Detection of a Giant Halo Around NGC 7027

Navarro, S. G.; Mampaso, A.; Corradi, R. L. M.
Bibliographical reference

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City, November 21-24, 2000 (Eds. W. J. Henney, J. Franco, M. Martos, & M. Peña) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 12, pp. 171-171 (2002) (http://www.astroscu.unam.mx/~rmaa/)

Advertised on:
2
2002
Number of authors
3
IAC number of authors
0
Citations
1
Refereed citations
0
Description
As a parallel result of an IT Project aimed at determining accurate distances to more than 30 planetary nebulae using the extinction-distance method, we report here the serendipitous discovery of a giant halo around NGC 7027. We obtained the spectra of more than 60 field stars around each PN with the LDSS multi-slit spectrograph at the 4.2-m William Herschel Telescope (La Palma). In the spectra of the field around NGC 7027 we detected nebular lines of H I and [O III]. The variation of I(5007)/I(4861) with distance to the central star indicates that the emission originates in the object, implying that the ionized halo around NGC 7027 extends beyond 1 pc.