NLTE analysis of high-resolution spectra of CSPN

Details NLTE analysis of high-resolution spectra of CSPN NLTE analysis of high-resolution spectra of CSPN

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.169..183h&link_type=abstract

(IAU, European Regional Astronomy Meeting on New Windows to the Universe, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics a

Astronomy and Astrophysics

Astrophysics

11

Nonequilibrium Thermodynamics, Planetary Nebulae, Stellar Evolution, Stellar Spectra, Stellar Atmospheres, Stellar Luminosity, Stellar Winds, Thermodynamic Equilibrium

Scientific paper

Preliminary results of new high-resolution and S/N ratio spectra of central stars of planetary nebulae (CSPN) are presented. The atmospheric parameters (Teff, log g, helium abundance) are derived using NLTE techniques. The results obtained confirm the conclusions of Mendez et al. (1988): (1) the distance scale of CSPN is greater than usually assumed; (2) as a consequence the luminosities of the CSPN agree with the predictions of evolutionary tracks, and (3) for a given temperature, the CSPN with strong winds are more massive than the others.

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