Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406..165b&link_type=abstract
Astronomy and Astrophysics, v.406, p.165-174 (2003)
Astronomy and Astrophysics
Astrophysics
21
Ism: Abundances, Planetary Nebulae: Individual: Bd+30 3639, Ngc 6543, Infrared: Ism, Ism: Lines And Bands
Scientific paper
Infrared spectra taken with the Short Wavelength Spectrometer on board ISO and UV observations with IUE of planetary nebulae BD+30 3639 and NGC 6543 are presented. The extinction derived using infrared lines for BD+30 3639 is EB-V= 0.34, slightly higher than previous determinations. For NGC 6543 the extinction found from the hydrogen lines is EB-V= 0.07. Infrared, optical and ultraviolet data have been used to derive the physical parameters of the nebula. BD+30 3639 has an average Te= 8500 K and Ne= 11 000 CH_betam3. In the case of NGC 6543 a Te = 8200 K and Ne = 5000 CH_betam3 have been found, in agreement with previous determinations. The element abundances have been derived and compared to those found in the Sun and O, B stars. This comparison gives a hint of the mass of the progenitor stars from which they evolved.
Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) and with the participation of ISAS and NASA.
Bernard-Salas Jeronimo
Feibelman Walter A.
Pottasch Stuart R.
Wesselius R.. P.
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