Results 31 to 40 of about 172,294 (371)

Burst occurrence in young massive stellar objects [PDF]

Monthly notices of the Royal Astronomical Society, 2018
Episodic accretion-driven outbursts are an extreme manifestation of accretion variability. It has been proposed that the development of gravitational instabilities in the proto-circumstellar medium of massive young stellar objects (MYSOs) can lead to ...
M. M.-A., I. VorobyovE., G. ElbakyanV., B. Stecklum, J. Eisloffel, Sobolev A. M. Astrophysics Group, S. O. Physics, Astronomy, U. Exeter, Exeter EX4 4QL, U. K. Astrophysics, T. U. O. Vienna, Vienna, A. D. O. Physics, Southern Federal University, Stachki, Rostov-on-Do, R. T. L. Tautenburg, Sternwarte, Tautenburg, G. A. Observatory, Institute for Fundamental Sciences, Mathematics, Ural Federal University, Ekaterinburg, Russian Federation.   +25 more
semanticscholar   +1 more source

Young stellar objects close to Sgr A* [PDF]

Proceedings of the International Astronomical Union, 2013
AbstractWe aim at modeling small groups of young stars such as IRS 13N, 0.1 pc away from Sgr A*, which is suggested to contain a few embedded massive young stellar objects. We perform hydrodynamical simulations to follow the evolution of molecular clumps orbiting around a 4 × 106 M⊙ black hole, to constrain the formation and the physical conditions of ...
B. Jalali, F. I. Pelupessy, A. Eckart, S. Portegies Zwart, N. Sabha, A. Borkar, J. Moultaka, K. Mužić, L. Moser   +8 more
openaire   +2 more sources

A Disk Census for Young Brown Dwarfs [PDF]

, 2003
Recent surveys have identified sub-stellar objects down to planetary masses in nearby star-forming regions. Reliable determination of the disk frequency in young brown dwarfs is of paramount importance to understanding their origin.
Armitage P. J., Beate Stelzer, Comeron F., Comeron F., Comeron F., David R. Ardila, Karl E. Haisch, Jr., Moorwood A., Ray Jayawardhana   +8 more
core   +4 more sources

A search for ionized jets towards massive young stellar objects [PDF]

, 2016
Radio continuum observations using the Australia telescope compact array at 5.5, 9.0, 17.0 and 22.8 GHz have detected free-free emission associated with 45 of 49 massive young stellar objects and HII regions.
S. Purser, S. Lumsden, M. Hoare, J. Urquhart, J. Urquhart, N. Cunningham, N. Cunningham, C. Purcell, K. Brooks, G. Garay, A. E. Guzmán, M. Voronkov   +11 more
semanticscholar   +1 more source

Resolved 24.5 micron emission from massive young stellar objects [PDF]

, 2008
Massive young stellar objects (MYSO) are surrounded by massive dusty envelopes. Our aim is to establish their density structure on scales of ~1000 AU, i.e.
Alvarez, Alvarez, Aspin, Becker, Beichman, Beltrán, Beuther, Campbell, Castelaz, Cesaroni, Cesaroni, Cesaroni, Chini, Chini, Churchwell, Claussen, Cohen, Cohen, Cohen, Curiel, Dale, De Buizer, De Buizer, De Buizer, De Buizer, de Graauw, de Wit, de Wit, Deharveng, Dent, Di Francesco, Draine, Evans, Evans, Evans, Evans, Faison, Forrest, Gear, Ghosh, Giannakopoulou, Gibb, Greenhill, Guertler, Gómez, H. Kataza, Hackwell, Harvey, Harvey, Hatchell, Hatchell, Hayashi, Henning, Henning, Henning, Herbst, Hoare, Hoare, Hofner, Howard, Howell, Hughes, Imai, Indebetouw, Itoh, Ivezic, Jaffe, Jenness, Jiang, Jiménez-Serra, Kastner, Kastner, Kessler, Klein, Kurtz, Lada, Lada, Ladd, Lenzen, Lenzen, Lester, Longmore, M. G. Hoare, M. Honda, Marsh, Martín-Pintado, Massi, Mathis, Meakin, Menten, Mezger, Minchin, Minier, Moffat, Mottram, Mueller, Nakano, Ossenkopf, Patel, Peretto, Preibisch, Preibisch, Preibisch, R. D. Oudmaijer, Richardson, Robitaille, Rodón, S. Sako, Saito, Saito, Scarrott, Schreyer, Schreyer, Shepherd, Shuping, Simon, Simon, Simon, Sloan, Snell, Snell, Sridharan, Su, T. Fujiyoshi, T. Miyata, T. Onaka, T. Yamashita, Tamura, Tatebe, Terebey, Thompson, Thompson, Thronson, Thronson, Tobin, Tofani, Torrelles, Trinidad, van der Tak, van der Tak, van der Tak, W. J. de Wit, Walker, Walker, Ward-Thompson, Weigelt, Weintraub, Whitney, Williams, Willner, Wilson, Wolfire, Wynn-Williams, Wynn-Williams, Wynn-Williams, Wynn-Williams, Y. K. Okamoto, Yorke, Zapata, Zavagno, Zubko   +160 more
core   +3 more sources

A rich population of free-floating planets in the Upper Scorpius young stellar association [PDF]

Nature Astronomy, 2021
The nature and origin of free-floating planets (FFPs) are still largely unconstrained because of a lack of large homogeneous samples to enable a statistical analysis of their properties.
N. Miret-Roig, H. Bouy, S. Raymond, Motohide Tamura, E. Bertin, D. Barrado, J. Olivares, P. Galli, J. Cuillandre, L. Sarro, A. Berihuete, N. Hu'elamo   +11 more
semanticscholar   +1 more source

Infrared Interferometric Observations of Young Stellar Objects [PDF]

The Astrophysical Journal, 2000
We present infrared observations of four young stellar objects using the Palomar Testbed Interferometer (PTI). For three of the sources, T Tau, MWC 147 and SU Aur, the 2.2 micron emission is resolved at PTI's nominal fringe spacing of 4 milliarcsec (mas), while the emission region of AB Aur is over-resolved on this scale.
Akeson, R. L., Ciardi, D. R., van Belle, G. T., Creech-Eakman, M. J., Lada, E. A.   +4 more
openaire   +2 more sources

Saving Early Disk Formation of Young Stellar Objects from the Magnetic Braking Catastrophe [PDF]

, 2018
Previous observations and ideal magneto-hydrodynamic (MHD) simulations have reported that magnetic fields aligned with the rotation axis, often the bipolar outflow direction, in the youngest protostellar systems prevent a rotationally supported disk from
W. Kwon, I. Stephens, J. Tobin, L. Looney, Zhi-Yun Li, F. V. D. Tak, Richard Crutcher Kasi, Ust, Cfa, U. Oklahoma, U. Illinois, U. Virginia, Sron, K. Institute   +13 more
semanticscholar   +1 more source

The GRAVITY young stellar object survey

Astronomy & Astrophysics, 2019
Contexto. Los estudios de la distribución del polvo, la composición y la evolución de los discos protoplanetarios proporcionan pistas para comprender la formación de planetas. Sin embargo, se sabe poco sobre las regiones más internas de los discos donde se espera que se formen los planetas telúricos. Objetivos.
Y.-I. Bouarour, K. Perraut, F. Ménard, W. Brandner, A. Caratti o Garatti, P. Caselli, E. van Dishoeck, C. Dougados, R. Garcia Lopez, R. Grellmann, Thomas Henning, L. Klarmann, Lucas Labadie, A. Natta, J. Sánchez-Bermúdez, W. F. Thi, P. T. de Zeeuw, A. Amorim, M. Bauböck, M. Benisty, J.‐P. Berger, Y. Clénet, V. Coudé du Foresto, G. Duvert, A. Eckart, F. Eisenhauer, F. Eupen, M. Filho, F. Gao, Paulo J. V. Garcia, É. Gendron, R. Genzel, S. Gillessen, A. Jiménez-Rosales, L. Jocou, S. Hippler, M. Horrobin, Z. Hubert, P. Kervella, S. Lacour, J.-B. Le Bouquin, Pierre Léna, T. Ott, T. Paumard, G. Perrin, O. Pfuhl, G. Rousset, S. Scheithauer, J. Shangguan, Julia Stadler, O. Straub, C. Straubmeier, E. Sturm, F. Vincent, S. D. von Fellenberg, F. Widmann, Michael Wiest   +56 more
openaire   +1 more source

Photometric variability of massive young stellar objects [PDF]

Astronomy & Astrophysics, 2018
The Vista Variables in the Via Lactea (VVV) survey has allowed for an unprecedented number of multi-epoch observations of the southern Galactic plane. In a recent paper, 13 massive young stellar objects (MYSOs) have already been identified within the highly variable (ΔKs > 1 mag) YSO sample of another published work.
Teixeira, G. D. C., Kumar, M. S. N., Smith, L., Lucas, P. W., Morris, C., Borissova, J., Monteiro, M. J. P. F. G., Caratti o Garatti, A., Contreras Peña, C., Froebrich, D., Gameiro, J. F.   +10 more
openaire   +3 more sources