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NLTE analysis of Keck HIRES spectra of K648: Central star of the Planetary Nebula Ps1 in M15

Published online by Cambridge University Press:  25 May 2016

James K. McCarthy ,
Roberto H. Méndez ,
Sylvia Becker ,
Keith Butler  and
Rolf-Peter Kudritzki
James K. McCarthy
Affiliation:
1Dept. of Astronomy, California Institute of Technology
Roberto H. Méndez
Affiliation:
2Universitäts-Sternwarte München
Sylvia Becker
Affiliation:
2Universitäts-Sternwarte München
Keith Butler
Affiliation:
2Universitäts-Sternwarte München
Rolf-Peter Kudritzki
Affiliation:
2Universitäts-Sternwarte München 3Max Planck Institut für Astrophysik, Garching bei München

Extract

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Küstner (1921) catalogued K648 in his photographic survey of M15, but it was not recognized as a PN central star until Pease (1928) discovered the nebula, denoted Ps1. As one of very few PN known in globular clusters — it was the only known until Gillet et al. (1989) reported the discovery of a second in M22 and Jacoby et al. (this meeting) announced two new but very faint objects — K648 offers one of the better opportunities to study the post-AGB evolution of extreme Pop. II stars. Previous investigations of the nebula and star (Adams et al. 1984; Peña, Torres-Peimbert, & Ruiz 1992; Heber, Dreizler, & Werner 1993) all concluded that the stellar temperature is slightly less than 40000 K. Heber et al. also concluded the photospheric He and C abundances were 3 × and 5 × higher than solar.

Type
III. Central Stars
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 122
Copyright
Copyright © Kluwer 1997 

References

Adams, S. et al. 1984, MNRAS, 207, 471.Google Scholar
Durrell, P.R., & Harris, W.E. 1993, Astron. J., 105, 1420.Google Scholar
Heber, U., Dreizler, S., & Werner, K. 1993, Acta Astronomica, 43, 337.Google Scholar
Küstner, W. 1921, Veröff. Univ. Sternwarte Bonn, 15.Google Scholar
Pease, F.G. 1928, PASP, 40, 342.CrossRefGoogle Scholar
Peña, M., Torres-Peimbert, S., & Ruiz, M.T. 1992, Astron. Astrophys., 265, 757.Google Scholar