Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184..477k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 184, Aug. 1978, p. 477-480.
Astronomy and Astrophysics
Astronomy
1
Infrared Astronomy, Novae, Stellar Envelopes, Stellar Luminosity, Diameters, H Lines, Instrument Errors, Normal Density Functions, Spatial Distribution, Stellar Spectrophotometry, Wavelengths
Scientific paper
Infrared observations of the cool shell around Eta Car between 3.7 and 12.2 microns were obtained by a described method which is comparable to iris-photometry of photographic plates. Half-flux diameters, which increase smoothly with wavelength from 2.7 arcsec to 6.5 arcsec, were calculated; circular symmetry and Gaussian intensity distribution are assumed. The importance of deviations from simple Gaussian shape was estimated by performing a deconvolution which applies the sum of the two Gaussians for both the observed and the instrumental response functions. The half-flux diameters calculated by this method were typically 25% lower than the values found by the first method, and reasons for preferring the first set of values are presented.
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