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Bidimensional Spectroscopy with the 6-meter Telescope in Time Resolving Mode

Published online by Cambridge University Press:  12 April 2016

V. L. Afanasiev ,
S. N. Dodonov ,
S. V. Drabek  and
V. V. Vlasiouk
V. L. Afanasiev
Affiliation:
Special Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, Russia, 357147
S. N. Dodonov
Affiliation:
Special Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, Russia, 357147
S. V. Drabek
Affiliation:
Special Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, Russia, 357147
V. V. Vlasiouk
Affiliation:
Special Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, Russia, 357147

Extract

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Degradation of images of astronomical objects during observations with large optical telescope may be described as combination of atmosphere turbulence on a time scale shorter than some tenths of a second and random fluctuation of object’s position due to telescope and observer’s guiding errors, bending of construction under external factors (wind, etc.). Special investigations on the 6-meter telescope (Balega, 1989) showed, that the peak frequency of such low-frequency fluctuations is located near 1 Hz.

The method of Time Resolving Image Mode, developed by J.-L.Nieto et al (1987) for post-detection improvement of angular resolution at CFHT, showed that, even in places with excellent quality of atmosphere, the resolution of large telescope may be increased by 20-30% only, although powerful methods of image recentering and frames selection were performed. Moreover, such method of data processing may be applied to relatively bright objects only. For 6-meter telescope, resolution improvement would be useless at all due to smaller Fried parameter and larger main mirror.

Type
3. Integral Field Spectrographs and Spectrometers
Information
International Astronomical Union Colloquium , Volume 149: Tridimensional Optical Spectroscopic Methods in Astrophysics , 1995 , pp. 276 - 277
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Afanasiev, V.L., Grudzinskij, M.A., Katz, B.M., Noshchenko, V.S., & Zukkerman, I.I., 1986, in Avtomatizirovannye systemy obrabotki informacii (in Russian), Moscow: Nauka, 182 Google Scholar
Afanasiev, V.L., Vlasiouk, V.V., Dodonov, S.N., & Sil’chenko, O.K., 1990, Preprint SAO, N54.Google Scholar
Balega, Ju.Ju., 1989, private communicationGoogle Scholar
Nieto, J.-L., Llebaria, A., di Serego Alighieri, S., 1987, A&A, 178, 301.Google Scholar