Abstract
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, Dreizier, & 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.
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References
Adams, S. et al. 1984, MNRAS, 207, 471
Durrell, PR., & Harris, W.E. 1993, Astron. J., 105, 1420
Heber, U., Dreizler, S., & Werner, K. 1993, Acta Astronomica, 43, 337
Küstner, W. 1921, Veröff. Univ. Sternwarte Bonn, 15
Pease, F.G. 1928, PASP, 40, 342
Peña, M., Torres-Peimbert, S., & Ruiz, M.T. 1992, Astron. Astrophys., 265, 757
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McCarthy, J.K., Méndez, R.H., Becker, S., Butler, K., Kudritzki, RP. (1997). NLTE Analysis of Keck HIRES Spectra of K648: Central Star of the Planetary Nebula Ps1 in M15. In: Habing, H.J., Lamers, H.J.G.L.M. (eds) Planetary Nebulae. International Astronimical Union / Union Astronomique Internationale, vol 180. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5244-0_43
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DOI: https://doi.org/10.1007/978-94-011-5244-0_43
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