Detection of a new type of condensations in the center of the Orion Nebula by means of S20 photocathode cells associated with a Lallemand electronic camera

Details Detection of a new type of condensations in the center of the Orion Nebula by means of S20 photocathode cells associated with a Lallemand electronic camera Detection of a new type of condensations in the center of the Orion Nebula by means of S20 photocathode cells associated with a Lallemand electronic camera

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73...97l&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 97-106. In French.

Astronomy and Astrophysics

Astrophysics

109

Astronomical Photography, Electron Density (Concentration), Interstellar Matter, Lallemand Cameras, Nebulae, Photocathodes, Atmospheric Turbulence, Calibrating, Condensation, Ionized Gases, Stellar Models, Submillimeter Waves

Scientific paper

Photographs were taken primarily of the O III 5007 A, H alpha 6563 A and N II 6584 A emission lines through narrow band (10 A) interference filters with S11 and S20 photocathodes. Condensations of matter were observed as point sources in the region of the trapezium at H alpha, H beta and O III wavelengths and are considered to be nonstellar and dissimilar to Bok globules or Herbig-Haro objects. Electron density within the structures was calculated to be at least 1.5 to 4.1 x 10 to the 5th/cu cm by means of a spherically homogeneous model, and compared to the value given by the O III/H alpha ratio of 2.2 to 3.6 x 10 to the 6th/cu cm. Calculations show that these condensations cannot be totally ionized and it is proposed that they consist of partially ionized globules of diameter 0.19 to 0.40 arcsec with neutral interiors.

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