The true nature of the alleged planetary nebula W16-185

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dc.creatorRoman-Lopes, Alexandre
dc.creatorAbraham, Zulema
dc.date2006-01-04
dc.date.accessioned2026-07-07T11:25:08Z
dc.date.available2026-07-07T11:25:08Z
dc.descriptionWe report the discovery of a small cluster of massive stars embedded in a NIR nebula in the direction of the IRAS15411-5352 point source, which is related to the alleged planetary nebula W16-185. The majority of the stars present large NIR excess characteristic of young stellar objects and have bright counterparts in the Spitzer IRAC images; the most luminous star (IRS1) is the NIR counterpart of the IRAS source. We found very strong unresolved Brgamma emission at the IRS1 position and more diluted and extended emission across the continuum nebula. From the sizes and electron volume densities we concluded that they represent ultra-compact and compact HII regions, respectively. Comparing the Brgamma emission with the 7 mm free-free emission, we estimated that the visual extinction ranges between 14 and 20 mag. We found that only one star (IRS1) can provide the number of UV photons necessary to ionize the nebula.
dc.description30 pages, 15 figures, 2 tables V3: minor grammatical changes. Figure 4 is available in pdf file. Accepted for publication in AJ, April / 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0601064
dc.identifierhttp://arxiv.org/abs/astro-ph/0601064
dc.identifierAstron.J.131:2223-2232,2006
dc.identifierdoi:10.1086/500428
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195419
dc.subjectAstrophysics
dc.titleThe true nature of the alleged planetary nebula W16-185
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