On the spectroscopic detection of faint haloes and reflection nebulae around planetary nebulae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Halos, Planetary Nebulae, Reflection Nebulae, Far Fields, Seeing (Astronomy)

Scientific paper

Attention is drawn to problems involved in the detection of low surface-brightness haloes around bright planetary nebulae and similar objects. These include the far-field scattering or seeing profile and the faint diffuse galactic background. The former effect is illustrated with new observations of compact planetaries and published surface-brightness profiles. The scattering efficiency is found to rise sharply below 4000 A at La Palma, from observations around BD + 30 deg 3069. This is interpreted as due to telescopic and atmospheric effects. Results for model reflection nebulae are compared with observations of scattered light around two planetaries. The reflection around NGC 7027 appears to be real.

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