Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6011c&link_type=abstract
HST Proposal ID #6011
Other
Hst Proposal Id #6011 Hot Stars
Scientific paper
The pulsations of white dwarf stars reveal information about their interiors not accessible by any other means. We can use this information to test theories of white dwarf formation and evolution, and to improve calculations of their cooling rates, making them better chronometers for measuring the age and star formation history of our galaxy. To extract all the information provided by white dwarf pulsations, it is not enough to measure pulsation periods, we must identify the indices which describe the pulsation modes (k, l, and m). HST photometry acquired in November 1993 allowed the first unambiguous identification of l for a ZZ Ceti star (RY LMi = G117-B15A). The identification was possible because the pulsation amplitudes depend strongly on l at wavelengths shorter than 3000 A. We propose to exploit this dependence to measure the l value of the pulsations modes in the ZZ Ceti star PY Vul (=G185-32). We will use the FOS blue Digicon in RAPID readout mode and the G160L grating to acquire UV spectrophotometry with a sampling interval of 10 seconds. Because the pulsation modes in G185-32 are greater in number and shorter in period than those in G117-B15A, determining their l values will yield a more precise measure of G185-32's surface H layer mass. This precision will allow us to confirm or refute standard models of white dwarf formation.
No associations
LandOfFree
Time-Resolved Spectroscopy of the Pulsating DA White Dwarf PY VUL does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Time-Resolved Spectroscopy of the Pulsating DA White Dwarf PY VUL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-Resolved Spectroscopy of the Pulsating DA White Dwarf PY VUL will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1171691