Density gradients and internal dust in the Orion nebula

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dc.creatorBinette, L.
dc.creatorGonzalez-Gomez, D.
dc.creatorMayya, Y. D.
dc.date2002-10-30
dc.date.accessioned2026-07-07T02:05:54Z
dc.date.available2026-07-07T02:05:54Z
dc.descriptionThe ionization structure of the Orion nebula can be described as a skin-like ionization structure on the surface of a dense cloud. We propose that a steep density stratification, increasing as a powerlaw ($n \propto x^{-2}$) function of distance x from the ionization front, exhibits properties which agree with our long-slit spectrum of the Orion nebula. For instance, there exist a unicity relation between both the Hbeta surface brightness or the ionization front [SII] density, and the scale L of the powerlaw, where L is the distance between the ionization front and the onset of the density near the exciting star. Internal dust is required to obtain a simultaneous acceptable fit of both the [SII] density and then Hbeta suface brightness observations. Nebular models containing small dust grains provide a better fit than large grains. The line ratio gradients observed along the slit are qualitatively reproduced by our density stratified models assuming a stellar temperature of 38000 K. Collisional deexcitation appears to be responsible for half of the gradient observed in the [NII] 5755/6583 temperature sensitive ratio. We propose that the empirical relationship found by Wen & O'dell between density and stellar distance may possibly be caused by a power-law density stratification.
dc.description7 figures, 10 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0210646
dc.identifierhttp://arxiv.org/abs/astro-ph/0210646
dc.identifierRevista Mexicana de Astronomia y Astrofisica, 2002, V. 38, p. 279-288
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5245
dc.subjectAstrophysics
dc.titleDensity gradients and internal dust in the Orion nebula
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