Standardization work for the calibration of intensities of celestial objects

Details Standardization work for the calibration of intensities of celestial objects Standardization work for the calibration of intensities of celestial objects

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lubr.rept.....l&link_type=abstract

Final Report Louisiana State Univ., Baton Rouge. Dept. of Physics and Astronomy.

Astronomy and Astrophysics

Astronomy

Calibrating, Celestial Bodies, Data Acquisition, Stellar Spectrophotometry, Astronomical Observatories, Brightness, Color, Telescopes

Scientific paper

Observations of celestial phenomena need to be calibrated, to be related, to some measurable quantity. There continues to be a long-term need for accurate photometric standard stars, those with known intensities and colors, so that brightness and color measurements made of various celestial phenomena by different observers can be integrated and compared with one another. Toward this end, the author has been emphasizing data collection in recent years for stars of 'intermediate' brightness, those approximately in the magnitude range 11.5 is less than V is less than 16.0. Photoelectric data were obtained at the Cerro Tololo InterAmerican Observatory's (CTIO) telescopes for stars in certain selected areas near the celestial equator. Stars of extreme color outside the selected areas, but near the equator, also were selected to provide a more broad and complete range in color index. It was proposed to complete the photoelectric phase of the program. The author proposed developing extremely faint sequences of photometric standard stars useful for both large space-based detectors and for land-based detectors. These data were to be collected via charge-coupled devices (CCD's) at telescopes located at CTIO and at the Las Campanas Observatory (LCO), both observatories being located in Chile. It was hoped that accurate data could be collected down to the 21st or 22nd magnitude.

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