Radiative Signatures from the Cosmos, ASP Conference Series, Vol. 519, Proceedings of a conference held 23-26 October, 2018 at Sorbonne University, Paris, France. Edited by K. Werner, C. Stehle, T. Rauch, and T. Lanz. San Francisco: Astronomical Society of the Pacific, 2019, p.3
Allende Prieto, Carlos
While optical and quantum efficiency are on the rise, and spectrographs becoming massively multiplexed, measuring spectral energy distributions of astronomical sources with accuracy remains a challenge. In addition to atmospheric refraction, extinction, variability, and limited apertures of instrument entrance slits and optical fibers, accurate calibration is hampered by issues such as a limited choice of reliable standard stars. Modeling stellar spectral energy distributions has seen good progress, but some weaknesses survive, especially for late-type stars. This article provides an overview of these matters and discusses observation, calibration, and modeling strategies for future large spectroscopic surveys.