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IUE Observations of Central Stars

Published online by Cambridge University Press:  18 September 2017

Sara R. Heap
Sara R. Heap*
Affiliation:
Goddard Space Flight Center, NASA, Greenbelt, Md. U.S.A.

Extract

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Despite similar evolutionary histories and a common ultimate fate as white dwarfs, central stars of planetary nebulae have surprisingly diverse spectral properties. Their visual spectral types encompass all varieties known for hot stars, including Wolf-Rayet, O and Of, subdwarf O, white-dwarf, and continuous (Aller 1968, 1976), and O VI-emission types (Smith and Aller 1969, Heap 1982). Their spectroscopic temperatures range from less than 30,000°K (e.g. He 2-138, Mendez and Niemela 1979; the WC 11 stars, Houziaux and Heck 1982) to upwards to 150,000°K or more (e.g. NGC 246, Heap 1975; Abell 30, Greenstein 1981). Their atmospheres range from demonstrably helium- and carbon-rich (e.g. the WR stars, Barlow and Hummer 1982, Benvenutı et al. 1982) to apparently normal (e.g. the Of stars, Heap 1977a,b), to helium-poor (e.g. the nascent white dwarfs in Abell 7 and NGC 7293, where gravitational settling appears to have already taken effect, Mendez et al. 1981).

Type
Section V: Central Stars of Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 103: Planetary Nebulae , 1983 , pp. 375 - 390
Copyright
Copyright © Reidel 1983 

References

Abbott, D.C. and Hummer, D.G.: 1982, this volume.Google Scholar
Aller, L.H.: 1968, “Planetary Nebulae”: IAU Symposium No. 34, p. 339.Google Scholar
Aller, L. H.: 1976, Mem. de la Soc. Roy. des Sci. de Liege, 6eme Ser., p 271.Google Scholar
Barlow, M. J. and Hummer, D.: 1982, “Wolf-Rayet Stars”: IAU Symp. No. 99. de Loore, C., ed. (D. Reidel: Dordrecht).Google Scholar
Benvenutı, P, Perinotto, M. and Willis, A.J.: 1982, “Wolf=Rayet Stars”, de Loore, C., ed., (D. Reidel: Dordrecht.)Google Scholar
Cudworth, K.: 1974, Astron. J. 79, 1384.Google Scholar
Greenstein, J. L.: 1981, Astrophs. J. 245, 124.Google Scholar
Heap, S. R.: 1975, Astrophys. J. 196, 195.Google Scholar
Heap, S.R.: 1977, Astrophys. J. 215, 609, 864.Google Scholar
Heap, S.R.: 1982, “Wolf-Rayet Stars”, de Loore, C., Ed., (D. Reidel: Dordrecht).Google Scholar
Hummer, D.: 1982, Astrophys. J. 257, 724.Google Scholar
Houziaux, L. and Heck, A.: 1982, “Wolf-Rayet Stars”, de Loore, C., Ed., (D. Reidel: Dordrecht).Google Scholar
Kaler, J.: 1981, Astrophys. J. 250, L31.Google Scholar
Kohoutek, M. and Martin, W.: 1981, Astron. Astrophys. 94, 365.Google Scholar
Maran, S.P., Stecher, T.P., Gull, T.R., Aller, L.H., Savedoff, M.: 1982, “Advances in UV Astronomy: Four Years of IUE Research”, Kondo, Y., Ed., NASA Google Scholar
Mendez, R. and Niemela, V.: 1979, Astrophs. J. 232, 496.Google Scholar
Mendez, R., Kudritzki, R.B., Gruschinske, J., Simon, K.P.: 1981, Astron. Astrophys. 101, 323.Google Scholar
Paczynski, B.: 1970, Acta Astron. 21, 417.Google Scholar
Pottasch, S.: 1981, Astron. Astrophys. 94, L13.Google Scholar
Schönberner, D.: 1979, Astron. Astrophys. 79, 108.Google Scholar
Schönberner, D.: 1981, Astron. Astrophys. 103, 119.Google Scholar
Smith, L.F. and Aller, L.H.: 1969, Astrophys. J. 157, 1245.Google Scholar
Weidemann, V.: 1981, “Effects of Mass-Loss on Stellar Evolution”, Chiosi, C., Stalio, R., Eds., (D. Reidel: Dordrecht).Google Scholar