Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.278..143c&link_type=abstract
Nature, vol. 278, Mar. 8, 1979, p. 143-146.
Astronomy and Astrophysics
Astronomy
16
Early Stars, Infrared Astronomy, Protostars, Stellar Evolution, Stellar Mass Accretion, Infrared Interferometers, Modulation Transfer Function, Power Spectra, Stellar Models, Stellar Spectra
Scientific paper
A method of IR speckle interferometry that permits the spatial spectrum of an object in a given direction in the modulus sense to be determined up to the frequency cutoff of the telescope used has been applied to two protostellar candidates, the Becklin-Neugebauer (BN) object in the Orion nebula and W3IRS5, at wavelengths of 3.5 and 4.8 microns. The observational and processing techniques are described, and plots of power spectrum vs spatial frequency are provided for the two objects. Angular diameters of approximately 0.28 arcsec at 3.5 microns and 0.33 arcsec at 4.8 microns are determined for W3IRS5; the angular diameters obtained for the BN object are 0.1 arcsec at 3.5 microns and an upper limit of 0.1 arcsec at 4.8 microns. The results are taken to confirm that these two likely candidates for pre-main-sequence objects in the solar neighborhood are high-luminosity sources embedded in very compact heated shells.
Chelli Alain
Léna Pierre
Sibille Francois
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