A HRC-S LETG Observation of V4743 Sgr

Details A HRC-S LETG Observation of V4743 Sgr A HRC-S LETG Observation of V4743 Sgr

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1615s&link_type=abstract

Chandra Proposal ID #05308163

Physics

Chandra Proposal Id #05308163

Scientific paper

We have observed V4743 Sgr three times with CHANDRA (March, July, and September 2003) with our last cycle ToO program but are now out of time. We are requesting an additional observation to follow its evolution back to minimum. Our first observation found a large amplitude oscillation with a period of ~1300 s (see Sept 2003 ApJ Letters). Our Xray observations showed that the oscillations were multi periodic, and that the principal period is increasing. These results suggest that we are observing non-radial modes and that the surface characteristics of the WD are evolving on a few month time scale. We are analyzing the spectra and find that the white dwarf temperature at the first grating observation was about 600,000K. We are seeing the WD cool slightly with time. The light curve and spectral variations are very exciting and we would like to follow the evolution as long as there is nuclear burning on the white dwarf.

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