Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Briggs, K. R."'
Autor:
Guedel, M., Audard, M., Bacciotti, F., Bary, J. S., Briggs, K. R., Cabrit, S., Carmona, A., Codella, C., Dougados, C., Eisloeffel, J., Gueth, F., Guenther, H. M., Herczeg, G., Kundurthy, P., Matt, S. P., Mutel, R. L., Ray, T., Schmitt, J. H. M. M., Schneider, P. C., Skinner, S. L., van Boekel, R.
We report on new X-ray observations of the classical T Tauri star DG Tau. DG Tau drives a collimated bi-polar jet known to be a source of X-ray emission perhaps driven by internal shocks. The rather modest extinction permits study of the jet system t
Externí odkaz:
http://arxiv.org/abs/1101.2780
At fast rotation rates the coronal activity of G- and K-type stars has been observed to "saturate" and then decline again at even faster rotation rates -- a phenomenon dubbed "super-saturation". In this paper we investigate coronal activity in fast-r
Externí odkaz:
http://arxiv.org/abs/1010.2152
Autor:
Guedel, M., Lahuis, F., Briggs, K. R., Carr, J., Glassgold, A. E., Henning, Th., Najita, J. R., van Boekel, R., van Dishoeck, E.
(Abridged) We have conducted a study of [NeII] line emission based on a sample of 92 pre-main sequence stars mostly belonging to the infrared Class II, including 13 accreting transition disk objects and 14 objects driving jets and outflows. We find s
Externí odkaz:
http://arxiv.org/abs/1006.2848
Autor:
Audard, M., Stringfellow, G. S., Güdel, M., Skinner, S. L., Walter, F. M., Guinan, E. F., Hamilton, R. T., Briggs, K. R., Baldovin-Saavedra, C.
Abriged version for astroph: The young late-type star V1118 Orionis was in outburst from 2005 to 2006. We followed the outburst with optical and near-infrared photometry; the X-ray emission was further probed with observations taken with XMM-Newton a
Externí odkaz:
http://arxiv.org/abs/0912.3224
Publikováno v:
Astrophys.J.696:766-774,2009
The variable star V1735 Cyg (= Elias 1-12) lies in the IC 5146 dark cloud and is a member of the class of FU Orionis objects whose dramatic optical brightenings are thought to be linked to episodic accretion. We report the first X-ray detections of V
Externí odkaz:
http://arxiv.org/abs/0901.3514
We have obtained and analyzed Chandra ACIS-S observations of the strongly accreting classical T Tauri star DG Tau. Our principal goals are to map the immediate environment of the star to characterize possible extended X-rays formed in the jet, and to
Externí odkaz:
http://arxiv.org/abs/0712.1330
Most stars form as members of large associations within dense, very cold (10-100 K) molecular clouds. The nearby giant molecular cloud in Orion hosts several thousand stars of ages less than a few million years, many of which are located in or around
Externí odkaz:
http://arxiv.org/abs/0712.0476
Autor:
Audard, M., Osten, R. A., Brown, A., Briggs, K. R., Guedel, M., Hodges-Kluck, E., Gizis, J. E.
Magnetic activity in ultracool dwarfs, as measured in X-rays and H$\alpha$, shows a steep decline after spectral type M7-M8. So far, no L dwarf has been detected in X-rays. In contrast, L dwarfs may have higher radio activity than M dwarfs. We observ
Externí odkaz:
http://arxiv.org/abs/0707.1882
Autor:
Briggs, K. R., Guedel, M., Telleschi, A., Preibisch, Th., Stelzer, B., Bouvier, J., Rebull, L., Audard, M., Scelsi, L., Micela, G., Grosso, N., Palla, F.
The Taurus-Auriga star-forming complex hosts the only population of T Tauri stars in which an anticorrelation of X-ray activity and rotation period has been observed. We have used XMM-Newton's European Photon Imaging Cameras to perform the most sensi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701422
We test models for the generation of X-rays in accreting T Tauri stars (TTS), using X-ray data from the classical TTS T Tau. High-resolution spectroscopy from the Reflection Grating Spectrometers on XMM-Newton is used to infer electron densities, ele
Externí odkaz:
http://arxiv.org/abs/astro-ph/0612589