Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983acaps...3...16c&link_type=abstract
(Acta Astrophysica Sinica, vol. 3, no. 1, 1983, p. 16-25) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, June 1983
Astronomy and Astrophysics
Astrophysics
B Stars, Eclipsing Binary Stars, Stellar Spectra, Stellar Spectrophotometry, Supergiant Stars, X Ray Sources, Electrophotometry, Power Spectra, Spectrum Analysis
Scientific paper
The X-ray pulsar Vela X-1 (= 4U 0900-40) is a component of an X-ray binary whose primary is a typical early B type supergiant. Its X-ray pulse period is about 283 s. Observations with the Hakucho satellite in March 1980 indicated a significant increase in the X-ray pulse period. The authors report photoelectric narrow-band photometry obtained in February 1980 and spectroscopic observations from April 15, 1980. Their results show no significant variations that may be correlated with the sudden change of the X-ray pulse period.
Bian Yu-Lin
Chen Jian-Sheng
Tang Xiao-Ying
Zou Zhen-Long
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