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A Warp in Progress: H I and Radio Continuum Observations of the Spiral NGC 3145
Brinks, Elias; Struck, Curtis; Elmegreen, Bruce G. +2 more
VLA H i observations and λ6 cm radio continuum observations are presented of the barred-spiral galaxy NGC 3145. In optical images NGC 3145 has stellar arms that appear to cross, forming “X”-features. Our radio continuum observations rule out shock fronts at three of the four “X”-features, and our H i data provide evidence of gas motions perpendicu…
On the Hipparcos Accuracy Using Binary Stars as a Calibration Tool
Docobo, J. A.; Andrade, M.
Stellar binary systems, specifically those that present the most accurate available orbital elements, are a reliable tool to test the accuracy of astrometric observations. We selected all 35 binaries with these characteristics. Our objective is to provide standard uncertainties for the positions and parallaxes measured by Hipparcos relative to thi…
Far-ultraviolet Spectroscopy of Old Novae. I. V603 Aquila
Sion, Edward M.; Godon, Patrick; Bisol, Alexandra
We present the results of a synthetic spectral analysis of the far-ultraviolet archival International Ultraviolet Explorer, Hubble Space Telescope (HST), and FUSE observations of the fast old nova V603 Aql, obtained some 90 years after its 1918 nova outburst. Our analysis utilizes the new Hubble fine guidance sensor parallax distance for this near…