Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..101v&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 1, Aug. 1981, p. 101-104.
Astronomy and Astrophysics
Astrophysics
6
Binary Stars, Least Squares Method, Light Curve, Stellar Spectrophotometry, Variable Stars, X Ray Sources, Color, Interstellar Extinction, Spectrum Analysis, Ubv Spectra
Scientific paper
Photometric observations in the VBLUW bands of the Walraven system of the X-ray binary Sk. 160 (SMC X-1) are discussed. The observations were made by a simultaneous photometer from August to December, 1977, and compared with similar observations made in 1973 and 1975 and those of van Paradijs (1977) made in 1976. A weighted least-squares solution based on all available photometric and eclipse data is used to determine a period of 3.89235 + or - 0.00002 days for the system. Light curves in the white light l band, representing the sum of the areas between the V, B, U and W passbands, are presented along with those in V and B. Examination of the color indices reveals the presence of systematic errors in the VBLUW data, and, when corrected for, indicate an interstellar reddening of 0.11 + or - 0.014 magnitudes.
van Genderen Arnout M.
van Groningen Ernst
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