Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..262b&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 262-265 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
1
Planetary Nebulae, Stars, Stellar Spectrophotometry, Iue, Red Shift, Stellar Atmospheres, Stellar Models
Scientific paper
High and low resolution IUE observations of the central star of the planetary nebula NGC 40 is determined. From consideration of the 220.0nm interstellar extinction feature, the reddening towards NGC 40 is determined to be E(B-V)=0.50. The continuum distribution is best fitted with a blackbody emission with temperature between 80,000 and 100,000K. Comparison with existing model atmospheres for WR stars is also discussed. The line spectrum is dominated by strong emission lines from different ionization stages of C. From the high resolution spectrum it was seen that almost all the emission line flux is of stellar origin, as all the lines are extremely broad. P Cygni profiles of the CIV and SiIV resonance lines and of HeII lambda 1640 indicate an expanding wind with a terminal velocity of V(infinity = 1800 K m/s.
Bianchi Luciana
Grewing Michael
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