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- W2140220721 abstract "Optical and UV spectrophotometric data of the neb- ulaandthecentralstaroftheplanetarynebulaESO 166 PN 21 are presented. The analysis of the nebular lines conrms that it is a He- and N-rich PN, with He/H = 0:138 0:005 and N/O =0 :58 0:08. The oxygen abundance is 12 + log O/H =8 :60 0:10. A distance of 1:2 0:2 kpc is derived for the nebula. The central star is very faint and blue, with an apparent magnitudeV =1 7 :940:03 mag and a dereddened color index (B V )0 = 0.38mag.ItshowsfaintwideHandHeabsorption lines typical of a DAO star. By modeling the line proles we derived Teff = 69200 8700 K, log g=7 :14 0:39 and log He/H= 1:500:49forthestar.ThepositionofthestarinaHR diagram compared with evolutionary tracks indicates a stellar massof0.55M.Thebolometriccorrectionderivedfromthe modelatmosphereis 5.6magwhich,combinedwiththemass, yields an absolute visual magnitude MV = 6.95, a luminosity of 22 L and a distance of 1185700 pc, in good agreement with the nebular distance. Therefore, ESO 166 PN 21 central star is among the hottest and most helium-rich DAO stars and it is one of the most evolved PN nuclei known, similar to the central stars of S216 and NGC7293. A kinematical age of 16100 yr is deduced for the nebula which is lower by about two orders of magnitude than the age of the central star. The possibility that this object is a member of a close binary system is suggested." @default.
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- W2140220721 date "1997-02-01" @default.
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- W2140220721 title "The evolved central star of the planetary nebula ESO 166-PN 21." @default.
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