Results 71 to 80 of about 229,704 (266)
The Astrophysical Journal, 2023 Modern X-ray telescopes have detected hundreds of thousands of X-ray sources in the universe. However, current methods to classify these sources using the X-ray data themselves suffer problems—detailed X-ray spectroscopy of individual sources is too time
Pavan R. Hebbar, Craig O. Heinke
doaj +1 more source
Binary stars in the Orion Nebula Cluster [PDF]
Astronomy & Astrophysics, 2006 AbstractWe report on a high-spatial-resolution survey for binary stars in the periphery of the Orion Nebula Cluster, at 5–15 arcmin (0.65 – 2 pc) from the cluster center. We observed 228 stars with adaptive optics systems, in order to find companions at separations of 0.13 – 1.12 arcsec (60 – 500 AU), and detected 13 new binaries.
Monika G. Petr-Gotzens +7 more
openaire +7 more sources
HST Spectroscopy of the Orion Nebula [PDF]
Symposium - International Astronomical Union, 1996 From our recent Faint Object Spectrograph (FOS) observations of the Orion Nebula obtained with the Hubble Space Telescope, we present preliminary results that address the nitrogen abundance. The list of detected lines and their identifications included the first measurement of the N II] 2142 Å line in an H II region.
Reginald J. Dufour +7 more
openaire +2 more sources
Ultraviolet and Infrared Correlation Studies in Orion
Open Astronomy, 2015 We have studied the variation of diffuse ultraviolet (UV) radiation in the northern part of the Orion constellation using a set of eight areas of the GALEX All-Sky Imaging Survey in the far and near UV.
Bose Lakshmi S. +2 more
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X-Ray Spectral Characterization of the Young Cygnus OB2 Population
The Astrophysical Journal Supplement Series, 2023 We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray ...
E. Flaccomio +9 more
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Isolating Dust and Free–Free Emission in ONC Proplyds with ALMA Band 3 Observations
The Astrophysical Journal, 2023 The Orion Nebula Cluster (ONC) hosts protoplanetary disks experiencing external photoevaporation by the cluster’s intense UV field. These “proplyds” are comprised of a disk surrounded by an ionization front.
Nicholas P. Ballering +8 more
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Renaissance Studies, Volume 39, Issue 4, Page 473-492, September 2025.Abstract The patrician Francesco Barbaro (1390–1454) is well known for having been both a first‐class humanist and a figurehead of the Venetian government in the new territories of the Stato da Terra. This article explores the pioneering use of humanist culture in the official praises he received during his political career, which helped shape a ...
Clémence Revest
wiley +1 more source
RADIO MEASUREMENTS OF THE STELLAR PROPER MOTIONS IN THE CORE OF THE ORION NEBULA CLUSTER [PDF]
, 2016 Using multi-epoch Very Large Array observations, covering a time baseline of 29.1 years, we have measured the proper motions of 88 young stars with compact radio emission in the core of the Orion Nebula Cluster (ONC) and the neighboring BN/KL region. Our
S. Dzib +10 more
semanticscholar +1 more source
Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 863-885, December 2024.Key Points A method is described to obtain high precision Sn isotope ratios using the double spike technique in geological reference materials containing 0.03 to 7 μg g−1 of Sn. δ122/118Sn values are reported for sixteen geological RMs. Improved precision was achieved compared with previous studies by using low concentration Sn analyte.
Dipankar Pathak, Klaus Mezger
wiley +1 more source
Slingshot mechanism for clusters: Gas density regulates star density in the Orion Nebula Cluster (M42) [PDF]
, 2017 We characterize the stellar and gas volume density, potential, and gravitational field profiles in the central $\sim$ 0.5 pc of the Orion Nebula Cluster (ONC), the nearest embedded star cluster (or rather, proto-cluster) hosting massive star formation ...
A. Stutz
semanticscholar +1 more source