Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..315s&link_type=abstract
Astronomy and Astrophysics, vol. 79, no. 3, Nov. 1979, p. 315-328.
Astronomy and Astrophysics
Astronomy
37
Infrared Astronomy, Interferometry, Protostars, Speckle Patterns, Bandwidth, Power Spectra, Signal To Noise Ratios, Transfer Functions
Scientific paper
Speckle interferometry techniques are extended to the near infrared range (2-5 microns), showing the instantaneous atmospheric modulation transfer function (AMTF), exposure time, and atmospheric differential refraction to be wavelength-dependent. A scanning-slit method of image analysis with a single detector is developed, and the computed signal-to-noise ratio gives limiting magnitudes of 6-7 for the K, L, and M bands, with a 1 hr integration time. The AMTF calculated by means of the log-normal model for the wavefront provides excellent quantitative agreement with point source results; applying the method to an extended source, NML Cyg, this power spectrum was reconstructed at three wavelengths (K, L, and M) and diameters for this object were derived. Comparisons of signal-to-noise ratios by this technique and by Michelson spatial interferometry reveal the advantages of speckle interferometry and present it as a powerful method for studying protostellar candidates and evolved envelope stars.
Chelli Alain
Léna Pierre
Sibille Francois
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