X-Ray Modeling of Very Young Early-Type Stars in the Orion Trapezium: Signatures of Magnetically Confined Plasmas and Evolutionary Implications
@article{Schulz2003XRayMO, title={X-Ray Modeling of Very Young Early-Type Stars in the Orion Trapezium: Signatures of Magnetically Confined Plasmas and Evolutionary Implications}, author={Norbert S. Schulz and Claude R. Canizares and David P. Huenemoerder and K. Tibbets}, journal={The Astrophysical Journal}, year={2003}, volume={595}, pages={365 - 383} }
The Orion Trapezium is one of the youngest and closest star-forming regions within our Galaxy. With a dynamic age of ~3 × 105 yr, it harbors a number of very young hot stars, which likely are on the zero-age main sequence (ZAMS). We analyzed high-resolution X-ray spectra in the wavelength range of 1.5-25 Å of three of its X-ray-brightest members (Θ1 Ori A, C, and E) obtained with the High Energy Transmission Grating Spectrometer (HETGS) on board the Chandra X-Ray Observatory. We measured X-ray…
63 Citations
X-RAY PROPERTIES OF LOW-MASS PRE-MAIN SEQUENCE STARS IN THE ORION TRAPEZIUM CLUSTER
- Physics
- 2015
The Chandra HETG Orion Legacy Project (HOLP) is the first comprehensive set of observations of a very young massive stellar cluster that provides high-resolution X-ray spectra of very young stars…
The Origin of T Tauri X-Ray Emission: New Insights from the Chandra Orion Ultradeep Project
- Physics
- 2005
The Chandra Orion Ultradeep Project (COUP) provides the most comprehensive data set ever acquired on the X-ray emission of pre-main-sequence stars. In this paper, we study the nearly 600 X-ray…
DETAILED X-RAY LINE PROPERTIES OF θ2 Ori A IN QUIESCENCE
- Physics
- 2010
We investigate X-ray emission properties of the peculiar X-ray source θ2 Ori A in the Orion Trapezium region using more than 500 ks of HETGS spectral data in the quiescent state. The amount of…
X-RAY EMISSION AND CORONA OF THE YOUNG INTERMEDIATE-MASS BINARY θ1 Ori E
- Physics
- 2009
θ1 Ori E is a young, moderate mass binary system, a rarely observed case of spectral-type G-giants of about 3 solar masses, which are still collapsing toward the main sequence, where they presumably…
X-Ray Emission-Line Profiles of Three Early-Type Stars Observed with Chandra
- Physics
- 2007
We analyzed the X-ray emission-line profiles of three early-type stars (� Pup, i Ori, andSco) obtained with Chandra. A phenomenological model, where X-ray sources are distributing in wind above some…
Chandra X-ray Observatory high-resolution x-ray spectroscopy of stars: Modeling and interpretation
- Physics
- 2003
The Chandra X-ray Observatory grating spectrometers allow study of stellar spectra at resolutions on the order of 1000. Prior x-ray observatories’ low resolution data have shown that nearly all…
Chandra X-ray observations of the young stellar cluster NGC 6193 in the Ara OB1 association
- Physics
- 2005
A 90-ks Chandra High Energy Transmission Grating observation of the young stellar cluster NGC 6193 in the southern Ara OB1 association detected 43 X-ray sources in a 2 x 2 arcmin 2 core region…
Wind signatures in the X-ray emission-line profiles of the late-O supergiant ζ Orionis
- Physics
- 2006
X-ray line-profile analysis has proved to be the most direct diagnostic of the kinematics and spatial distribution of the very hot plasma around O stars. The Doppler-broadened line profiles provide…
Extraordinarily Hot X-Ray Emission from the O9 Emission-Line Star HD 119682
- Physics
- 2006
We present new optical and X-ray observations to show that the X-ray source 1WGA J1346.5-6255 previously associated with the SNR G309.2-0.6 can be unequivocally identified with the emission-line star…
X‐ray emission characteristics of two Wolf–Rayet binaries: V444 Cyg and CD Cru
- Physics
- 2010
We present X-ray analysis of two Wolf-Rayet (WR) binaries: V444 Cyg and CD Cru using the data from observations with XMM-Newton. The X-ray light curves show the phase locked variability in both…
References
SHOWING 1-10 OF 62 REFERENCES
Chandra X-Ray Observatory Study of the Orion Nebula Cluster and BN/KL Region
- Physics
- 2000
About 1000 X-ray emitting young pre–main-sequence (PMS) stars distributed in mass from ∼0.05 M☉ brown dwarfs to a ∼50 M☉ O star are detected in an image of the Orion Nebula obtained with the Advanced…
X-Ray-emitting Young Stars in the Orion Nebula
- Physics
- 2002
The Orion Nebula Cluster and the molecular cloud in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hr exposure in two observations. We detect…
HIGH RESOLUTION SPECTRA OF STELLAR WINDS IN VERY YOUNG MASSIVE STARS
- Physics
- 2003
We present a series of spectra from hot stars obtained with the high energy transmission grating spectrometer (HETGS) onboard the Chandra X-ray Observatory. Most of the selected stars are located at…
Chandra Observations of Variable Embedded X-Ray Sources in Orion. I. Resolving the Orion Trapezium
- Physics
- 2000
We used the High-Energy Transmission Grating Spectrometer on board the Chandra X-Ray Observatory to perform two observations, separated by 3 weeks, of the Orion Trapezium region. The zeroth-order…
Search for optical coronal line emission from the X-ray sources Epsilon Orionis /B0 Ia/ and Kappa Orionis /B0.5 Ia/
- Physics
- 1981
High signal-to-noise observations have been made at the wavelengths of the lines of (Fe X) 6574 A and (Fe XIV) 5303 A to search for evidence of a coronal region at the base of the winds of epsilon…
High-Resolution Chandra Spectroscopy of τ Scorpii: A Narrow-Line X-Ray Spectrum from a Hot Star
- Physics
- 2003
Long known to be an unusual early-type star by virtue of its hard and strong X-ray emission, τ Scorpii poses a severe challenge to the standard picture of O-star wind-shock X-ray emission. The…
ASCA X-Ray Spectroscopy of the Unusual B0 V Star τ Scorpii
- Physics
- 1997
We have obtained a high-quality ASCA spectrum of the MK standard B0 V star τ Sco in order to test the standard wind-shock picture of OB star X-ray production. The fluxes in three line complexes from…
High-Energy Processes in Young Stellar Objects
- Physics, Geology
- 1999
▪ Abstract Observational studies of low-mass stars during their early stages of evolution, from protostars through the zero-age main sequence, show highly elevated levels of magnetic activity. This…
Theoretical Profile Shapes for Optically Thin X-Ray Emission Lines from Spherical Stellar Winds
- Physics
- 2001
One of the major outstanding problems in hot star wind theory is an understanding of the observed X-ray emissions from the early-type B, O, and Wolf-Rayet (WR) stars. The latest X-ray satellites…
New Challenges for Wind Shock Models: The Chandra Spectrum of the Hot Star δ Orionis
- Physics
- 2002
The Chandra spectrum of δ Ori A shows emission lines from hydrogen- and helium-like states of Si, Mg, Ne, and O, along with N VII Lyα and lines from ions in the range Fe XVII-Fe XXI. In contrast to…