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Revista mexicana de astronomía y astrofísica
versão impressa ISSN 0185-1101
Rev. mex. astron. astrofis vol.49 no.2 Ciudad de México Jan. 2013
Articles
The latest eruption of planetary nebula IC 21651
J. Bohigas,2 M. Rodríguez,3 and R. J. Dufour4
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, 22860 Ensenada, B. C., México. (jbb@astrosen.unam.mx).
3 Instituto Nacional de Astrofísica, Óptica y Electrónica, 72000 Puebla, Pue., México. (mrodri@inaoep.mx).
4 Physics and Astronomy Department, Rice University, 6100 Main MS-61, Houston, Texas 77005-1827, USA. (rjd@rice.edu).
Received 2013 January 17.
Accepted 2013 April 15.
RESUMEN
Espectroscopía de alta dispersión con rendija abierta de la región interna de la nebulosa planetaria (NP) IC 2165, revela que su temperatura es elevada y relativamente uniforme, mientras que la densidad es mucho mayor cerca del núcleo de la NP. Las abundancias indican que no es una NP de tipo I. Una gran cantidad de calcio y hierro está atrapada en granos. La masa ionizada es al menos ~0.05 M☉. Un modelo de fotoionización (Cloudy, version 10.00) que supone una ley del cuadrado inverso para la densidad y abundancias típicas de NP que no son de tipo I, reproduce razonablemente bien el espectro y los cocientes de líneas sensibles a densidad y temperatura, pero no las propiedades globales de la NP. Todo indica que IC 2165 fue producida por una estrella A5 V de 2 M☉ y pobre en metales, que arrancó hace unos 2 x 109 años.
ABSTRACT
Open slit high dispersion spectroscopic observations of the inner region of planetary nebula (PN) IC 2165 indicate that the object has a relatively uniform and high electron temperature, with its density being much larger close to the PN nucleus. Abundances imply that it is a non-type I PN. Calcium and iron have been heavily depleted into grains. The ionized mass is at least ~0.05 M☉. A photoionization model (Cloudy, version 10.00) assuming an inverse square law for the density and abundances typical of a non-type I PN, produced a fair replica of the spectrum and of all electron density and temperature sensitive line ratios, but not of the global properties of this object. All evidence indicates that IC 2165 was produced by a metal poor 2 M☉ A5 V star that took off some 2 x 109 yr ago.
Key Words: planetary nebulae: general ISM: abundances ISM: individual (IC 2165).
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1 Based on observations collected at the Observatorio Astronómico Nacional in San Pedro Mártir, B. C, Mexico.