Indico will be down for maintenance starting at 5PM CST on Dec 12th 2023. Most Indico features will be available starting at 6:30CST. Registration for events involving Site Access and Badging will not be available until 9PM CST.
Large Surveys and Missions (UV/Optical/NIR)
(NASA's Goddard Space Flight Center)
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, 0.18-1.00 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 are therefore developing an observing procedure that should yield fluxes with uncertainties less than 1% and will take part in an HST proposal to observe about 15 stars using this new procedure.