Mass-loss rates and C/He ratios in the winds of the WC central stars of planetary nebulae

Details Mass-loss rates and C/He ratios in the winds of the WC central stars of planetary nebulae Mass-loss rates and C/He ratios in the winds of the WC central stars of planetary nebulae

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..401d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 2, p. 401-407.

Astronomy and Astrophysics

Astronomy

10

Carbon, Carbon Stars, Helium, Planetary Nebulae, Stellar Mass Ejection, Stellar Winds, Wolf-Rayet Stars, Abundance, Asymptotic Giant Branch Stars, Local Thermodynamic Equilibrium

Scientific paper

We estimate the C/He ratio in the central star winds of five planetary nebulae that have WC spectra: SwSt-l, He2-99, He2-113, BD + 30 deg 3639 and NGC 5315. These estimates take into account optical depth effects in the wind. Our results indicate that C/He is 0.41-0.68 by number, suggesting exposure of He-burned material. If helium and carbon are the dominant elements in the winds of those stars, the mass-loss rates are in the range 5.7 x 10 exp -7 to 6.7 x 10 exp -6 solar masses/yr, substantially higher than previous estimates.

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