Crossing HST and wet data for the pulsating DB white dwarf PG1351+489

Details Crossing HST and wet data for the pulsating DB white dwarf PG1351+489 Crossing HST and wet data for the pulsating DB white dwarf PG1351+489

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23q..91a&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 91-91

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Scientific paper

At discovery, the pulsating DB white dwarf PG1351+489 was initially thought to have the simplest power spectrum of all pulsating helium atmosphere white dwarf stars (DBVs). The high resolution power spectrum provided by the 1995 Whole Earth Telescope data allowed us to identify 18 pulsation frequencies: a dominating frequency fo (2043.59mHz), its four harmonics, three sets of frequencies which are equidistant from the main periodicity and from its harmonics (one of these may be a splitting due to rotation). With these results, we reanalised the 1996 Faint Object Spectrograph time-resolved ultraviolet spectroscopy obtained with the Hubble Space Telescope, together with the simultaneous photometry at the zeroth-order (undifracted) light. In this work, we fixed the frequencies identified in the WET data, due to its much higher time resolution than the HST data, and analised the ones which had amplitude higher than three times the average noise and out of power spectral resolution interference. We identified other frequencies not present at WET data, including a new set of fractional frequencies. The relative amplitude change with wavelenght for each periodicity was compared with the theoretical ones, to obtain the best temperature and gravity values for this star as well as the pulsation spherical degree identification.

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