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The Astrophysical Journal
Article . 1998 . Peer-reviewed
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Ultraviolet and Optical Spectroscopy of AL Comae 1 Year after Superoutburst

Authors: Paula Szkody; D. W. Hoard; Edward M. Sion; Steve B. Howell; F. H. Cheng; Warren M. Sparks;

Ultraviolet and Optical Spectroscopy of AL Comae 1 Year after Superoutburst

Abstract

We present {ital Hubble} {ital Space} {ital Telescope} ({ital HST}) ultraviolet spectra of AL Com obtained with the Faint Object Spectrograph (FOS) during four epochs 10{endash}14 months following its 1995 April superoutburst. During our 1996 observations, the continuum fluxes underwent a slow decline of 20{percent}, while the spectrum showed Ly{alpha} and Si ii absorption features indicative of a 20,000 K white dwarf. The cooling sequence in AL Com is found to be about half as long as that of WZ Sge. This timescale is what is predicted for an outburst that was half the duration of WZ Sge, if shear mixing and angular momentum result in nonspherical accretion into an equatorial belt. Our longest data set (1996 June) showed spectral line variations on the orbital period with C iv in emission for about one-third of the orbit but revealed no orbital variability in the continuum. Ground-based optical spectra obtained close in time to our February {ital HST} data also show stronger line emission for one-third of an orbit and highly variable broad absorption from the secondary star. The spectral variations may be due to the changing visibility of a nonuniform disk or of a secondary star irradiated by the hotmore » white dwarf. {copyright} {ital {copyright} 1998.} {ital The American Astronomical Society}« less

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
19
Average
Top 10%
Top 10%
gold