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HST FOS Observations of KPD0005+5106: A Subluminous WN-WC Descendant by Ongoing Mass Outflow?

Published online by Cambridge University Press:  07 August 2017

Edward M. Sion
Affiliation:
Dept. of Astron. & Astrophys., Villanova University, Villanova, PA 19085, USA
Ronald A. Downes
Affiliation:
STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA

Abstract

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We report the results of spectroscopic observations of the ultra-high excitation, helium-rich, pre-white dwarf KPD0005+5106 obtained with the Hubble Space Telescope Faint Object Spectrograph (FOS) in 1991 May and July with the red (FOS/RD) and blue (FOS/BL) Digicon detectors. The data reveal a rich line spectrum both in absorption and in emission with ultra-high excitation species present including O VIII, N V, possibly C V, Fe VI, Fe VII and numerous weaker high n, low l, transitions of C IV and O VI as well as the predominant He II (3 → n) and He II (Balmer α) absorption lines. There is a strong emission complex at 2981A which we identify primarily as three transitions of N V commonly seen in WN Wolf-Rayet spectra. We present evidence that high ionization species in emission (O VIII, N V, C IV, Si IV) and in absorption (He II, Fe VI, Fe VII) are longward-shifted relative to the far UV resonance (circumstellar) absorption lines by 25–50 km/s. Based upon the detected species, line velocities, line widths and emission features, we conclude that (1) KPD0005 is the very likely the evolutionary descendant of a WN-WC subluminous Wolf-Rayet progenitor and (2) has ongoing, possibly episodic, mass outflow.

Type
V. Planetary Nebulae Connection: Evolution to White Dwarfs
Copyright
Copyright © Kluwer 1993 

References

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