Other
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8106l&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #81.06; Bulletin of the American Astronomical Society, Vol. 27, p.1403
Other
2
Scientific paper
We obtained high-resolution images of the planetary nebula BD+30°3639 using the HST WFPC2 instrument and the VLA telescope. Images were obtained in the emission lines Hβ , Hα , HeIlambda 5876, [O III]lambda 5007, [O II]lambda 3727, [O I]lambda 6300, [N II]lambda 6584, [S III]lambda 9532, [S II]lambda 6717,6731 and in the optically-thin radio continuum. These images reveal detailed structure not previously seen in this 7'' diameter nebula, clearly resolving the rectangular-shaped shell. In every emission line, significant flux is seen in a halo which extends, with exponentially decreasing brightness, to ~ 4'' beyond the ionized shell. The fraction of light in this halo ranges from 0.12 to 0.25. Most of this light is apparently scattered from dust in the neutral halo; however, some small-scale structure seen in [O I] and [S II] emission may be due to other processes. The Hβ and Hα images and the VLA radio flux map are used to calculate the extinction in the nebula and the quantity R=A_V/E_{B-V}. The reddening map determined from the Balmer decrement shows an east-west gradient across the nebula and reveals a large dust blob (c=1.2, twice the average value) superimposed on the northeast section of the shell. The VLA/Hβ map confirms a clumpy distribution of dust in the shell. There is a small gradient in R across the nebula and the mean value of R in BD+30 is found to be well below the standard ISM value of 3.1. Using theoretical dust models, we consider possible explanations for the anomalous extinction, such as a deficiency of large grains.
Borkowski Kazik
Harrington Phillip
Lame Nancy Joanne
White Simon
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