3-D Photoionization Structure and Distances of Planetary Nebulae III. NGC 6781

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dc.creatorSchwarz, Hugo E.
dc.creatorMonteiro, Hektor
dc.date2006-04-24
dc.date2006-04-24
dc.date.accessioned2026-07-07T10:43:54Z
dc.date.available2026-07-07T10:43:54Z
dc.descriptionContinuing our series of papers on the three-dimensional (3-D) structures of and accurate distances to Planetary Nebulae (PNe), we present our study of the planetary nebula NGC6781. For this object we construct a 3-D photoionization model and, using the constraints provided by observational data from the literature we determine the detailed 3-D structure of the nebula, the physical parameters of the ionizing source and the first precise distance. The procedure consists in simultaneously fitting all the observed emission line morphologies, integrated intensities and the 2-D density map from the [SII] line ratios to the parameters generated by the model, and in an iterative way obtain the best fit for the central star parameters and the distance to NGC6781, obtaining values of 950+-143pc and 385 Lsun for the distance and luminosity of the central star respectively. Using theoretical evolutionary tracks of intermediate and low mass stars, we derive the mass of the central star of NGC6781 and its progenitor to be 0.60+-0.03 Msun and 1.5+-0.5 Msun respectively.
dc.description16 pp, 6 figues, 2 tables, submitted to the ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0604501
dc.identifierhttp://arxiv.org/abs/astro-ph/0604501
dc.identifierAstrophys.J.648:430-434,2006
dc.identifierdoi:10.1086/505904
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182408
dc.subjectAstrophysics
dc.title3-D Photoionization Structure and Distances of Planetary Nebulae III. NGC 6781
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