Upgrading CRIRES-VLT to cross-dispersed mode

• The cryogenic high resolution IR echelle spectrograph CRIRES is the ESO infrared (0.95-5.4 μm) high resolution spectrograph operating at the Nasmyth A focus of VLT-UT1. The instrument provides long-slit (31″) spectroscopy with resolving power up to R=100,000 over a quite narrow wavelengths range, about 1/70 of the central wavelength. Observations of compact objects (e.g. stellar photospheres) could be made much more efficient by implementing a cross-dispersed mode, which increases the simultaneous spectral coverage by an order of magnitude or more. This paper presents the design of a relatively simple system to add cross-dispersed modes to CRIRES with a minimum impact on the instrument optics and mechanics.

Nyckelord

Ground based infrared instrumentation

Infrared spectrometers

Central wavelength

Compact objects

Echelle spectrograph

High resolution

Simple system

Spectral coverage

Stellar photospheres

Astronomy

Instruments

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)