Results 81 to 90 of about 239,171 (281)

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, J. F. Albacete-Colombo, J. J. Drake, M. G. Guarcello, V. Kashyap, N. J. Wright, K. Briggs, B. Ercolano, M. McCollough, S. Sciortino   +9 more
doaj   +1 more source

The APEX-CHAMP+ view of the Orion Molecular Cloud 1 core - Constraining the excitation with submillimeter CO multi-line observations [PDF]

, 2011
A high density portion of the Orion Molecular Cloud 1 (OMC-1) contains the prominent, warm Kleinmann-Low (KL) nebula that is internally powered by an energetic event plus a farther region in which intermediate to high mass stars are forming.
Bally, Bally, Bloemen, Boreiko, Dame, Dicker, Drapatz, F. Wyrowski, Furuya, Genzel, Goldsmith, Graf, Güsten, Güsten, Habart, Henney, Herrmann, Hollenbach, Houde, Johnstone, K. M. Menten, Kawamura, Klein, Kutner, L. A. Zapata, Lis, Marrone, Masson, Menten, Mezger, Müller, O’Dell, Pellegrini, R. Güsten, Risacher, Schmid-Burgk, Schöier, T.-C. Peng, van der Tak, Walmsley, Wilner, Wilson, Wilson, Wilson, Wirström, Wiseman, Wiseman, Wyrowski, Zapata, Zapata, Zapata, Zapata, Zapata, Zuckerman   +53 more
core   +3 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, Jack A. Baldwin, Gary J. Ferland, Robert H. Rubin, Peter G. Martin, D. K. Walter, C. R. O'Dell, J. Jeff Hester   +7 more
openaire   +2 more sources

Identification of New Near-Infrared DIBs in the Orion Nebula [PDF]

, 2009
Large organic molecules and carbon clusters are basic building blocks of life, but their existence in the universe has not been confirmed beyond doubt.
Akira Hida, Bessell, Brown, Cami, Danks, Ehrenfreund, Ehrenfreund, Foing, Galazutdinov, Glebocki, Heckman, Heger, Iglesias-Groth, Iglesias-Groth, Jenniskens, Jenniskens, Kurucz, Lawton, Moutou, Noguchi, Poshak Gandhi, Sbordone, Tomohiro Yamaguchi, Toru Misawa, Toru Tamagawa, Welty, Westerlund, Westerlund, York   +28 more
core   +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., Sujatha N. V., Narayanankutty K.   +2 more
doaj   +1 more source

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, L. Ilsedore Cleeves, Thomas J. Haworth, John Bally, Josh A. Eisner, Adam Ginsburg, Ryan D. Boyden, Min Fang, Jinyoung Serena Kim   +8 more
doaj   +1 more source

The chemical composition of the Orion star-forming region: II. Stars, gas, and dust: the abundance discrepancy conundrum

, 2010
We re-examine the recombination/collisional emission line (RL/CEL) nebular abundance discrepancy problem in the light of recent high-quality abundance determinations in young stars in the Orion star-forming region.
Aggarwal, Baldwin, Bresolin, Bresolin, Cunha, Cunha, Draine, Ercolano, Esteban, Esteban, Ferland, Fischer, G. Stasińska, Galavis, Galavis, Galavis, Galavis, García-Rojas, Grigorieva, Hillier, Hily-Blant, Hubeny, Hudson, Jenkins, Keenan, McLaughlin, Mendoza, Mendoza, Mendoza, Mendoza, Menten, Mesa-Delgado, Mesa-Delgado, O’Dell, O’Dell, Pauldrach, Peimbert, Przybilla, Puls, Ramsbottom, Rodríguez, Rosolowsky, Rubin, Rubin, S. Simón-Díaz, Simón-Díaz, Simón-Díaz, Simón-Díaz, Stasińska, Stasińska, Storey, Tachiev, Tachiev, Tayal, Tayal   +54 more
core   +2 more sources

Pumping up the [N I] nebular lines [PDF]

, 2012
The optical [N I] doublet near 5200 {\AA} is anomalously strong in a variety of emission-line objects. We compute a detailed photoionization model and use it to show that pumping by far-ultraviolet (FUV) stellar radiation previously posited as a general ...
Abel, Abel, Abel, Arthur, Baldwin, Bautista, Berrington, Butler, C. R. O'Dell, Chandrasekhar, Crutcher, Draine, Esteban, Fitzpatrick, G. J. Ferland, Gallagher, García-Díaz, García-Díaz, Godefroid, Harvey-Smith, Henney, Henney, Henney, Henney, Henney, Hibbert, Koyama, Lanz, Lanz, Malkov, Mayers, Mellema, Moore, O'Dell, O'Dell, O'Dell, O'Dell, O'Dell, O'Dell, Osterbrock, P. A. M. van Hoof, Patriarchi, Pequignot, R. J. R. Williams, R. L. Porter, Saraph, Shaw, Störzer, Tayal, W. J. Henney, Weigelt, Whalen, Wilson, Zel'Dovich   +53 more
core   +3 more sources

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, L. Loinard, Luis F. Rodríguez, L. G'omez, J. Forbrich, K. Menten, M. Kounkel, A. Mioduszewski, L. Hartmann, J. Tobin, Juana L. Rivera   +10 more
semanticscholar   +1 more source

An Analytical Method for Quantification of Sn Isotope Variations in Geological Materials Using MC‐ICP‐MS

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