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Start Over Subject open star clusters Subject x-ray sources Facility Chandra
1. Chandra observation of M67
ID:
ivo://CDS.VizieR/J/A+A/418/509
Title:
Chandra observation of M67
Short Name:
J/A+A/418/509
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a 47-ks Chandra/ACIS observation of the old open cluster M67. We detected 25 proper-motion cluster members (including ten new sources) and 12 sources (all new) that we suspect to be members from their locations close to the main sequence (1<B-V<1.7). Of the detected members, 23 are binaries.
2. Chandra observations of Orion Trapezium
ID:
ivo://CDS.VizieR/J/ApJ/549/441
Title:
Chandra observations of Orion Trapezium
Short Name:
J/ApJ/549/441
Date:
21 Oct 2021
Publisher:
CDS
Description:
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 images on the Advanced CCD Imaging Spectrometer provide spatial resolution of 0.5" and moderate energy resolution. Within a 160"x140" region around the Orion Trapezium, we resolve 111 X-ray sources with luminosities between 7x10^28^ and 2x10^32^ergs/s. We do not detect any diffuse emission. All but six sources are identified.
3. Chandra X-ray sources in Orion Nebula Cluster
ID:
ivo://CDS.VizieR/J/ApJ/582/382
Title:
Chandra X-ray sources in Orion Nebula Cluster
Short Name:
J/ApJ/582/382
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this first of two companion papers on the Orion Nebula Cluster (ONC), we present our analysis of a 63ks Chandra HRC-I observation that yielded 742 X-ray detections within the 30'x30' field of view. To facilitate our interpretation of the X-ray image, here we collect a multiwavelength catalog of nearly 2900 known objects in the region by combining 17 different catalogs from the recent literature. We define two reference groups: an infrared sample, containing all objects detected in the K band, and an optical sample comprising low-extinction, well-characterized ONC members. We show for both samples that field object contamination is generally low. Our X-ray sources are primarily low-mass ONC members. The detection rate for optical sample stars increases monotonically with stellar mass from zero at the brown dwarf limit to ~100% for the most massive stars but shows a pronounced dip between 2 and 10M_{sun}_. We determine L_X_ and L_X_/L_bol_ or all stars in our optical sample and utilize this information in our companion paper to study correlations between X-ray activity and other stellar parameters.
4. X-ray sources in IC 348 from Chandra
ID:
ivo://CDS.VizieR/J/AJ/122/866
Title:
X-ray sources in IC 348 from Chandra
Short Name:
J/AJ/122/866
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained a deep (53 ks) X-ray image of the very young stellar cluster IC 348 with the Advanced CCD Imaging Spectrometer on board the Chandra X-Ray Observatory. In our image with a sensitivity limit of ~1x10^28^ergs/s (more than 10 times deeper than our ROSAT images of IC 348), 215 X-ray sources are detected. While 115 of these sources can be identified with known cluster members, 58 X-ray sources are most likely new, still unidentified cluster members. About 80% of all known cluster members with masses between ~0.15 and 2M_{sun}_ are visible as X-ray sources in our image. We discover X-ray emission at levels of ~10^28^ergs/s from four of 13 known brown dwarfs and from three of 12 brown dwarf candidates in IC 348. We also detect X-ray emission from two deeply embedded objects, presumably class I protostars, south of the cluster center. Description:

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