From Hubble's Next Generation Spectral Library (NGSL) to Absolute Fluxes
Abstract
Hubble's Next Generation Spectral Library (NGSL) consists of R∼1000 spectra of 374 stars of assorted temperature, gravity, and metallicity. Each spectrum covers the wavelength range,
0.18-1.03 μ. The library can be viewed and/or downloaded from the website, http://archive.stsci.edu/prepds/stisngsl/. Stars in the NGSL are now being used as absolute flux standards at ground-based observatories. However, the uncertainty in the absolute flux is about 2%, which does not meet the requirements of dark-energy surveys. We have therefore developed an observing procedure, data-reduction procedure, and correction algorithms that should yield fluxes with uncertainties less than 1%.- Publication:
-
The Science of Calibration
- Pub Date:
- May 2016
- Bibcode:
- 2016ASPC..503..211H