On the Nature of Some Non-Radio Emitting Sharpless H II Regions

Details On the Nature of Some Non-Radio Emitting Sharpless H II Regions On the Nature of Some Non-Radio Emitting Sharpless H II Regions

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..26..115f&link_type=abstract

Astrophysics and Space Science, Volume 26, Issue 1, pp.115-122

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

Thirty four objects appearing in the SharplessCatalogue of H ii Regions with radio flux densities below 0.1 fu* at 1400 MHz, are studied. It is shown that two of them are planetary nebulae, two are reflection nebulae and two weak emission-reflection nebulae. From statistical arguments it is concluded that six may be evolved planetaries while the remaining are faint nearby H ii regions excited by stars of relatively advanced spectral type.

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