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Infrarödfotometri: instrumentkonstruktion och observationer
Stockholm University, Faculty of Science, Department of Astronomy.
1986 (Swedish)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An infrared photometer has been constructed at the Stockholm Observatory, It has an InSb detector cooled by solid nitrogen, and is specially designed to be portable, to be used at existing telescopes, not adapted for IR-work and to be used under non-ideal photometric conditions.

The sky chopping, a differential measurement of the star and the background, necessary for infrared observations, Is accomplished by a cooled focal plane chopper with high efficiency,

The aperture stop, necessary for suppressing the infrared radiation from the surroundings, is of a new construction which gives high accuracy,

The filters, selecting the terrestrial infrared windows are cooled, and mounted in a filter wheel with 15 positions. Up to 7 of the filters can be used semi-simultaneously in a fast exchange mode to minimize the influence of nonstable atmospheric conditions.

The usable wavelengths range from visual to 5 urn and the limiting K magnitude is I l.m8 with a signal to noise of 1:1 in 1 sec with a I m telescope. This is comparable or superior to other existing photometers.

The photometer has been used for a programme with high-accuracy photometric observations of 70 late type stars, performed at the new Observatorio del Rogue de Los Muchachos on La Palma and at the Stockholm Observatory.

The stars were selected from the following cathegories: Late population II stars, M super giants . population I giants and carbon stars.The photometry included the I, J, H, and K bands 3nd two narrow bands measuring the CO first overtone band.

The mean accuracy achieved ranges from O^VOI to 0m.025 for the colours and O'".03 for the K magnitude. Some of the stars have been measured with an accuracy of 0nl.002. The values given are the standard deviations derived from several observations of each star at different, nights About 800 measurements were made including the observations of the extinction star and the photometric standard stars.

The results show that existing model stellar atmospheres do not successfully describe the colours of the redder carbon stars.

Place, publisher, year, edition, pages
Stockholm: Stockholm University, 1986. , p. 11
Keywords [sv]
Fotometri
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-174474Libris ID: 7608728ISBN: 91-7146-696-7 (print)OAI: oai:DiVA.org:su-174474DiVA, id: diva2:1358469
Public defence
1986-10-10, Föreläsningssalen vid Stockholms Observatorium, Stockholm, 13:00
Note

Härtill 2 uppsatser

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-12-13Bibliographically approved

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