Extreme-Ultraviolet Rocket Spectroscopy of the Hot DA White Dwarf G191-B2B

Details Extreme-Ultraviolet Rocket Spectroscopy of the Hot DA White Dwarf G191-B2B Extreme-Ultraviolet Rocket Spectroscopy of the Hot DA White Dwarf G191-B2B

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...562..992g&link_type=abstract

The Astrophysical Journal, Volume 562, Issue 2, pp. 992-997.

Astronomy and Astrophysics

Astronomy

1

Instrumentation: Spectrographs, Stars: Individual (G191-B2B), Ultraviolet: Stars, Stars: White Dwarfs

Scientific paper

Because of a lack of spectral resolution in existing spectroscopic data, current white dwarf atmospheric models cannot explain the atmospheric structure, and resultant extreme-ultraviolet (EUV) emission, of G191-B2B unambiguously. Therefore, a new rocket-borne EUV spectrograph was designed, built, calibrated, and launched. This instrument observed G191-B2B over a bandpass of 254-317 Å and with a resolving power of λ/Δλ~2800. Highly statistically significant absorption features within the flight spectrum, coupled with metal-rich modeled stellar spectra, provide evidence for blended features of Fe IV/Fe V and Fe IV/O III in G191-B2B's atmosphere. A 3 σ upper limit of 2×10-5 has been placed on the photospheric helium abundance, arguing against models that rely on He II as a major EUV opacity source.

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