GHRS observations of mass-loaded flows in Abell 78

Abstract

view Abstract Citations (20) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS GHRS Observations of Mass-loaded Flows in Abell 78 Harrington, J. Patrick ; Borkowski, Kazimierz J. ; Tsvetanov, Zlatan Abstract Spectroscopic observations of the central star of the planetary nebula Abell 78 were obtained with the Goddard High Resolution Spectrograph (GHRS) onboard the Hubble Space Telescope (HST) in the vicinity of the C IV lambda 1548.2, 1550.8 doublet. We find a series of narrow absorption features superposed on the broad, P Cygni stellar wind profile. These features are seen in both components of the doublet at heliocentric radial velocities of -18, -71, -131, and -192 km/s. At higher velocities, individual components are no longer distinct but, rather, merge into a continuous absorption extending to approximately -385 km/s. This is among the highest velocities ever detected for gas in a planetary nebula. The -18 km/s feature originates in an outer envelope of normal composition, while the -71 km/s feature is produced in the wind-swept shell encircling an irregular wind-blown bubble in the planetary nebula center. The hydrogen-poor ejecta of Abell 78, consisting of dense knots with wind-blown tails, are located in the bubble's interior, in the vicinity of the stellar wind termination shock. The high-velocity C IV lambda 154 absorption features can be explained as due to parcels of ejecta being accelerated to high velocities as they are swept up by the stellar wind during its interaction with dense condensations of H-poor ejecta. As the ablated material is accelerated, it will partially mix with the stellar wind, creating a mass-loaded flow. The abundance anomalies seen at the rim of the bubble attest to the transport of H-poor knot material by such a flow. Publication: The Astrophysical Journal Pub Date: January 1995 DOI: 10.1086/175169 Bibcode: 1995ApJ...439..264H Keywords: Absorption Spectra; Line Spectra; Mass Flow; Planetary Nebulae; Stellar Winds; Velocity Distribution; Hubble Space Telescope; Radial Velocity; Spectrum Analysis; Stellar Spectrophotometry; Astronomy; ISM: KINEMATICS AND DYNAMICS; ISM: PLANETARY NEBULAE: INDIVIDUAL NAME: ABELL 78; ULTRAVIOLET: ISM full text sources ADS | data products SIMBAD (3) MAST (1) ESA (1)