IUE OBSERVATIONS OF THE ULTRAVIOLET SPECTRUM OF THE CLOSE BINARY δ PICTORIS

The eclipsing binary δ Pic has been observed with the International Ultraviolet Explorer (IUE) satellite. Two highresolution spectrograms in the far-ultraviolet (λλ À 150— 1900) and one high-resolution spectrogram in the mid-ultraviolet of (λλ1900-3200) were obtained. The far-ultraviolet resonance l...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1980-10, Vol.92 (549), p.688-690
Main Authors: KONDO, YOJI, McCLUSKEY, GEORGE E., FEIBELMAN, WALTER A.
Format: Article
Language:English
Subjects:
Line spectra
Mass flow
Observational astronomy
Radial velocity
Resonance lines
Solar observatories
Space based observatories
Terminal velocity
Ultraviolet observatories
Ultraviolet spectrum
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Summary:The eclipsing binary δ Pic has been observed with the International Ultraviolet Explorer (IUE) satellite. Two highresolution spectrograms in the far-ultraviolet (λλ À 150— 1900) and one high-resolution spectrogram in the mid-ultraviolet of (λλ1900-3200) were obtained. The far-ultraviolet resonance lines of Cm (λ1175) and SiIV (λλ1393 and 1402) show the presence of excess absorption due to gas leaving the primary star with velocities as high as 600-700 km s⁻¹ . Many of the interstellar lines are doubled with the two components having mean velocities of — 40.6 and +9.0 km s⁻¹. It is suggested that the negative velocity component may be due to an expanding circumstellar shell surrounding the binary system.
ISSN:0004-6280
1538-3873
DOI:10.1086/130730