FOS Observations of Solar Analog Standards

Details FOS Observations of Solar Analog Standards FOS Observations of Solar Analog Standards

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6925c&link_type=abstract

HST Proposal ID #6925

Physics

Hst Proposal Id #6925 Cool Stars

Scientific paper

We request FOS observations of three selected solar analog stars to obtainan accurate absolute spectrophotometry of faint red stars in the 2200A to8500A wavelength range. These selected stars will be the primary standardsfor the absolute calibration of the near-infrared camera (NICMOS). The FOSspectra will be used in evaluating the accuracy of the method and assumptionsbehind the absolute calibration of NICMOS. The IDT proposed calibration isbased on broad band photometry of these stars, which defines the absoluteflux by assuming that the intrinsic spectra are identical to the solarspectrum. A detailed analysis of the differences in the spectral featuresand energy distribution of the selected G stars with respect to the referencespectrum of the Sun will be performed.So far, all HST standards are blue hot stars or white dwarfs with colorsB-V < -0.1. The four selected G stars will then be converted into new HSTstandards and added to the current sample of HST absolute calibrationstandards. These new faint red (B-V ~ +0.65) G stars are needed in thecalibration of the WFPC2 in order to measure broadband calibrationdifferences for precisely known flux distributions for red stars, as wellas the for blue stars that are currently used. Future HST spectrographs(STIS) can also make use of these red faint HST standards to measure levelsof grating scattered parasitic light.

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