Faint Standard Extension

Details Faint Standard Extension Faint Standard Extension

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8849b&link_type=abstract

HST Proposal ID #8849

Statistics

Hst Proposal Id #8849

Scientific paper

Fainter standard stars are needed for the flux calibration of COS, while reobservations are required to check for variability and to improve S/N. The four pure hydrogen WD standard stars from the original FASTEX proposal 8423 will satisfy these requirements and provide useful new standards for the community. Since these stars are selected by D. Finley to be pure hydrogen, the models provide the shape of flux reference, while the STIS CCD spectrum sets the absolute level of the fluxes. The UV STIS spectra are also required to measure the small or negligible interstellar reddening. In addition, even fainter standards are required for the prism modes on ACS. The faint stars of NGC6681 observed first in cal proposal 8422 are appropriate but must be reobserved to verify stability and improve the S/N. Finally, Bohlin {2000, AJ, July} found a 2-3 sigma deviation of the observed flux of HZ43 and G191B2B from their models. An additional pair of observation of these two stars will i mprove the broadband statistics by doubling the number of observed low dispersion spectra from 2 to 4 and should resolve the question of whether the deviations from the model are due to instrumental effects or to problems with the model atmospheres.

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