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 March 14
Accepted 2006 May 16
]]> RESUMEN
Observamos que la vasta mayoría de NP's galácticas están localizadas fuera de la capa de enrojecimiento interestelar, de manera que los gradientes locales en EB-V son bajos y llegan a ser indetectables. Esto invalida ciertas estimaciones previas de sus distancias de enrojecimiento DRED. Significa también que los análisis realizados a gran escala, como los de Pottasch (1984) y Acker (1973), llevan a valores de DRED que son demasiado bajos.
Una crítica similar se aplica a los análisis basados en medidas de la línea D de absorción del Na, y posiblemente muchas de las distancias de Napiwotzki & Schönberner (1995) estén erradas.
ABSTRACT
It is noted that the vast majority of Galactic PNe are located outside of the interstellar reddening layer, to the extent that local gradients in EB-V are low to undetectable. This is likely to invalidate certain previous estimates of their reddening distances DRED. It also means that larger scale analyses, such as those of Pottasch (1984) and Acker (1973), lead to values of DRED which are significantly too small.
A similar critique applies to analyses based on measures of Na D-line absorption, and it seems likely that most of the distances of Napiwotzki & Schönberner (1995) are similarly in error.
Key Words: ISM: JETS AND OUTFLOWS - PLANETARY NEBULAE: GENERAL.
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