Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..199r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 199-212
Astronomy and Astrophysics
Astrophysics
69
Abundance, Carbon, Errors, Monte Carlo Method, Oxygen, Planetary Nebulae, Stellar Models, Astronomical Spectroscopy, Computerized Simulation, Line Spectra, Magellanic Clouds, Mathematical Models, Milky Way Galaxy
Scientific paper
We have reexamined the problem of the discrepancy between carbon abundances in planetary nebulae derived from the CII lambda(4267) and CIII) lambda(1909) line intensities. To this end, we have compiled the published optical and ultraviolet data allowing to compute C/O in planetary nebulae, and constructed diagrams providing a synthetic view of the problem. We have performed Monte-Carlo simulations to study the effect of observational errors in the measurement of line intensities, and have found that C/O abundance ratios derived from the CII lambda(4267) lines are strongly biased towards too large values, which explains a large part of the trend seen in the observational diagrams. Taking into account the observational errors, we discuss some other explanations which have been proposed to resolve the discrepancy, such as temperature fluctuations. Adopting the C/O values from the CIII) lambda(1909) lines, we find that carbon-rich objects represent less than one half of the total number of planetary nebulae. This is significantly less than the proportions quoted in previous studies. The percentage of carbon-rich objects among Type I and Non Type I Galactic planetary nebulae are similar, contrary to what is found in the Magellanic Clouds.
Rola C.
Stasinska Grazina
No associations
LandOfFree
The carbon abundance problem in planetary nebulae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The carbon abundance problem in planetary nebulae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The carbon abundance problem in planetary nebulae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1012806