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Revista mexicana de astronomía y astrofísica
versão impressa ISSN 0185-1101
Resumo
PHILLIPS, J. P.. The problem with reddening distances to planetary nebulae. Rev. mex. astron. astrofis [online]. 2006, vol.42, n.2, pp.229-239. ISSN 0185-1101.
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.
Palavras-chave : ISM [JETS AND OUTFLOWS]; PLANETARY NEBULAE [GENERAL].