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10 μm heterodyne spectroscopy at telescopes with 1m aperture

Published online by Cambridge University Press:  04 August 2017

H. Rothermel ,
U. Schrey ,
H.U. Käufl  and
S. Drapatz
H. Rothermel
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Institut für Extraterrestrische Physik, 8046 Garching bei München, FRG
U. Schrey
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Institut für Extraterrestrische Physik, 8046 Garching bei München, FRG
H.U. Käufl
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Institut für Extraterrestrische Physik, 8046 Garching bei München, FRG
S. Drapatz
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Institut für Extraterrestrische Physik, 8046 Garching bei München, FRG

Abstract

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Heterodyne spectroscopy combines high instrumental transmission with virtually unlimited spectral resolution. For 250 K bodies like Mars and Venus resolution is limited to 107 (= 30 m/s) because of photon statistics whereas for solar measurements the cm/s velocity range, desirable for study of solar oscillations, is feasible. Since a single heterodyne receiver is conserving its etendu, smaller collecting area results in larger field of view. The signal remains unchanged as long as the source is large enough to fill the beam. For Mars, Venus and the Sun heterodyne observation with 1m aperture is competitive.

Type
III. Spectroscopic Research Programmes
Information
Symposium - International Astronomical Union , Volume 118: Instrumentation and Research Programmes for Small Telescopes , 1986 , pp. 431 - 433
Copyright
Copyright © Reidel 1986 

References

1. Siegman, A.E., Proc. IEEE 54, 1350 (1966)Google Scholar
2. Rothermel, H., Käufl, H.U., Yu, Y., Astron. Astrophys. 126, 387 (1983)Google Scholar
3. Schrey, U., Rothermel, H., Käufl, H.U., Drapatz, S., Astron. Astrophys. in press (1985)Google Scholar