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On the spectroscopic detection of faint haloes and reflection nebulae around planetary nebulae
Attention is drawn to problems involved in the detection of lowsurface-brightness haloes around bright planetary nebulae and similarobjects. These include the far-field scattering or seeing profile andthe faint diffuse galactic background. The former effect is illustratedwith new observations of compact planetaries and publishedsurface-brightness profiles. The scattering efficiency is found to risesharply below 4000 A at La Palma, from observations around BD + 30 deg3069. This is interpreted as due to telescopic and atmospheric effects.Results for model reflection nebulae are compared with observations ofscattered light around two planetaries. The reflection around NGC 7027appears to be real.
| Stellar Spectra in Milky way Regions. V.A Region in Monoceros.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1956ApJS....2..271M&db_key=AST
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Datos observacionales y astrométricos
| Constelación: | Unicornio |
| Ascensión Recta: | 06h53m04.68s |
| Declinación: | +00°12'10.8" |
| Magnitud Aparente: | 9.421 |
| Movimiento Propio en Ascensión Recta: | -4 |
| Movimiento Propio en Declinación: | -3.8 |
| B-T magnitude: | 9.521 |
| V-T magnitude: | 9.43 |
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