Journal article

Evolutionary versus dynamical time scales for the evolution of the central stars of planetary nebulae

JK Mccarthy, JR Mould, RH Mendez, RP Kudritzki, D Husfeld, A Herrero, HG Groth

Astrophysical Journal | Published : 1990

Abstract

Investigated in this work is the disagreement between evolutionary and dynamical time scales for the evolution of the central stars of planetary nebulae (CSPNs) through the H-R diagram, using the results of high-resolution spectroscopic studies of CSPNs underway at the European Southern Observatory and at Palomar Observatory. These two studies combined have placed 23 CSPN in the distance-independent log g - log Teff diagram by comparing their photospheric absorption-line profiles observed at high signal-to-noise ratios with non-LTE (NLTE) model atmosphere line profiles. Results from the new Palomar 1.5 m echelle spectrograph confirm earlier published results from the ESO 3.6 m CASPEC echelle..

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