Results 41 to 50 of about 12,515 (261)

Layers in the Central Orion nebula [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
The existence of multiple layers in the inner Orion Nebula has been revealed using data from an Atlas of spectra at 2" and 12 km/s resolution. These data were sometimes grouped over Samples of 10"x10"to produce high Signal to Noise spectra and sometimes grouped into sequences of pseudo-slit Spectra of 12.8"--39" width for high spatial resolution ...
openaire   +2 more sources

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.
Köhler, R., Petr-Gotzens, M. G., Mccaughrean, M. J., Bouvier, J., Duchêne, G., Quirrenbach, A., Zinnecker, H.   +6 more
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Chemical Modeling of Orion Nebula Cluster Disks: Evidence for Massive, Compact Gas Disks with Interstellar Gas-to-dust Ratios

The Astrophysical Journal, 2023
The stellar cluster environment is expected to play a central role in the evolution of circumstellar disks. We use thermochemical modeling to constrain the dust and gas masses, disk sizes, UV and X-ray radiation fields, viewing geometries, and central ...
Ryan D. Boyden, Josh A. Eisner
doaj   +1 more source

Membership of the Orion Nebula Population from the Chandra Orion Ultradeep Project [PDF]

, 2005
The Chandra Orion Ultradeep project (COUP) observation described in a companion paper by Getman et al. provides an exceptionally deep X-ray survey of the Orion Nebula Cluster and associated embedded young stellar objects.
Duquennoy A., Eric D. Feigelson, Giusi Micela, Gordon Garmire, Hambarian V. V., Konstantin V. Getman, Leisa Townsley, Mark J. McCaughrean, Nicolas Grosso, Patrick Broos   +9 more
core   +4 more sources

PPAK Integral Field Spectroscopy survey of the Orion Nebula: Data Release [PDF]

, 2006
We present a low-resolution spectroscopic survey of the Orion nebula which data we release for public use. In this article, we intend to show the possible applications of this dataset analyzing some of the main properties of the nebula.
Baldwin, Baldwin, Benjamin, Benjamin, Bohlin, Breger, Canto, Cardelli, Clegg, Cota, D. Martín-Gordón, Esteban, Esteban, Ferland, Hester, Hummer, J. Alves, J. M. Vilchez, Kaler, Kelz, Kennicutt, Lee, M. A. W. Verheijen, Mathis, Meaburn, N. Cardiel, O'Dell, O'Dell, Osterbrock, Osterbrock, Osterbrock, Pagel, Pagel, Peimbert, Peimbert, Pettini, Pilyugin, Pilyugin, Pogge, Roth, Rubin, S. F. Sánchez, Smits, Stacey, Sánchez, Sánchez, Thronson, van der Werf, Verheijen, Vilchez, Vitrichenko, Wen, Yusef-Zedeh   +52 more
core   +8 more sources

Machine Learning Applied to X-Ray Spectra: Separating Stars in Orion Nebula Cluster from Active Galactic Nuclei in CDFS

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

Multiple star systems in the Orion nebula [PDF]

Astronomy & Astrophysics, 2018
This work presents an interferometric study of the massive-binary fraction in the Orion Trapezium cluster with the recently comissioned GRAVITY instrument. We observed a total of 16 stars of mainly OB spectral type. We find three previously unknown companions for θ1 Ori B, θ2 Ori B, and θ2 Ori C.
GRAVITY collaboration, Karl, Martina, Pfuhl, Oliver, Eisenhauer, Frank, Genzel, Reinhard, Grellmann, Rebekka, Habibi, Maryam, Abuter, Roberto, Accardo, Matteo, Amorim, António, Anugu, Narsireddy, Ávila, Gerardo, Benisty, Myriam, Berger, Jean-Philippe, Bland, Nicolas, Bonnet, Henri, Bourget, Pierre, Brandner, Wolfgang, Brast, Roland, Buron, Alexander, Garatti, Alessio Caratti o, Chapron, Frédéric, Clénet, Yann, Collin, Claude, Foresto, Vincent Coudé du, de Wit, Willem-Jan, de Zeeuw, Tim, Deen, Casey, Delplancke-Ströbele, Françoise, Dembet, Roderick, Derie, Frédéric, Dexter, Jason, Duvert, Gilles, Ebert, Monica, Eckart, Andreas, Esselborn, Michael, Fédou, Pierre, Finger, Gert, Garcia, Paulo, Dabo, Cesar Enrique Garcia, Lopez, Rebeca Garcia, Gao, Feng, Gandron, Éric, Gillessen, Stefan, Gonté, Frédéric, Gordo, Paulo, Grözinger, Ulrich, Guajardo, Patricia, Guieu, Sylvain, Haguenauer, Pierre, Hans, Oliver, Haubois, Xavier, Haug, Marcus, Haußmann, Frank, Henning, Thomas, Hippler, Stefan, Horrobin, Matthew, Huber, Armin, Hubert, Zoltan, Hubin, Norbert, Hummel, Christian A., Jakob, Gerd, Jochum, Lieselotte, Jocou, Laurent, Kaufer, Andreas, Kellner, Stefan, Kandrew, Sarah, Kern, Lothar, Kervella, Pierre, Kiekebusch, Mario, Klein, Ralf, Köhler, Rainer, Kolb, Johan, Kulas, Martin, Lacour, Sylvestre, Lapeyrère, Vincent, Lazareff, Bernard, Bouquin, Jean-Baptiste Le, Léna, Pierre, Lenzen, Rainer, Lévêque, Samuel, Lin, Chien-Cheng, Lippa, Magdalena, Magnard, Yves, Mehrgan, Leander, Mérand, Antoine, Moulin, Thibaut, Müller, Eric, Müller, Friedrich, Neumann, Udo, Oberti, Sylvain, Ott, Thomas, Pallanca, Laurent, Panduro, Johana, Pasquini, Luca, Paumard, Thibaut, Percheron, Isabelle, Perraut, Karine, Perrin, Guy, Pflüger, Andreas, Duc, Thanh Phan, Plewa, Philipp M., Popovic, Dan, Rabien, Sebastian, Ramírez, Andrés, Ramos, Jose, Rau, Christian, Riquelme, Miguel, Rodríguez-Coira, Gustavo, Rohloff, Ralf-Rainer, Rosales, Alejandra, Rousset, Gérard, Sanchez-Bermudez, Joel, Scheithauer, Silvia, Schöller, Markus, Schuhler, Nicolas, Spyromilio, Jason, Straub, Odele, Straubmeier, Christian, Sturm, Eckhard, Suarez, Marcos, Tristram, Konrad R. W., Ventura, Noel, Vincent, Frédéric, Waisberg, Idel, Wank, Imke, Widmann, Felix, Wieprecht, Ekkehard, Wiest, Michael, Wiezorrek, Erich, Wittkowski, Markus, Woillez, Julien, Wolff, Burkhard, Yazici, Senol, Ziegler, Denis, Zins, Gérard   +135 more
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Molecular Hydrogen in Orion as Observed by the Far Ultraviolet Spectroscopic Explorer

, 2005
Diffuse far-ultraviolet stellar emission scattered by dust grains has been observed in a region near the Orion Nebula. In addition to the scattered stellar continuum, emission and absorption features produced by molecular hydrogen have been identified ...
France, K., McCandliss, S. R.
core   +1 more source

Runaway Young Stars near the Orion Nebula [PDF]

The Astrophysical Journal, 2019
Abstract The star-forming region of the Orion Nebula (ONC) is ideal to study the stellar dynamics of young stars in a clustered environment. Using Gaia DR2 we search for pre-main sequence stars with unusually high proper motions that may be representative of a dynamical ejection from unstable young triple systems or other close three ...
Aidan McBride, Marina Kounkel
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Gaia Stellar Kinematics in the Head of the Orion A Cloud: Runaway Stellar Groups and Gravitational Infall [PDF]

, 2019
This work extends previous kinematic studies of young stars in the Head of the Orion A cloud (OMC-1/2/3/4/5). It is based on large samples of infrared, optical, and X-ray selected pre-main sequence stars with reliable radial velocities and Gaia-derived ...
Feigelson, E. D., Garmire, G. P., Getman, K. V., Kuhn, M. A.   +3 more
core   +2 more sources