Aims.We study jet-driving protostars and T Tau stars to characterize their X-ray emission. We seek soft spectral components that may be due to shock emission, and search for soft, shock-induced emission displaced from the stellar position. Methods.We study two stellar samples, the first consisting of lightly absorbed T Tau stars with strong jets, the other containing protostars...
IGR J11014-6103 (also known as the Lighthouse Nebula) is composed of a bow-shock pulsar wind nebula (PWN) and large-scale X-ray jet-like features, all powered by PSR J1101-6101. Previous observations suggest that the jet features stem from a ballistic jet of relativistic particles. In order to confirm the nature of the jet and the counter-jet, we obtained a new deep 250 ks...
We present FEROS high-resolution (R ~ 45 000) optical spectroscopy of 34 Herbig Ae/Be star candidates with previously unknown or poorly constrained spectral types. Within the sample, 16 sources are positionally coincident with nearby (d < 250 pc) star-forming regions (SFRs). All the candidates have reported infrared excess. We determine the spectral type and luminosity class of...
and its applications (New York: John Wiley & Sons) Güdel , M. 2002 , ARA &A, 40 , 217 Güdel , M. , Audard , M. , Kashyap , V. L. , Drake , J. J. , & Guinan , E. F. 2003 , ApJ, 582 , 423 Güdel , M. 2004 ... . , Lumb , D. , Altieri , B. , et al. 2001 , A &A, 365 , L1 Kashyap , V. , Drake , J. J. , Güdel , M. , & Audard , M. 2002 , ApJ, 580 , 1118 Klibanov , M. V. , Sacks , P. E. , & Tikhonravov , A. V. 1995
We report on a sensitive search for H2 1-0 S(1), 1-0 S(0) and 2-1 S(1) ro-vibrational emission at 2.12, 2.22 and 2.25 μm in a sample of 15 Herbig Ae/Be stars employing CRIRES, the ESO-VLT near-infrared high-resolution spectrograph, at R ~ 90 000. We report the detection of the H2 1-0 S(1) line toward HD 100546 and HD 97048. In the other 13 targets, the line is not detected. The...
. Leurini 2 M. Audard 10 11 0 Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB-Facultat de Ciències , Torre C5-parell 2, 08193 Bellaterra , Spain 1 Institut de Radio-Astronomie Millimétrique , 300
Context. Our knowledge of circumstellar disks has traditionally been based on studies of dust. However, gas dominates the disk mass and its study is key to our understanding of accretion, outflows, and ultimately planet formation. The Spitzer Space Telescope provides access to gas emission lines in the mid-infrared, providing crucial new diagnostics of the physical conditions in...
, J. H. M. M. , Benz , A. O. , & Elias , N. M. 1995 , A &A, 301 , 201 Güdel , M. , Guinan , E. F. , & Skinner , S. L. 1997 , ApJ, 483 , 947 Güdel , M. , Audard , M. , Briggs , K. , et al. 2001 , A &A ... , 1277 Ness , J.-U., Schmitt , J. H. M. M. , Audard , M. , Güdel , M. , & Mewe , R. 2003b , A &A, 407 , 347 Ness , J.-U. , & Wichmann , R. 2002 , Astron. Nachr., 323 , 129 Pallavicini , R. , Golub , L
Aims.We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region.Methods.Candidate members have been selected among the X-ray sources detected in 24 fields of the XMM-Newton Extended Survey of the Taurus Molecular Cloud, having an IR counterpart in the 2MASS catalog, based on color–magnitude...
Aims.We analyze 19 bright variable X-ray sources detected in the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST), to characterize the variations with time of their coronal properties and to derive information on the X-ray emitting structures.Methods.We performed time-resolved spectroscopy of the EPIC PN and MOS spectra of the XEST sources, using a model with one...
J.-F. Donati 3 S. G. Gregory 1 T. Montmerle 0 7 A. Maggio 6 C. Argiroffi 5 6 G. Sacco 4 G. Hussain 9 J. Kastner 4 S. H. P. Alencar 8 M. Audard 2 J. Bouvier 7 F. Damiani 6 M. G udel 11 D
We present results of a comprehensive X-ray investigation of the multiple stellar system Castor AB + YY Gem. The observations were obtained with the XMM-Newton observatory. We report the first spatially separated detection and identification of both Castor A and B as frequently flaring X-ray sources. Spectral modeling of the YY Gem and Castor coronal sources indicates a broad...
We report results of deep X-ray observations of AB Doradus obtained with the XMM-Newton observatory during its Performance Verification phase. The main objective of the analysis is a study of the spectral variability of coronal plasma in a very active star, including investigations of the variable thermal structure, abundance variations, and possible density changes during flares...
. , Audard , M. , Briggs , K. , et al. 2001a, A &A, 365 , L336 Gu ¨del, M. , Audard , M. , Magee , H. , et al. 2001b, A &A, 365 , L344 den Herder , J. W. , Brinkman , A. C. , Kahn , S. M. , et al. 2001 , A &A ... . 1993 , ApJ, 418 , L41 Favata , F. , Mewe , R. , Brickhouse , N. S. , et al. 1997 , A &A, 324 , L37 Gabriel , A. H. 1972 , MNRAS, 160 , 99 Gabriel , A. H , & Jordan , C. 1969 , MNRAS, 145 , 241 Gu ¨del, M
. , & Badnell , N. R. 2000 , A &AS, 142 , 317 Gu ¨del, M. , Audard , M. , Briggs , K. , et al. 2001a, A &A, 365 , L336 Gu ¨del, M. , Audard , M. , Magee , H. , et al. 2001b, A &A, 365 , L344 Gu ¨del, M. , Audard
The ESA X-ray Multi Mirror mission, XMM-Newton, carries two identical Reflection Grating Spectrometers (RGS) behind two of its three nested sets of Wolter I type mirrors. The instrument allows high-resolution ( to 500) measurements in the soft X-ray range (6 to 38 Åor 2.1 to 0.3 keV) with a maximum effective area of about 140 cm2 at 15 Å. Its design is optimized for the detection...
