Asymmetries in limb darkening reanalyzed

Details Asymmetries in limb darkening reanalyzed Asymmetries in limb darkening reanalyzed

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..126...37e&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 126, March 1990, p. 37-45.

Physics

5

Limb Darkening, Solar Limb, Asymmetry, Error Analysis, Instrument Errors

Scientific paper

The cause of the asymmetries in limb darkening reported by Neckel and Labs (1987) is discussed on the basis of new stray-light-free observations. It was established that the systematic differences of 5th-order polynomials, found by Neckel and Labs, are produced by light differences in the collimation of spectrograph and telescope, resulting in a different stray-light distribution. It is concluded that the description of differences between two halves of a drift curve or scan is more realistically done by differences in residuals relative to the same analytic profile; and that the high-order polynomials may lead to an unrealistic description of the intensity distribution near the limb.

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