Pulsations in the UV and X-ray Spectra of VELA X-1

Details Pulsations in the UV and X-ray Spectra of VELA X-1 Pulsations in the UV and X-ray Spectra of VELA X-1

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2005b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #20.05; Bulletin of the American Astronomical Society, Vol. 24, p.1153

Astronomy and Astrophysics

Astronomy

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 HD77581/4U0900-40 (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 SiIVlambda 1402 and NVlambda lambda 1238,1242. The pulse amplitudes in the UV lines were ~ 3%. The profile of the pulsed UV intensity in the SiIV absorption line resembled that of the soft X-rays, while that in the NV line was anticorrelated with the profile of the hard X-ray pulsations. The effect is probably due to photoionization of SiIV and NIV in the stellar wind of HD77581 by the rotating beam of Vela X-1.

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