TY - GEN
T1 - Coordinated Optical/X-ray observations of the CTTS V2129 Oph The Chandra View
AU - Flaccomio, Ettore
AU - Argiroffi, Costanza
AU - Alencar, Silvia
AU - Bouvier, Jerome
AU - Donati, Jean-Francois
AU - Getman, Kosta
AU - Gregory, Scott
AU - Ibrahimov, M
AU - Hussain, Gaitee Ara Jaffer
AU - Jardine, Moira Mary
AU - Skelly, Mairead
AU - Walter, Fred
N1 - The Cool Stars 16 conference (CS16) was held on the University of Washington
campus in Seattle, Washington during August 28 - September 2, 2010. The Cool
Stars series was initiated just over 20 years ago, in 1980, and now consists of meetings
held approximately every two years. This workshop series has become the preeminent
international meeting series covering cool star science. Over the six days of the
meeting, nearly 350 attendees presented and discussed many of the latest research
results in cool star and solar research. The main plenary sessions were spread over
five days and covered core areas of stellar research including the formation and
evolution of low mass stars and brown dwarfs, the determination of fundamental
stellar parameters, magnetic activity, and the solar-stellar connection. In addition to
these traditional areas of cool star research, two less traditional areas received special
attention at CS16: time domain studies of cool stars highlighting many of the exciting
new results emerging from the Kepler satellite; and studies of cool stars in the
galactic context, driven by the large impact the Sloan Digital Sky Survey has had on
cool star research.
In addition to the plenary sessions, the latest research in the field was presented and
discussed in a five day poster session and in 12 splinter sessions which rounded out
the scientific program of the meeting. Topics covered included fundamental stellar
properties from interferometry, multi-dimensional atmospheric modeling,
determining metallicities of the coolest dwarfs, what happens at the fully convective
boundary, planets around cool stars and their habitability, variablity of young stars,
ares and X-rays, and wide field surveys of cool dwarfs. These proceedings summarize
the scientific program presented at the meeting. The printed volume contains
papers from the main plenary sessions, summaries of the 12 splinter sessions, and
papers from the 15 poster finalists selected by the scientific organizing committee at
the meeting. Papers from the remaining poster presentations, as well as the papers
found in this volume, are available in the electronic version of the proceedings.
These proceedings are suitable for researchers and graduate students interested in
learning about the astrophysics of cool stars and the Sun, including formation,
circumstellar disks, magnetic activity, mass loss, and their distribution in the galaxy
PY - 2012
Y1 - 2012
N2 - Young low-mass accreting stars (classical T Tauri stars; CTTSs) possess strong magnetic fields that are responsible for the regulation of the accretion and outflow processes, and the confinement and heating of coronal plasma. Understanding the physics of CTTS magnetospheres and of their interaction with circumstellar disks can elucidate the history and evolution of our own Sun and Solar System, at the stage when planets were being formed. In June 2009 we have conducted an extensive multi-wavelength observing campaign of V2129 Oph, a K5 CTTS in the ρ Ophiuchi molecular cloud, with the goal of obtaining a synoptic view of its photosphere, magnetic field, coronal plasma, and of its accretion spot(s) and funnel flow(s). We here report on the X-ray emission, as observed by the Chandra High Energy Transmission Grating (HETG). High-density plasma, presumably from the accretion shock, is responsible for the soft X-ray emission, at least during the first half of the observation. The X-ray emission from both the coronal plasma (T˜20MK) and the cooler and denser material from the accretion spot (T˜3MK) is observed to vary between the first and second half of the observation. From the high-resolution X-ray spectra we constrain the emission measure of the two components and the density of the cool plasma. Finally we interpret the time variability of the cool plasma component in terms of stellar rotation and the time-changing viewing angle of the accretion stream, as constrained by simultaneous optical observations.
AB - Young low-mass accreting stars (classical T Tauri stars; CTTSs) possess strong magnetic fields that are responsible for the regulation of the accretion and outflow processes, and the confinement and heating of coronal plasma. Understanding the physics of CTTS magnetospheres and of their interaction with circumstellar disks can elucidate the history and evolution of our own Sun and Solar System, at the stage when planets were being formed. In June 2009 we have conducted an extensive multi-wavelength observing campaign of V2129 Oph, a K5 CTTS in the ρ Ophiuchi molecular cloud, with the goal of obtaining a synoptic view of its photosphere, magnetic field, coronal plasma, and of its accretion spot(s) and funnel flow(s). We here report on the X-ray emission, as observed by the Chandra High Energy Transmission Grating (HETG). High-density plasma, presumably from the accretion shock, is responsible for the soft X-ray emission, at least during the first half of the observation. The X-ray emission from both the coronal plasma (T˜20MK) and the cooler and denser material from the accretion spot (T˜3MK) is observed to vary between the first and second half of the observation. From the high-resolution X-ray spectra we constrain the emission measure of the two components and the density of the cool plasma. Finally we interpret the time variability of the cool plasma component in terms of stellar rotation and the time-changing viewing angle of the accretion stream, as constrained by simultaneous optical observations.
UR - http://aspbooks.org/custom/publications/paper/448-0603.html
M3 - Conference contribution
SN - 978-1-58381-776-6
VL - 448
SP - 603
EP - 608
BT - 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
A2 - Johns-Krull, Christopher M.
A2 - Browning, Matthew K.
A2 - West, Andrew A.
PB - Astronomical Society of the Pacific
T2 - 16th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
Y2 - 28 August 2010 through 3 September 2010
ER -