IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Seismology of a Massive Pulsating Hydrogen Atmosphere White Dwarf
Autor/es:
S. O. KEPLER; I. PELISOLI; V. PECANA; J. E. S. COSTA; L. FRAGA; J. J. HERMES; D. E. WINGET; B. G. CASTANHEIRA; A. H. CÓRSICO; A. D. ROMERO; L. G. ALTHAUS; S. J. KLEINMAN; A. NITTA; D. KOESTER; B. KÜLEBI; S. JORDAN; A. KANAAN
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 757 p. 177 - 184
ISSN:
0004-637X
Resumen:
We report our observations of the new pulsating hydrogen atmosphere white dwarf SDSS J132350.28+010304.22.We discovered periodic photometric variations in frequency and amplitude that are commensurate with nonradialg-mode pulsations in ZZ Ceti stars. This, along with estimates for the star?s temperature and gravity, establishesit as a massive ZZ Ceti star. We used time-series photometric observations with the 4.1 m SOAR Telescope,complemented by contemporary McDonald Observatory 2.1 m data, to discover the photometric variability. Thelight curve of SDSS J132350.28+010304.22 shows at least nine detectable frequencies.We used these frequencies tomake an asteroseismic determination of the total mass and effective temperature of the star: M = 0.88±0.02Mand Teff = 12,100±140 K. These values are consistent with those derived from the optical spectra and photometriccolors.