Beobachtungen des Kometen 1932k (<i>Peltier‐Whipple</i>)

Kipper, A.; Muischnek, H.

doi:10.1002/asna.19332480204

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“…The authors who first dealt with the visual continuum of the Orion Nebula longward of the Balmer discontinuity, attributed this light mainly to that scattered by dust particles HENYEY 1939, GREENSTEIN 1946). It was realized somewhat later that the hydrogen atom is capable of emitting an extended continuum connected with the decay of its metastable 2s state and the simultaneous emission of two quanta hv and hv', where v + v' = vo is the frequency of L y a (MEYER-GOPPERT, 1931; KIPPER, 1950;SPITZER and GREENSTEIN, 1951). SHAJN, HAZE and PICKELNER (1954) with measurements of the intensity ratio of the yellow continuum to H a in magnitudes m, and mHa per square minute of arc for 20 emission type nebulae, inferred that almost all nebulae, and also different areas of given nebulae, followed the relation m, = mHa + 2.79 f 0.09.…”

Section: Introductionmentioning

confidence: 99%

The dust continuum in the orion nebula

Wurm¹

1971

Astron Nachr

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Spectra of the Orion Nebula with a long slit (7' and 3' in the sky) and with exposures to the appearance of the visual continuum have been obtained for several positions in the field including, in particular, areas of low surface brightness. The variation of the ratio q = intensity of Balmer emission / intensity of continuous emission is studied. This ratio changes generally rather irrcgularly along the length of the slit and also from position to position. The spatial variation of q is generally small with the exception of the center of the nebula, where it is particularly high. The variation of the ratio q can be seen with a much higher surface resolution than in the spectra, when comparing monochromatic photographs taken in H a + [NII] with those taken in the continuum between rhc stronger emission lines. Within the larger part of the field of the nebula it is possible to distinguish between surface structures typical of the continous emission and those typical of the hydrogen line emission. The persistence of this differentiation in many areas below the Balmer discontinuity as well as above H a in the near infrared proves that for the subareas with the stronger continuum the continuous qmission must be predominantly scattered light for the entire wavelength range from the ultraviolet to the near infrared. This criterion cannot be applied to areas where there exist no clear differences in the surface structure of the two types of emission. A determination of the Balmer and Paschen discontinuity may possibly lead to a decision.

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Section: Introductionmentioning

confidence: 99%