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Accurate classification of 28 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue
P. Parisi, N. Masetti, E. Jiménez-Bailón +12
Through an optical campaign performed at 4 telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we have obtained optica…
Strengthening the Open Cluster Distance Scale via VVV Photometry
Daniel J. Majaess, David G. Turner, C. Moni Bidin +14
Approximately 14% of known Galactic open clusters possess absolute errors 20% as evaluated from n>3 independent distance estimates, and the statistics for age estimates are markedl…
The first confirmed microlens in a globular cluster
P. Pietrukowicz, D. Minniti, Ph. Jetzer +2
In 2000 July/August a microlensing event occurred at a distance of 2.33 arcmin from the center of the globular cluster M22 (NGC6656), observed against the dense stellar field of th…
Light echoes reveal an unexpectedly cool Eta Carinae during its 19th-century Great Eruption
A. Rest, J. L. Prieto, N. R. Walborn +14
Eta Carinae (Eta Car) is one of the most massive binary stars in the Milky Way. It became the second-brightest star in the sky during its mid-19th century "Great Eruption," but the…
Report of IAU Commission 30 on Radial Velocities (2009-2012)
G. Torres, H. Levato, C. Lovis +11
Brief summaries are given of the following subjects of interest to IAU Commission 30: Large-scale radial-velocity surveys; The role of radial-velocity measurements in studies of st…
The nature of 19 X-ray sources detected with INTEGRAL
N. Masetti, P. Parisi, E. Jimenez-Bailon +14
Since its launch on October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detectio…