A discussion on new VBLUW observations of the X-ray binary Sk. 160=SMC X-1

• VBLUW photometry (Walraven system) of Sk. 160=SMC X-1 made in 1973, 1975, and 1977 are discussed. They are compared with those of van Paradijs (1977) made in 1976. Using all available photometric and X-ray mid-eclipse data, a period is determined by a weighted least-squares solution: P=3.89235 dplusmn0.00002 d m.e

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

Experimental/ eclipsing binary stars

stellar motion

stellar photometry

X-ray binary stars/ X-ray binary

SMC X-1

VBLUW photometry

period

Sanduleak 160

Sk 160

variable star

eclipsing binary

X-ray source

AD 1973 07 03 to 1977 12 18/ A9580J Photographic region astronomical observations A9710R Stellar radiation and spectra A9710W Stellar space motions (proper motions

radial velocities

and orbits) A9780H Eclipsing binaries A9780J X-ray binaries

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