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Revista mexicana de astronomía y astrofísica
versão impressa ISSN 0185-1101
Rev. mex. astron. astrofis vol.47 no.1 Ciudad de México Abr. 2011
Mid and FarInfrared Photometry of Galactic Planetary Nebulae with the AKARI AllSky Survey
J. P. Phillips* and R. A. MárquezLugo**
Instituto de Astronomía y Meteorología, Av. Vallarta No. 2602, Col. Arcos Vallarta, C.P. 44130, Guadalajara, Jalisco, México (* jpp@astro.iam.udg.mx, ** alejmar@astro.iam.udg.mx).
Received 2010 December 14
Accepted 2011 January 28
RESUMEN
Presentamos fotometría en el medio y lejano infrarrojo de 857 nebulosas planetarias (NPs) galácticas utilizando datos provenientes del AKARI AllSky Survey. Se incluyen flujos a 9 y 18 µm obtenidos con la Infrared Camera (IRC), y a 65, 90, 140 y 160 µm producto de la farInfrared Surveyor (FIS). Se nota que la luminosidad IR de las NPs más jóvenes es comparable a la luminosidad total la estrella central y que posteriormente decrece hasta cuando D > 0.08 pc, lo cual es congruente con la evolución de la opacidad del polvo de las NPs y la apreciable absorción en las NPs jóvenes y en las proto NPs. Además notamos que hay poca evidencia de la evolución en los cocientes de los flujos IR/radio sugerida por autores previos. También hacemos notar que la disminución de la temperatura del polvo al aumentar el diámetro nebular es similar a la obtenida en estudios previos, mientras que los niveles de calentamiento por fotones de Lyα son <0.5 de la energía disponible para los granos. Parece haber una evolución del exceso infrarrojo (IRE) con la expansión de las nebulosas, el cual adquiere sus valores máximos cuando las NPs son más compactas.
ABSTRACT
We provide mid and farinfrared photometry of 857 Galactic planetary nebulae (PNe) using data derived from the AKARI AllSky Survey. These include fluxes at 9 and 18 µm obtained with the Infrared Camera (IRC), and at 65, 90, 140 and 160 µm using the farInfrared Surveyor (FIS). It is noted that the IR luminosities of the youngest PNe are comparable to the total luminosities of the central stars, and subsequently decline to where D > 0.08 pc. This is consistent with an evolution of PNe dust opacities, and appreciable absorption in young and protoPNe. We also note that there is little evidence for the evolution in IR/radio flux ratios suggested by previous authors. The falloff of dust temperatures with increasing nebular diameter is similar to that determined in previous studies, whilst levels of Lyα heating are <0.5 of the total energy budget of the grains. There appears to be an evolution in the infrared excess (IRE) as nebulae expand, with the largest values occurring in the most compact PNe.
Key Words: dust, extinction infrared: ISM ISM: jets and outflows planetary nebulae: general.
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