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Ultraviolet, optical, and radio observations of the transient X-ray source GRO J0422+32

Authors: C. R. Shrader; R. R. Wagner; S. G. Starrfield; R. M. Hjellming; X. H. Han;

Ultraviolet, optical, and radio observations of the transient X-ray source GRO J0422+32

Abstract

We have monitored the early evolution of the transient X‐ray source GRO J0422+32 from approximately 2 weeks post‐discovery and into its early decline phase at ultraviolet, optical and radio wavelengths. Optical and ultraviolet spectra, obtained with the Perkins 1.8‐m telescope and with IUE respectively, exhibit numerous, but relatively weak, high‐excitation emission lines such as those arising from He ii, N iii, N v, and C iv superposed on a very blue continuum. We find that the ultraviolet and optical characteristics of GRO J0422+32 as well as its radio evolution, are similar to other recent well‐observed X‐ray novae or soft X‐ray transients such as Cen X‐4, V616 Mon, and Nova Muscae 1991, which suggests that GRO J0422+32 is also a member of that subclass of low mass X‐ray binaries (LMXBs). Further observations as GRO J0422+32 declines into quiescence will be required to determine whether the compact object is a neutron star or a black hole.

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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!
1
Average
Average
Average
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