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Deep Narrow Band Interference Filter Photographs of Selected Extended Planetary Nebulae
Published online by Cambridge University Press: 19 July 2016
Abstract
Narrow-band interference filter photographs in the light of Hα, [S II] (λ = 6717 and 6731 A). [N II] (λ = 6584 A) and [O III] (λ = 4363 A) of four extended PNs are shown. These photographs were obtained with a focal reducer and a single-stage image tube attached to the 2.1 m Cassegrain focus telescope of the Observatorio Astronómico Nacional at San Pedro Mártir, B.C.N. The exposure times were of one hour. For each photograph we have obtained a calibration by means of a step density wedge.
- Type
- II. Nebular Properties
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- Copyright © Kluwer 1989