A preliminary report on simultaneous ultraviolet and optical observations of Lambda Eridani

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Light Curve, Radial Velocity, Stellar Spectrophotometry, Ultraviolet Astronomy, Variable Stars, H Alpha Line, Power Spectra, Stellar Spectra

Scientific paper

Radial velocity observations of Lambda Eridani between 1971 and 1980 and uvbyH-alpha photometry in 1977 show that the star is both a light and velocity variable with a period of 0.701538 d. Copernicus observations in 1977 are compatible with this result. Both the radial velocity and photometric amplitude are variable, and these variations may be correlated with the hydrogen emission line strength. The character and phasing of the light and velocity curves suggest that Lambda Eridani is a pulsating variable.

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