An Atlas of Spectrophotometric Landolt Standard Stars

Details An Atlas of Spectrophotometric Landolt Standard Stars An Atlas of Spectrophotometric Landolt Standard Stars

2005-04-11

arxiv.org/abs/astro-ph/0504244v2

Astronomy and Astrophysics

Astrophysics

Added referee's comments, minor corrections, replaced Table 10

Scientific paper

10.1086/431468

We present CCD observations of 102 Landolt standard stars obtained with the R-C spectrograph on the CTIO 1.5 m telescope. Using stellar atmosphere models we have extended the flux points to our six spectrophotometric secondary standards, in both the blue and the red, allowing us to produce flux-calibrated spectra that span a wavelength range from 3050 \AA to 1.1 \micron. Mean differences between UBVRI spectrophotometry computed using Bessell's standard passbands and Landolt's published photometry is found to be 1% or less. Observers in both hemispheres will find these spectra useful for flux-calibrating spectra and through the use of accurately constructed instrumental passbands be able to compute accurate corrections to bring instrumental magnitudes to any desired standard photometric system (S-corrections). In addition, by combining empirical and modeled spectra of the Sun, Sirius and Vega, we calculate and compare synthetic photometry to observed photometry taken from the literature for these three stars.

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