High-Resolution Chandra X-Ray Imaging and Spectroscopy of the σ Orionis Cluster

  title={High-Resolution Chandra X-Ray Imaging and Spectroscopy of the $\sigma$ Orionis Cluster},
  author={Stephen L. Skinner and Kimberly R. Sokal and David H Cohen and Marc Richard Gagne and Stanley P. Owocki and Richard D. Townsend},
  journal={The Astrophysical Journal},
We present results of a 90 ks Chandra X-ray observation of the young ? Orionis cluster ( -->age ~ 3 Myr ) obtained with the HETGS. We use the high-resolution grating spectrum and moderate-resolution CCD spectrum of the massive central star ? Ori AB ( -->O 9.5 V + B 0.5 V ) to test wind shock theories of X-ray emission and also analyze the high spatial resolution zero-order ACIS-S image of the central cluster region. Chandra detected 42 X-ray sources on the primary CCD (ACIS-S3). All but five… 
HRC-I/Chandra X-ray observations towards σ Orionis
Aims. We investigated the X-ray emission from young stars and brown dwarfs in the σ Orionis cluster (τ ∼ 3M a,d ∼ 385 pc) and its relation to mass, the presence of circumstellar discs, and separation
We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a
New deep XMM-Newton observations to the west of the σ Orionis cluster
Aims. The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ ∼ 3M a,d ∼ 385 pc) and determine constraints on
X-rays from young star clusters: a complement to optical and infrared views
  • F. Damiani
  • Physics
    Proceedings of the International Astronomical Union
  • 2009
Abstract In the last few years, X-ray observational studies of young star clusters have advanced significantly, mainly thanks to the great capabilities of current X-ray observatories such as Chandra
XMM-Newton observations of the young open cluster around λ Orionis ,
Aims. We studied the X-ray properties of the young (∼1−8 Myr) open cluster around the hot (O8 III) star λ Ori and compared them with those of the similarly-aged σ Ori cluster to investigate possible
Detailed X-ray line properties of θ² Ori A in quiescence
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
The Chandra Carina Complex contains 200 known O- and B-type stars. The Chandra survey detected 68 of the 70 O stars and 61 of 127 known B0-B3 stars. We have assembled a publicly available
Stars and brown dwarfs in the σ Orionis cluster - III. OSIRIS/GTC low-resolution spectroscopy of variable sources
Context. Although many studies have been performed so far, there are still dozens of low-mass stars and brown dwarfs in the young sigma Orionis open cluster without detailed spectroscopic
Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis
Aims. We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were
Smooth X-ray variability from Ophiuchi A+B. A strongly magnetized primary B2 star?
X-rays from massive stars are ubiquitous yet not clearly understood. In an XMM-Newton observation devoted to observe the first site of star formation in the Ophiuchi dark cloud, we detect smoothly


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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
A near-infrared/optical/X-ray survey in the centre of σ Orionis
Because of the intense brightness of the OB-type multiple star system σ Ori, the low-mass stellar and substellar populations close to the centre of the very young σ Orionis cluster is poorly know. I
High-Resolution Chandra Spectroscopy of τ Scorpii: A Narrow-Line X-Ray Spectrum from a Hot Star
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
XMM-Newton observations of the σ Ori cluster - I. The complex RGS spectrum of the hot star σ Ori AB
We present XMM-Newton observations of the young (∼2−5 Myr) cluster around the hot (O9.5V) star σ Orionis AB, aimed at obtaining a high resolution RGS spectrum of the hot star as well as EPIC imaging
[ITAL]Chandra[/ITAL] Discovers a Very High Density X-Ray Plasma on the O Star ζ Orionis
We report on a Chandra line spectrum observation of the O supergiant ζ Orionis (O9.7 Ib). A 73.4 ks High-Energy Transmission Grating Spectrometer observation shows a wide range of ionization stages
Chandra spectroscopy of the hot star β Crucis and the discovery of a pre-main-sequence companion
In order to test the O star wind-shock scenario for X-ray production in less luminous stars with weaker winds, we made a pointed 74-ks observation of the nearby early B giant, β Crucis (β Cru; B0.5
X-Ray Emission from Early-Type Stars in the Orion Nebula Cluster
The X-ray properties of twenty ~1 Myr old O, B, and A stars of the Orion Trapezium are examined with data from the Chandra Orion Ultradeep Project (COUP). On the basis of simple theories for X-ray
Chandra Detection of Doppler-shifted X-Ray Line Profiles from the Wind of ζ Puppis (O4 f)
We report on a 67 ks High-Energy Transmission Grating observation of the optically brightest early O star z Puppis (O4 f). Many resolved X-ray lines are seen in the spectra over a wavelength range of
X-ray Line Emission from the Hot Stellar Wind of theta 1 Ori C
We present a first emission line analysis of a high resolution X-ray spectrum of the stellar wind of theta 1 Ori C obtained with the High Energy Transmission grating Spectrometer onboard the Chandra
XMM-Newton observations of the σ Orionis cluster: II. Spatial and spectral analysis of the full EPIC field
We present the results of an XMM- Newton observation of the young (${\sim} 2{-}4$ Myr) cluster around the hot star σ  Orionis. In a previous paper we presented the analysis of the RGS spectrum of the