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17 results on '"Kaspi, V.M."'

2. The Hipparcos mission.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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3. Gaia.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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4. The torques on Hipparcos as observed over the mission.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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5. The Photometric Data.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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6. Payload calibrations.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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7. Spacecraft-Parameter Calibrations.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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8. The mission timeline.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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9. Fully-dynamic attitude fitting.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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10. Kinematics of the solar neighbourhood.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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11. A free-floating rigid body in space.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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12. Individual, single stars.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., Leeuwen, Floor van, and van Leeuwen, Floor

Published
2007
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13. Hipparcos astrometry.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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14. Groups of single stars.

Author

Burton, W.B., Bertola, F., Cassinelli, J.P., Cesarsky, C.J., Ehrenfreund, P., Engvold, O., Heck, A., Den Heuvel, E.P.J. van, Kaspi, V.M., Kuijpers, J.M.E., Der Laan, H. van, Murdin, P.G., Pacini, F., Radhakrishnan, V., Somov, B.V., Sunyaev, R.A., and Leeuwen, Floor van

Published
2007
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16. The Variable X-ray and Near-IR Behavior of the Particularly Anomalous X-ray Pulsar 1E 1048.1-5937

Author

Cindy R. Tam, Fotis P. Gavriil, Rim Dib, Victoria M. Kaspi, Peter M. Woods, Cees Bassa, C. Bassa, Z. Wang, A. Cumming, V. M. Kaspi, Bassa, C.G., Wang, Z., Cumming, A., and Kaspi, V.M.

Subjects
Physics, Astronomy, Astrophysics (astro-ph), X-ray, Quiescent period, Flux, FOS: Physical sciences, Context (language use), Astrophysics, Magnetar, Pulsar, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, X-ray pulsar
Abstract

We present the results of X-ray and near-IR observations of the anomalous X-ray pulsar 1E 1048.1-5937, believed to be a magnetar. This AXP underwent a period of extreme variability during 2001-2004, but subsequently entered an extended and unexpected quiescence in 2004-2006, during which we monitored it with RXTE, CXO, and HST. Its timing properties were stable for >3 years throughout the quiescent period. 1E 1048.1-5937 again went into outburst in March 2007, which saw a factor of >7 total X-ray flux increase which was anti-correlated with a pulsed fraction decrease, and correlated with spectral hardening, among other effects. The near-IR counterpart also brightened following the 2007 event. We discuss our findings in the context of the magnetar and other models., 3 pages, 4 figures. To appear in the proceedings of the "40 Years of Pulsars: Millisecond Pulsars, Magnetars and More" conference, held 12-17 August 2007, in Montreal QC (AIP, in press, eds: C. Bassa, Z. Wang, A. Cumming, V. Kaspi)

Published
2008

17. The Discovery of an Eccentric Millisecond Pulsar in the Galactic Plane

Author

David J. Champion, Scott M. Ransom, Patrick Lazarus, Fernando Camilo, Victoria M. Kaspi, David J. Nice, Paulo C. C. Freire, James M. Cordes, Jason W. T. Hessels, Cees Bassa, Duncan R. Lorimer, Ingrid H. Stairs, Joeri van Leeuwen, Zaven Arzoumnian, Don C. Backer, N. D. Ramesh Bhat, Shami Chatterjee, Fronefield Crawford, Julia S. Deneva, Claude-André Faucher-Giguère, B. M. Gaensler, JinLin Han, Fredrick A. Jenet, Laura Kasian, Vlad I. Kondratiev, Michael Kramer, Joseph Lazio, Maura A. McLaughlin, Ben W. Stappers, Arun Venkataraman, Wouter Vlemmings, C. Bassa, Z. Wang, A. Cumming, V. M. Kaspi, High Energy Astrophys. & Astropart. Phys (API, FNWI), Bassa, C.G., Wang, Z., Cumming, A., and Kaspi, V.M.

Subjects
Physics, 010308 nuclear & particles physics, Astronomy, Astrophysics::High Energy Astrophysical Phenomena, X-ray binary, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Binary pulsar, Neutron star, Pulsar, Millisecond pulsar, Globular cluster, 0103 physical sciences, Binary star, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Astrophysics::Galaxy Astrophysics, X-ray pulsar
Abstract

The evolution of binary systems is governed by their orbital properties and the stellar density of the local environment. Studies of neutron stars in binary star systems offer unique insights into both these issues. In an Arecibo survey of the Galactic disk, we have found PSR J1903+0327, a radio emitting neutron star (a "pulsar") with a 2.15 ms rotation period, in a 95-day orbit around a massive companion. Observations in the infra-red suggests that the companion may be a main-sequence star. Theories requiring an origin in the Galactic disk cannot account for the extraordinarily high orbital eccentricity observed (0.44) or a main-sequence companion of a pulsar that has spin properties suggesting a prolonged accretion history. The most likely formation mechanism is an exchange interaction in a globular star cluster. This requires that the binary was either ejected from its parent globular cluster as a result of a three-body interaction, or that that cluster was disrupted by repeated passages through the disk of the Milky Way.

Published
2008

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