J. P. Phillips
Instituto de Astronomía y Meteorología, Universidad de Guadalajara, Av. Vallarta No. 2602, Col. Arcos Vallarta, 44130 Guadalajara, Jalisco, México (jpp@cencar.udg.mx).
Received 2006 January 15
Accepted 2006 July 1
]]> RESUMEN
Analizamos la distribución de 482 nebulosas planetarias (NP's) en los planos Hα/Hβ−Hγ/Hβ and Hδ/Hγ−Hγ/Hβ. Mientras que la mayoría de las fuentes parecen tener cocientes de línea caso B, y decrementos normales de su desenrojecimiento, algunas parecen estar afectadas por auto-absorción Balmer. Hemos identificado 9 casos posibles, y 11 ejemplos probables donde tal absorción es importante. Aproximadamente la mitad de estas nebulosas son compactas y probablemente jóvenes.
La mayoría de las identificaciones previas de auto-absorción son dudosas, y no hay coincidencia entre nuestros candidatos y los de análisis anteriores.
ABSTRACT
We analyse the distribution of 482 planetary nebulae (PNe) within the Hα/Hβ−Hγ/Hβ and Hδ/Hγ−Hγ/Hβ planes. Whilst most sources appear to possess case B line ratios, and normal reddening decrements, certain of them also appear to be affected by Balmer self-absorption. We are able to identify 9 possible cases, and 11 probable examples where such absorption is important. Approximately half of these nebulae are compact, and probably quite young.
Most previous identifications of self-absorption are shown to be open to doubt, and there is no overlap at all between our present candidates, and those of previous analyses.
Key Words: ISM: JETS AND OUTFLOWS - PLANETARY NEBULAE: GENERAL.
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