Red Spectrophotometry of Landolt Photometric Standards

Details Red Spectrophotometry of Landolt Photometric Standards Red Spectrophotometry of Landolt Photometric Standards

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..282s&link_type=abstract

NOAO Proposal ID #2001A-0282

Physics

Scientific paper

In a previous proposal, we were granted time to obtain spectrophotometry of a sample of Landolt standards in the wavelength region 3100-10300Å. This spectrophotometry will be used along with our atlas of supernova spectrophotometry to explore the systematic effects of using filter+detector transmission functions that differ from the standard UBV(RI)_KC prescriptions. These data will allow us to calculate ``S-corrections'' from the transformed natural system to the standard system in a manner similar to a K-correction. Data taken on the CTIO 0.9m and YALO telescopes of the bright supernova SN1998bu show that systematic errors of 0.1m can occur in the transformed photometry even when local standards (in the CCD frame) are used. In this proposal, we are asking for two extra nights to recalibrate the red tilt, 6500-10300Å. Since the time of our previous proposal, Bessell (1999) has pointed out that there are small systematic errors in the Hamuy et al (1994) fluxes due to the lack of adequate ``flux points'' in the Hayes standards in the red. He has provided a list of featureless standards which can be used in the data reduction to greatly reduce the errors introduced by the standard technique of spline fitting across telluric features. We can add these new data to the data already reduced to improve the quality of the Hayes fluxes and ultimately the Landolt spectrophotometry.

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