Bibcode
DOI
Corradi, Romano L. M.; Munari, Ulisse; Livio, Mario; Mampaso, Antonio; Gonçalves, Denise R.; Schwarz, Hugo E.
Referencia bibliográfica
The Astrophysical Journal, Volume 560, Issue 2, pp. 912-918.
Fecha de publicación:
10
2001
Revista
Número de citas
30
Número de citas referidas
26
Descripción
Hubble Space Telescope (HST) and ground-based [O II] and [N II] images
obtained in the period 1996-1999 reveal a complex, ionized optical
nebula around the symbiotic binary CH Cyg extending out to 18" or 5000
AU from the central stars. The observed velocity range of the nebula,
derived from long-slit echelle spectra, is 130 km s-1. In
spite of its complex appearance, the velocity data show that the basic
morphology of the inner regions of the optical nebula is that of a
bipolar outflow extending nearly along the plane of the sky out to some
2000 AU from the center. Even if the extension of this bipolar outflow
and its position angle are consistent with those of the radio jet
produced in 1984 (extrapolated to the time of our optical imagery), no
obvious optical counterpart is visible to the original, dense radio
bullets ejected by the system. We speculate that the optical bipolar
outflow might be the remnant of the interaction of the bullets with a
relatively dense circumstellar medium. Based on observations obtained at
the 4.2 m William Herschel Telescope and 2.6 m Nordic Optical Telescope
operated on the island of La Palma by the Isaac Newton Group and the
Nordic Optical Telescope Scientific Association (NOTSA), respectively,
at the Spanish Observatorio del Roque de Los Muchachos of the Instituto
de Astrofísica de Canarias, and with the NASA/ESA Hubble Space
Telescope, obtained at the Space Telescope Science Institute, which is
operated by the Association of Universities for Research in Astronomy,
Inc., under NASA contract NAS 5-26555.