The Problem with Reddening Distances to Planetary Nebulae

Details The Problem with Reddening Distances to Planetary Nebulae The Problem with Reddening Distances to Planetary Nebulae

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxaa..42..229p&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 42, pp. 229-239 (2006)

Astronomy and Astrophysics

Astronomy

3

Ism: Jets And Outflows, Planetary Nebulae: General

Scientific paper

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 E_{B-V} are low to undetectable. This is likely to invalidate certain previous estimates of their reddening distances D_{RED}. It also means that larger scale analyses, such as those of Pottasch (1984) and Acker (1973), lead to values of D_{RED}] 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.

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