Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..200n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 200-209.
Astronomy and Astrophysics
Astrophysics
61
Astronomical Photography, Astronomical Photometry, Nebulae, Stellar Evolution, Early Stars, Hydrogen Clouds, Infrared Imagery, Infrared Spectra
Scientific paper
The authors report on a search for hitherto unknown bipolar nebulae. The search was performed on the POSS prints; it covers nearly the total Milky Way north of δ = -30° and about 100 POSS fields outside the Milky Way. 20 probably bipolar nebulae found in this survey are presented together with UBVRI and infrared photometry, infrared photography and in some cases spectroscopic observations. Most of the central stars identified in these nebulae are of early spectral type. Their visual extinction reaches values up to 25 mag. About 10 objects show infrared excesses corresponding to emission temperatures of 500 - 1300K. In those cases where distances could be derived, the linear dimensions of the nebulae range between 0.1 and 1.3 pc.
Neckel Th.
Staude H. J.
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