Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..10...38a&link_type=abstract
The Seventh Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows (Eds. William H. Lee and Silvia Torres-Peimbert) Rev
Astronomy and Astrophysics
Astrophysics
1
Ism: Abundances, Planetary Nebulae: General
Scientific paper
Presented here is the analysis of four planetary nebulae which show well-resolved Doppler splitting of their emission lines into distinct spectral components. The red, (R), and blue, (B), components of the spectral lines have been separately analyzed to obtain the reddening, the electron temperature, the electron density, and the ionic and total abundances for each object within two areas of each nebula along the line of sight. The derived physical conditions for the R and B components were then compared to see if any variations occurred along the line of sight within these objects, indicating the presence of physical imhomogeneities along the line of sight. For the central spectrum of NGC 6309, a variation of 1600K in T[e][O III] is found, along with suggested variations in n[e][O II], c(H β ) and N/H between the R and B components. For the central position of NGC 6751, T[e][O III] varies by 1500K between the R and B components. However, despite taking these T[e] variations found for NGC 6309 and NGC 6751 into account when calculating O2 +/H+ ratios, discrepancies still exist between ratios derived from the recombination vs. the collisional lines. It is finally noted that the expansion velocities for both the collisional and recombination lines of O2 + are the same, indicating that the same volume of emission is traced by these lines.
Armour Mary-Helen
Kingsburgh Robin L.
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