Ionization structure of multiple-shell planetary nebulae
نویسندگان
چکیده
منابع مشابه
The temperature structure of dusty planetary nebulae
We have analyzed the effects of photoelectric heating by dust grains in photoionization models of planetary nebulae. We have shown that this process is particularly important if planetary nebulae contain a population of small grains. The presence of such grains would solve a number of problems that have found no satisfactory solution so far: i) the thermal energy deficit in some objects inferre...
متن کاملThe formation of asymmetries in Multiple Shell Planetary Nebulae due to interaction with the ISM
Multiple shell planetary nebulae (MSPNe) are most likely a consequence of the modulation of the mass-loss rate during the thermal pulses on the AGB. By using numerical simulations of their formation, the models’ predictions and the history of the winds can be investigated. As their halos have low densities and expansion velocities, MSPNe are expected to be affected by interaction with the ISM ....
متن کاملPlanetary Nebulae
Planetary nebulae (PNe) can be used to trace intermediate and old stellar populations in galaxies and the intracluster medium out to approximately 20 Mpc. PNe can be easily identified with narrow-band surveys, and their chemical abundances and radial velocities can be measured with multi-slit or multi-fiber spectrographs. We briefly review what has been accomplished to date, and include tables ...
متن کاملThe structure of Planetary Nebulae : theory vs . practice . ⋆
This paper the first of a short series dedicated to the long-standing astronomical problem of deprojecting the bi-dimensional apparent morphology of a three-dimensional mass of gas focuses on the density distribution in real Planetary Nebulae (and all types of expanding nebulae). We introduce some basic theoretical notions, discuss the observational methodology and develope the accurate procedu...
متن کاملAstronomy & Astrophysics The temperature structure of dusty planetary nebulae
We have analyzed the effects of photoelectric heating by dust grains in photoionization models of planetary nebulae. We have shown that this process is particularly important if planetary nebulae contain a population of small grains. The presence of such grains would solve a number of problems that have found no satisfactory solution so far: i) the thermal energy deficit in some objects inferre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201323205