Results 31 to 40 of about 35,614 (300)

Wind-accretion disks in wide binaries, second generation protoplanetary disks and accretion onto white dwarfs

, 2012
Mass transfer from an evolved donor star to its binary companion is a standard feature of stellar evolution in binaries. In wide binaries, the companion star captures some of the mass ejected in a wind by the primary star.
Alexander, Andrews, Arnett, Bath, Bath, Bath, Bildsten, Bromley, Busso, Cannizzo, Chambers, Chiang, D'Alessio, de Val-Borro, Duquennoy, Hagai B. Perets, Han, Ireland, Kenyon, Livio, Lynden-Bell, Mastrodemos, Mikolajewska, Noebauer, Perets, Scott J. Kenyon, Shen, Soker, Sokoloski, Waldman, Wang   +30 more
core   +1 more source

X-Shooter study of accretion in Chamaeleon I: II. A steeper increase of accretion with stellar mass for very low mass stars? [PDF]

, 2017
The dependence of the mass accretion rate on the stellar properties is a key constraint for star formation and disk evolution studies. Here we present a study of a sample of stars in the Chamaeleon I star forming region carried out using the VLT/X ...
Alcala, J. M., Antoniucci, S., Fedele, D., Henning, T., Herczeg, G. J., Manara, C. F., Mohanty, S., Mulders, G. D., Natta, A., Pascucci, I., Prusti, T., Rigliaco, E., Testi, L.   +12 more
core   +2 more sources

Interaction of young stellar object jets with their accretion disk [PDF]

Astronomy & Astrophysics, 2005
I reexamine recent observations of velocity profiles across jets blown by young stellar objects, and argue that the observations do not support the interpretation of jets rotating around their symmetry axes. Instead, I propose that the interaction of the jets with a twisted-tilted (wrapped) accretion disk can form the observed asymmetry in the jets ...
openaire   +2 more sources

Spitzer observations of the Orion OB1 association: disk census in the low mass stars

, 2007
We present new Spitzer Space Telescope observations of two fields in the Orion OB1 association. We report here IRAC/MIPS observations for 115 confirmed members and 41 photometric candidates of the ~10 Myr 25 Orionis aggregate in the OB1a subassociation ...
A. K. Vivas, Baraffe I., C. Briceno, D'Alessio P., J. Downes, J. Muzerolle, Jesus Hernandez, L. Allen, L. Hartmann, Nuria Calvet, R. Gutermuth, Schuster M. T., Siess L.   +12 more
core   +1 more source

Selfgravity and QSO disks [PDF]

, 2001
It is well known that the outer parts of QSO accretion disks are prone to selfgravity if heated solely by orbital dissipation. Such disks might be expected to form stars rather than accrete onto the black hole.
Ayal, Balbus, Balbus, Begelman, Bertin, Bertin, Bertin, Binney, Blandford, Brandenburg, Cameron, Cannizzo, Cao, Collin, Collin, Ebisuzaki, Evans, Galeev, Gammie, Gammie, Gebhardt, Greenhill, Greenhill, Hawley, Heyvaerts, Hills, Ichimaru, Illarionov, Jeremy Goodman, Kalnajs, Keady, Kumar, Kurucz, Lacy, Larson, Lee, Lightman, Lin, Lodato, Lynden-Bell, Maoz, Martin, Matsumoto, McLure, McMillan, Menou, Merloni, Merritt, Miller, Monaghan, Mukai, Nakai, Narayan, Neufeld, Ogilvie, Paczyński, Pariev, Pringle, Ramsay, Rees, Rees, Salpeter, Sanders, Sellwood, Shakura, Shapiro, Shlosman, Shlosman, Shu, Sirko, Spitzer, Spitzer, Stone, Zel'dovich   +73 more
core   +3 more sources

The chemical evolution of local star forming galaxies: Radial profiles of ISM metallicity, gas mass, and stellar mass and constraints on galactic accretion and winds

, 2015
The radially averaged metallicity distribution of the ISM and the young stellar population of a sample of 20 disk galaxies is investigated by means of an analytical chemical evolution model which assumes constant ratios of galactic wind mass loss and ...
Bresolin, Fabio, Burkert, Andreas, Dima, Gabriel I., Ho, I-Ting, Kudritzki, Rolf-Peter, Schruba, Andreas, Zahid, H. Jabran   +6 more
core   +1 more source

Observations of T Tauri Disks at Sub-AU Radii: Implications for Magnetospheric Accretion and Planet Formation [PDF]

, 2005
We determine inner disk sizes and temperatures for four solar-type (1-2 M$_{\odot}$) classical T Tauri stars (AS 207A, V2508 Oph, AS 205A, and PX Vul) using 2.2 $\mu$m observations from the Keck Interferometer.
A. I. Sargent, Baraffe I., Chini R., Dutrey A., D’Antona F., J. A. Eisner, Johns-Krull C. M., L. A. Hillenbrand, Lynden-Bell D., Piorno Schiavon R., R. J. White, R. L. Akeson, Reipurth B., Siess L.   +13 more
core   +2 more sources

Inconsistency in the standard model for stellar thin accretion disks [PDF]

Physical Review D, 2012
We analyze the configuration of a thin rotating accretion disk, which is embedded in a magnetic field inducing a backreaction in the gravitating plasma. The aim of this study is to determine the conditions under which the gaseous accretion model of Shakura can be reconciled with the magnetohydrodynamical picture requested to trigger the underlying ...
Giovanni Montani, Nakia Carlevaro
openaire   +1 more source

Ionization and heating by X-rays and cosmic rays*

EPJ Web of Conferences, 2015
High-energy radiation from the central T Tauri and protostars plays an important role in shaping protoplanetary disks and influences their evolution. Such radiation, in particular X-rays and extreme-ultraviolet (EUV) radiation, is predominantly generated
Güdel Manuel
doaj   +1 more source

On rapid migration and accretion within disks around supermassive black holes

, 2011
Galactic nuclei should contain a cluster of stars and compact objects in the vicinity of the central supermassive black hole due to stellar evolution, minor mergers and gravitational dynamical friction.
Alexander, Armitage, Artymowicz, B. McKernan, Baruteau, Chang, Collin, Cordes, Crummy, Gierliński, Goodman, H. B. Perets, Ho, K. E. S. Ford, Kauffmann, Kormendy, Krolik, L. M. Winter, Levin, Lodato, Lyra, Masset, McKernan, McKernan, McKernan, Merritt, Miralda Escudé, Miralda Escudé, Morris, Nayakshin, Nelson, Noble, Ostriker, Paardekooper, Pepliński, Pepliński, Perets, Pier, Rauch, Remillard, Schödel, Shakura, Shlosman, Sirko, Subr, Syer, T. Yaqoob, Toropina, Vilkoviskij, W. Lyra, Winter   +50 more
core   +1 more source