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Small Galactic Nebulae

Published online by Cambridge University Press:  04 August 2017

Yervant Terzian
Affiliation:
NAIC, Cornell University, Ithaca, NY and Arecibo, P.R., USA
Kenneth C. Turner
Affiliation:
NAIC, Cornell University, Ithaca, NY and Arecibo, P.R., USA

Extract

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We have performed high resolution VLA radio observations for several small H II regions, including the cluster emission nebulae S258, S255, S257, and S256. The region (PP56) between S255 and S257 at λ2 cm reveals significant flux structure close to OH, H2O and infrared emitting sources as shown in Figure 1. The flux densities and positions are indicated in Table 1. Observations of the cometary nebula PP59 (S269) also reveal similar characteristics as shown in Figure 2. These regions are considered to be active star-forming clouds. The cometary nebula PP40 was also observed and we note that its physical parameters are very similar to those of a typical planetary nebula.

Type
I. Star Forming Processes in the Solar Neighborhood
Copyright
Copyright © Reidel 1987