Discovery of highly ionized species in the ultraviolet spectrum of Feige 24

Journal Article · Wed Dec 15 04:00:00 EST 1982 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183925· OSTI ID:5577750

Dupree, A K; Raymond, J C

aaaigh-resolution ultraviolet spectrum of the nearby (90 pc) white dwarf binary Feige 24 (DA+MI-2V) obtained with the Explorer satellite (IUE) reveals two sets of absorption features in the species C iv, Si iv, and N v. The low-velocity component (Vapprox.1 km s/sup -1/) arises from the local interstellar gas apparently ionized by the white dwarf. The second component, at high velocities (Vapprox.+83 km s/sup -1/), arises in the atmosphere of the white dwarf in the Feige 24 system. The presence of this large velocity shift supplies the first strong evidence for narrow absorption cores due to high-temperature species in a white dwarf atmosphere. Observations around the orbital period will provide a direct measurement of the gravitational redshift and the mass of the white dwarf. The inferred hydrogen density is 0.008 cm/sup -3/ toward this source.

• Research Organization: Harvard-Smithsonian Center for Astrophysics
• OSTI ID: 5577750
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 263:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ATMOSPHERES
BINARY STARS
CARBON IONS
CHARGED PARTICLES
DWARF STARS
INTERSTELLAR GRAINS
IONIZATION
IONS
NITROGEN IONS
PARTICLES
SILICON IONS
SPECTRA
STARS
STELLAR ATMOSPHERES
ULTRAVIOLET SPECTRA
WHITE DWARF STARS