Direct constraint on the distance of $\gamma^2$ Velorum from AMBER/VLTI observations

  title={Direct constraint on the distance of \$\gamma^2\$ Velorum from AMBER/VLTI observations},
  author={F. Millour and R. Petrov and O. Chesneau and D. Bonneau and L. Dessart and C. Bechet and I. Tallon-Bosc and M. Tallon and E. Thi'ebaut and F. Vakili and F. Malbet and D. Mourard and G. Zins and A. Roussel and S. Robbe-Dubois and P. Puget and K. Perraut and F. Lisi and E. L. Coarer and S. Lagarde and P. Kern and L. Gluck and G. Duvert and A. Chelli and Y. Bresson and U. Beckmann and P. Antonelli and G. Weigelt and N. Ventura and M. Vannier and J. Valtier and L. Testi and E. Tatulli and D. Tasso and P. Stefanini and P. Stee and W. Solscheid and D. Schertl and P. Salinari and M. Sacchettini and A. Richichi and F. Reynaud and S. Rebattu and Y. Rabbia and T. Preibisch and C. Perrier and F. Pacini and K. Ohnaka and E. Nussbaum and D. Mouillet and J. Monin and P. Mege and P. Mathias and G. Martinot-Lagarde and G. Mars and A. Marconi and Y. Magnard and B. Lopez and D. Contel and J. L. Contel and S. Kraus and D. Kamm and K. Hofmann and O. H. Utrera and M. Heininger and M. Heiden and C. Gil and E. Giani and A. Glentzlin and S. Gennari and A. Gallardo and D. Fraix-Burnet and R. Foy and E. Fossat and T. Forveille and D. Ferruzzi and P. Feautrier and M. Dugu'e and T. Driebe and A. D. D. Souza and A. Delboulb'e and C. Connot and J. Colin and J. Clausse and F. Cassaing and S. Busoni and S. Bonhomme and T. Blocker and J. Behrend and C. Baffa and E. Aristidi and B. Arezki and K. Agabi and B. Acke and M. Accardo and M. Kiekebusch and F. Rantakyro and M. Schoeller},
  journal={Astronomy and Astrophysics},
In this work, we present the first AMBER observations, of the Wolf-Rayet and O (WR+O) star binary system y² Velorum. The AMBER instrument was used with the telescopes UT2, UT3, and UT4 on baselines ranging from 46m to 85m. It delivered spectrally dispersed visibilities, as well as differential and closure phases, with a resolution R = 1500 in the spectral band 1.95-2.17 micron. We interpret these data in the context of a binary system with unresolved components, neglecting in a first… Expand

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