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Optical Line profile variability of the B1+neutron star binary system LS I+65 010 = 2S 0114+650
Gloria Koenigsberger, Gabriela Canalizo, Anabel Arrieta +2
We present high resolution spectroscopic observations of the massive X-ray binary system LS I+65 010=2S 0114+650 in the optical wavelength region. A correlation between equivalent…
Is HCG31 undergoing a merger or a fly-by interaction?
M. G. Richer, L. Georgiev, M. Rosado +3
We present Fabry-Perot and multi-object spectroscopy of the galaxies in Hickson compact group 31 (HCG31). Based upon our H data cubes, galaxies A and C are a single entity, show…
The alpha-element abundances in the most oxygen-poor planetary nebula PN G 135.9+55.9
M. G. Richer, G. H. Tovmassian, G. Stasinska +5
We present extensive new spectroscopy and imaging of PN G 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find t…