Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101l...9m&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. L9-L12.
Astronomy and Astrophysics
Astrophysics
18
Binary Stars, Pulsars, Stellar Spectrophotometry, X Ray Sources, Color, Continuous Spectra, Energy Spectra, Stellar Atmospheres, Stellar Spectra, X Ray Spectra
Scientific paper
Fast photometry of the optical counterpart of the pulsating X-ray source H 2254-033 performed simultaneously in the five passbands of the Walraven system ranging from 3200 to 5500 A confirms the presence of the two reported optical periodicities at 805 and 859 sec and of a modulation with a 3.6-hour orbital period. The amplitudes of the two pulsations are comparable in the UV, whereas the 859-sec pulsation strongly dominates in the visual. Energy spectra show that the source of the 805-sec optical pulsation is beamed in the same direction as the X-rays and has a spectrum consistent with a Rayleigh-Jeans tail of a hot blackbody, whereas the orbital modulation and the 959-sec light source have spectra consistent with light produced by X-ray heating of the companion's stellar atmosphere; this confirms that X-ray heating is the source of the orbital modulation.
Motch Ch.
Pakull Manfred W.
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