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44 papers · 1 filter
Near IR photometry of the old open clusters Berkeley 17 and Berkeley 18. Probing the age of the galactic disc
Giovanni Carraro, Antonella Vallenari, Leo Girardi +1
We report on near IR ( and bands) observations of two regions centered on the old open clusters Berkeley~17 and Berkeley~18, for which only optic…
Kinematics and binaries in young stellar aggregates
Ulisse Munari, Lina Tomasella
Internal kinematics, spectroscopic binaries and galactic motion are investigated for the trapezium system BD+00.1617 (which lies at the heart of the young open cluster Bochum 2) by…
Interacting star clusters in the LMC - Overmerging problem solved by cluster group formation
S. Leon, G. Bergond, A. Vallenari
We present the tidal tail distributions of a sample of candidate binary clusters located in the bar of the Large Magellanic Cloud (LMC). One isolated cluster, SL 268, is presented…
First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars
Eugenio Carretta, Raffaele Gratton, Chris Sneden +1
In this research we use a large sample of field metal-poor stars ([Fe/H]<-1) in different evolutionary phases to prove observationally that (small mass) subgiants (stars brighter t…
Radio and Far-IR Extragalactic Sources at Planck Frequencies
G. De Zotti, L. Toffolatti
We discuss the main uncertainties affecting estimates of small scale fluctuations due to extragalactic sources in the Planck Surveyor frequency bands. Conservative estimates allow…
Identification of absorbing galaxies towards the QSO J2233-606 in the Hubble Deep Field South
L. Tresse, M. Dennefeld, P. Petitjean +2
We present spectroscopic observations of galaxies lying within 1' from the QSO J2233-606 in the HDF-S. Several are found to be coincident in redshift with absorption line systems s…