Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349...93l&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 93-102 (SEE N85-20961 11
Astronomy and Astrophysics
Astronomy
4
Binary Stars, Iue, Spectrum Analysis, Ultraviolet Astronomy, Variable Stars, White Dwarf Stars, Abundance, Carbon, Hydrogen, Nitrogen, Stellar Atmospheres, Stellar Winds, Temperature Measurement, Trace Elements
Scientific paper
Numerous discoveries with the IUE Observatory have stimulated research on most spectroscopic types of degenerate dwarf stars. The hottest helium-rich cases apparently have substantial abundances of certain ions heavier than helium, due most likely to selective radiative acceleration. Hydrogen DA stars show trace abundances at temperatures as low as 20,000 K and provide evidence for modest outflowing winds. Cooler DA stars exhibit mysterious broad features near 1400A and 1600A. The element carbon is almost omnipresent in cool helium-rich stars, unless metallic features are seen instead. The carbon is most likely dredged-up by a deep convective envelope. The metals are attributed to interstellar accretion. IUE has played an important role in temperature determinations for helium-rich and magnetic stars. White dwarf components in detached and cataclysmic binaries have been studied extensively with IUE, often for the first time. Among the potential results are mass determinations and information on the photospheric temperature distributions for accreting primaries.
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