Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99l..15k&link_type=abstract
Astronomy and Astrophysics, vol. 99, no. 2, June 1981, p. L15-L17.
Astronomy and Astrophysics
Astrophysics
8
Absorption Spectra, Line Spectra, Planetary Nebulae, Stellar Atmospheres, Stellar Spectra, Visible Spectrum, Atmospheric Models, Emission Spectra, H Lines, Helium Hydrogen Atmospheres, Photosphere
Scientific paper
Normal photospheric hydrogen and helium absorption lines were detected in the visual spectrum of the 'continuous' central star of the planetary nebula NGC 3242. The star was observed with an Image Dissector Scanner (IDS) and the Boller and Chivens spectrograph at the Cassegrain focus of the ESO 3.6-m telescope. A dispersion of 29 A/mm in the 2nd order was achieved. A non-LTE analysis of the hydrogen and helium absorption lines demonstrates an effective temperature between 50,000 K and 100,000 K, at a gravity between log g equals 4.0 and 5.0 and a normal helium abundance, i.e., y equals 0.09.
Kudritzki Rolf Peter
Mendez Roberto H.
Simon K. P.
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