Observations of ZZ Ceti Stars

Details Observations of ZZ Ceti Stars Observations of ZZ Ceti Stars

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.1093b&link_type=abstract

HST Proposal ID #1093

Physics

Hst Proposal Id #1093

Scientific paper

The ZZ Ceti Stars are pulsating DA white dwarfs with temperatures near 11,000K. They are all pulsating in the non-radial g-modes, and are multi-periodic with periods between 200 sec and 1200 sec. Two major uncertainties about the ZZ Ceti stars are first, the exact temperature limits of the ZZ Ceti instability strip, and second, whether the luminosity variations are entirely due to temperature variations - as they should be if the pulsations are g-mode pulsations. We propose to observe the ZZ Ceti stars with the high speed photometer to measure their mean colors (and thus mean temperatures) and their color variations (and thus their temperature variations). Revision History: Received on RPS 9/1/89; Added to SCCS 9/5/89 Updated to V2 prop instr; RPSS V7.2 remote & local; Added data-fmt - SALM 9/7/89; Text changes - SALM 9/28/89; Reduce Texp to 6H - SALM 2/14/90 MJN 3/20/92 - removed prism mode and moved observation to UV2. Split observation to two 3 hour runs in the F184W and F284M filters.

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