscopic temperatures and gravities. It is also the basis for observational determinations of the white dwarf initial-final-mass relation. Nevertheless, definitive and detailed observational confirmations of the mass-radius relation (MRR) remain elusive owing to a lack of sufficiently accurate white dwarf masses and radii. Current best estimates of masses and radii allow only broad conclusions about the expected inverse relation between masses and radii in degenerate stars. In this paper, we examine a restricted set of 12 DA …