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Using globular clusters to test gravity in the weak acceleration regime: NGC 6171
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
As part of an ongoing program to test Newton's law of gravity in the low acceleration regime using globular clusters, we present here new results obtained for NGC 6171. Combining V…
Taking the pulse of the shortest orbital period binary system RX J0806.3+1527
G. L. Israel, S. Covino, S. Dall'Osso +8
RX J0806.3+1527 is thought to be a 321s orbital period (the shortest known) double white dwarf binary system. According to the double degenerate binary (DDB) scenario this source i…
Indirect evidence for an active radio pulsar in the quiescent state of the transient ms pulsar SAX J1808.4-3658
S. Campana, P. D'Avanzo, J. Casares +6
Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powe…
A flash in the dark: UVES/VLT high resolution spectroscopy of GRB afterglows
F. Fiore, V. D'Elia, D. Lazzati +17
We present the first high resolution (R=20000--45000, corresponding to 14 km/s at 4200A to 6.6 km/s at 9000A) observations of the optical afterglow of Gamma Ray Bursts. GRB020813 a…
Berkeley 29, the most distant old open cluster
M. Tosi, L. Di Fabrizio, A. Bragaglia +2
We present CCD BVI photometry of the old open cluster Berkeley 29, located in the anticentre direction. Using the synthetic Colour - Magnitude Diagrams technique we estimate at the…
VLT FORS-1 observations of NGC 6397: Evidence for mass segregation
G. Andreuzzi, V. Testa, G. Marconi +3
We present (V,V-I) VLT-FORS1 observations of the Galactic Globular Cluster NGC 6397. We derive accurate color--magnitude diagrams and luminosity functions (LFs) of the cluster Main…