Pulsations in the Ultraviolet and X-Ray Spectra of VELA X-1

Details Pulsations in the Ultraviolet and X-Ray Spectra of VELA X-1 Pulsations in the Ultraviolet and X-Ray Spectra of VELA X-1

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..940b&link_type=abstract

Astrophysical Journal v.465, p.940

Astronomy and Astrophysics

Astronomy

9

Stars: Individual Constellation Name: Vela X-1, Stars: Oscillations, X-Rays: Stars

Scientific paper

In simultaneous observations with the Faint Object Spectrograph aboard the Hubble Space Telescope and the large-area counters aboard Ginga, we obtained time-resolved ultraviolet and X-ray spectra of the X-ray binary HD 77581/4U 0900-40 (Vela X-1) during inferior conjunction of the X-ray source. We detected pulsations at the 283.33 s X-ray pulse period in the absorption lines Si IV λ1402 and N V λλ1238, 1242. The pulse amplitudes in the UV lines were ˜3%. The profile of the pulsed UV intensity in the Si IV absorption line resembled that of the soft X-rays, while that in the N V line was anticorrelated with the profile of the hard X-ray pulsations. The effect is probably due to photoionization of Si IV and N IV in the stellar wind of HD 77581 by the rotating beam of Vela X-1.

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