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Searching for spiral features in the outer Galactic disk. The field towards WR38 and WR38a
Giovanni Carraro, Edgardo Costa
The detailed spiral structure in the outer Galactic disk is still poorly known, and for several Galactic directions we rely on model extrapolations. One of these regions is the fou…
Blue Straggler Stars in Galactic Open Clusters and the effect of field star contamination
G. Carraro, R. A. Vazquez, A. Moitinho
We investigate the distribution of Blue Straggler stars in the field of three open star clusters. The main purpose is to highlight the crucial role played by general Galactic disk…
The old open cluster NGC 2112: updated estimates of fundamental parameters based on a membership analysis
Giovanni Carraro, Sandro Villanova, Pierre Demarque +2
We report on a new, wide field (), multicolor (), photometric campaign in the area of the nearby old open cluster NGC 2112. At the same time,…
Stellar populations in the Canis Major over-density
Giovanni Carraro, Andre' Moitinho, Ruben A. Vazquez
We performed a photometric multicolor survey of the core of the Canis Major over-density at l 244, -8.0, reaching V = 22 and covering 0.3 x 1 degree. The main aim is to unravel the…
Constraints to Uranus' Great Collision. IV. The Origin of Prospero
Gabriela Parisi, Giovanni Carraro, Michele Maris +1
It is widely accepted that the large obliquity of Uranus is the result of a great tangential collision (GC) with an Earth size proto-planet at the end of the accretion. We attempt…
Spiral structure in the outer Galactic disk. I. The Third Galactic Quadrant
Ruben A. Vazquez, Jorge May, Giovanni Carraro +3
We combine optical and radio observations to trace the spiral structure in the Third Quadrant of the Milky Way. The optical observations consist of a large sample of young open clu…
Old open clusters in the outer Galactic disk
Giovanni Carraro, Douglas Geisler, Sandro Villanova +2
The outer parts of the Milky Way disk are believed to be one of the main arenas where the accretion of external material in the form of dwarf galaxies and subsequent formation of s…
Using globular clusters to test gravity in the weak acceleration regime
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi +1
We report on the results from an ongoing program aimed at testing Newton's law of gravity in the low acceleration regime using globular clusters. It is shown that all clusters stud…
The anticenter old open cluster NGC 1883: radial velocity and metallicity
Sandro Villanova, Gustavo Baume, Giovanni Carraro
Having already reported on the first photometric study of the intermediate-age open cluster NGC 1883 (Carraro et al. 2003), we present in this paper the first spectroscopic multi-e…
Light curves and colours of the faint Uranian irregular satellites Sycorax, Prospero, Stephano, Setebos and Trinculo
Michele Maris, Giovanni Carraro, M. Gabriela Parisi
After the work of Gladman et al. (1998), it is now assessed that many irregular satellites are orbiting around Uranus. Despite many studies have been performed in past years, very…
Whiting 1: the youngest globular cluster associated with the Sgr dSph
Giovanni Carraro, Robert Zinn, Christian Moni Bidin
Recently, Carraro (2005) drew attention to the remarkable star cluster Whiting 1 by showing that it lies about 40 kpc from the Sun and is therefore unquestionably a member of the G…
The Space Motion of the Globular Cluster NGC 6397
Jasonjot S. Kalirai, Jay Anderson, Harvey B. Richer +12
As a by-product of high-precision, ultra-deep stellar photometry in the Galactic globular cluster NGC 6397 with the Hubble Space Telescope, we are able to measure a large populatio…
Observational templates of star cluster disruption. The stellar group NGC 1901 in front of the Large Magellanic Cloud
Giovanni Carraro, Raul de la Fuente Marcos, Sandro Villanova +4
Observations indicate that present-day star formation in the Milky Way disk takes place in stellar ensembles or clusters rather than in isolation. Bound, long lived stellar groups…
The extended star formation history of the star cluster NGC 2154 in the Large Magellanic Cloud
Gustavo Baume, Giovanni Carraro, Edgardo Costa +2
The color-magnitude diagram (CMD) of the intermediate-age Large Magellanic Cloud (LMC) star cluster NGC 2154 and its adjacent field, has been analyzed using Padova stellar models t…
Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509 and VdB-Hagen 4
Giovanni Carraro, Edgardo Costa
The stellar populations in the outer Galactic disk are nowadays a subject of wide interest. To contribute to a better picture of this part of the Galaxy, we have studied the nature…
Using globular clusters to test gravity in the weak acceleration regime: NGC 7099
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi +1
A test of Newton's law of gravity in the low acceleration regime using globular clusters is presented. New results for the core collapsed globular cluster NGC 7099 are given. The r…
Time series photometry of the dwarf planet ERIS (2003 UB313)
Giovanni Carraro, Michele Maris, Daniel Bertin +1
The dwarf planet Eris (2003 UB313, formerly known also as ``Xena'') is the largest KBO up to now discovered. Despite being larger than Pluto and bearing many similarities with it,…
Photometry of a Galactic field at l = 232, b = -6. The old open cluster Auner 1, the Norma-Cygnus spiral arm and the signature of the warped Galactic Thick Disk
Giovanni Carraro, Andre' Moitinho, Manuela Zoccali +2
We perform a detailed photometric study of the stellar populations in a Galactic Field at l = 232, b = -6 in the Canis Major (CMa) constellation. We present the first U,B,V,I photo…
The absolute motion of the peculiar cluster NGC6791
L. R. Bedin, G. Piotto, G. Carraro +2
We present improved values of the three components of the absolute space velocity of the open cluster NGC6791. One HST ACS/WFC field with two-epoch observations provides astrometri…
New brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data
N. Lodieu, N. C. Hambly, R. F. Jameson +3
We present first results from a deep (J = 18.7), wide-field (6.5 square degrees) infrared (ZYJHK) survey in the Upper Sco association conducted within the science verification phas…
Fundamental parameters of six neglected old open clusters
Giovanni Carraro, Annapurni Subramaniam, Kenneth A. Janes
In this paper we present the first CCD photometry of six overlooked old open clusters (Berkeley 44, NGC 6827, Berkeley 52, Berkeley 56, Skiff 1 and Berkeley 5) and derive est…
Absolute motions of globular clusters. II. [HST astrometry and VLT radial velocities in NGC6397]
A. Milone, S. Villanova, L. R. Bedin +6
In this paper we present a new, accurate determination of the three components of the absolute space velocity of the Galactic globular cluster NGC6397 (l 338d, b -12d). We used thr…
Outer structure of the Galactic warp and flare: explaining the Canis Major over-density
Y. Momany, S. Zaggia, G. Gilmore +4
(Abridged) We derive the structure of the Galactic stellar Warp and Flare using 2MASS RC and RGB stars, selected at mean heliocentric distances of 3, 7 and 17 kpc. Our results are:…
Spiral structure of the Third Galactic Quadrant and the solution to the Canis Major debate
A. Moitinho, R. A. Vazquez, G. Carraro +3
With the discovery of the Sagittarius dwarf spheroidal (Ibata et al. 1994), a galaxy caught in the process of merging with the Milky Way, the hunt for other such accretion events h…