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Is V899 Herculis an unsolved quadruple system containing double close binary stars?
Qian, S. -B.; Liao, W. -P.; He, J. -J. +2 more
Orbital period variation of the W UMa-type eclipsing binary, V899 Herculis, discovered by the Hipparcos satellite was investigated based on all available photoelectric and CCD times of light minimum. It is discovered that the orbital period of the binary shows a cyclic change with an amplitude of 0.0117 days. The cyclic period change can be explai…
Gamma-ray constraints on the infrared background excess
Salvaterra, R.; Ferrara, A.; Mapelli, M.
Motivated by the idea that the recently detected near-infrared (1.2-4 µm) excess over the contribution of known galaxies is due to redshifted light from the first cosmic stars [MNRAS 339 (2003) 973], we have used the effect caused by photon-photon absorption on gamma-ray spectra of blazars to put constraints on extragalactic background light…