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17 papers · 1 filter
Nearby young stars selected by proper motion. I. Four new members of the Beta Pictoris moving group from the Tycho-2 catalog
Sebastien Lepine, Michal Simon
We describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions. We show that from the mean motion vector of…
The stellar association around Gamma Velorum and its relationship with Vela OB2
R. D Jeffries, Tim Naylor, F. M. Walter +2
We present the results of a photometric BVI survey of 0.9 square degrees around the Wolf-Rayet binary gamma^2 Vel and its early-type companion gamma^1 Vel. Several hundred PMS star…
The Case for Hypercritical Accretion in M33 X-7
E. Moreno Mendez, G. E. Brown, C. -H. Lee +1
The spin parameter of the black hole in M33 X-7 has recently been measured to be a*=0.77+-0.05 (Liu et al. 2008). It has been proposed that the spin of the 15.65 M_sun black hole i…
The Highly Eccentric Pre-Main Sequence Spectroscopic Binary RX J0529.3+1210
G. N. Mace, L. Prato, L. H. Wasserman +3
The young system RX J0529.3+1210 was initially identified as a single-lined spectroscopic binary. Using high-resolution infrared spectra, acquired with NIRSPEC on Keck II, we measu…
The Star Formation Rate - Dense Gas Relation in Galaxies as Measured by HCN (3-2) Emission
R. S. Bussmann, D. Narayanan, Y. L. Shirley +6
We present observations made with the 10m Heinrich Hertz Sub-Millimeter Telescope of HCN (3-2) emission from a sample of 30 nearby galaxies ranging in infrared luminosity from 10^1…
Variability in the cycle length of the supersoft source RX J0513.9-6951
V. Burwitz, K. Reinsch, J. Greiner +4
The supersoft X-ray binary RX J0513.9-6951 shows cyclic changes between optical-low / X-ray-on states and optical-high / X-ray-off states. It is supposed to be accreting close to t…