Results 11 to 20 of about 91,199 (294)

MHD simulations of accretion onto a dipolar magnetosphere. II. Magnetospheric ejections and stellar spin-down [PDF]

, 2012
This paper examines the outflows associated with the interaction of a stellar magnetosphere with an accretion disk. In particular, we investigate the magnetospheric ejections (MEs) due to the expansion and reconnection of the field lines connecting the ...
Ferreira, Jonathan, Zanni, Claudio
core   +2 more sources

Simulations of Accretion Powered Supernovae in the Progenitors of Gamma Ray Bursts [PDF]

, 2012
Observational evidence suggests a link between long duration gamma ray bursts (LGRBs) and Type Ic supernovae. Here, we propose a potential mechanism for Type Ic supernovae in LGRB progenitors powered solely by accretion energy.
Arnett, Balbus, Beloborodov, Beloborodov, Binney, Bisnovatyi-Kogan, Bisnovatyi-Kogan, Bloom, Burrows, Calder, Chen, Chieffi, Chornock, Christodoulou, Christopher C. Lindner, Cobb, Dessart, Di Matteo, Fryer, Fryxell, Fujimoto, Galama, Garnavich, Hamuy, Heger, Hjorth, Igumenshchev, Igumenshchev, Igumenshchev, Joggerst, Kasen, Kawabata, Khokhlov, Kohri, Kuhfuß, Landau, Lazzati, Lazzati, Lee, Limongi, Lindner, López-Cámara, López-Cámara, MacFadyen, MacFadyen, Malesani, Marek, Matheson, Mazzali, Mazzali, McKinney, Mezzacappa, Milosavljević, Miloš Milosavljević, Mirabal, Modjaz, Morsony, Morsony, Murphy, Murphy, Nagakura, Nagakura, Nagataki, Nordhaus, Nousek, O'Brien, O'Connor, Paczyński, Pawan Kumar, Perna, Podsiadlowski, Popham, Pruet, Pruet, Raskin, Reichart, Rongfeng Shen, Seitenzahl, Sekiguchi, Shakura, Soderberg, Stanek, Surman, Thompson, Thompson, Timmes, Wheeler, Woosley, Young, Zhang, Zimmerman   +90 more
core   +2 more sources

PROBING STELLAR ACCRETION WITH MID-INFRARED HYDROGEN LINES

The Astrophysical Journal, 2015
In this paper we investigate the origin of the mid-infrared (IR) hydrogen recombination lines for a sample of 114 disks in different evolutionary stages (full, transitional and debris disks) collected from the {\it Spitzer} archive. We focus on the two brighter {H~{\sc i}} lines observed in the {\it Spitzer} spectra, the {H~{\sc i}}(7-6) at 12.37$ $m ...
Meijerink, R., Edwards, S., Ardila, D., Grady, C., Mendigutía, I., Montesinos, B., Mulders, G., Najita, J., Carpenter, J., Furlan, E., Gorti, U., Meijerink, R., Meyer, M., Rigliaco, Elisabetta, Pascucci, I., Najita, J., Carpenter, J., Furlan, E., Gorti, U., Meyer, M., Duchene, G., Edwards, S., Ardila, D., Grady, C., Mendigutía, I., Montesinos, B., Mulders, G., Rigliaco, Elisabetta, Pascucci, I., Duchene, G.   +29 more
openaire   +6 more sources

Infrared study of the eta Chamaeleontis cluster and the longevity of circumstellar discs [PDF]

, 2002
We have analyzed JHKL observations of the stellar population of the ~9 Myr-old eta Chamaeleontis cluster. Using infrared (IR) colour-colour and colour-excess diagrams, we find the fraction of stellar systems with near-IR excess emission is 0.60 pm 0.13 ...
A.-Ran Lyo, Alcalá, Balona, Barnes, Bessell, Bessell, Bouvier, Carter, Carter, Clarke, Clausen, Eon-Chang Sung, Eric D. Feigelson, Eric E. Mamajek, Feigelson, Greene, Haisch, Haisch, Hartmann, Hillenbrand, Hillenbrand, Hollenbach, Kenyon, Kenyon, Koornneef, Köhler, Lada, Lawson, Lawson, Lawson, Lawson, Lisa A. Crause, Mamajek, Mamajek, Mamajek, McGregor, Muzerolle, Rebull, Shu, Siess, Strom, Telesco, Tinker, Warrick A. Lawson, Westin, Wolk   +45 more
core   +2 more sources

Galactic Centre stellar winds and Sgr A* accretion [PDF]

Monthly Notices of the Royal Astronomical Society, 2006
(ABRIDGED) We present in detail our new 3D numerical models for the accretion of stellar winds on to Sgr A*. In our most sophisticated models, we put stars on realistic orbits around Sgr A*, include `slow' winds (300 km/s), and account for radiative cooling. We first model only one phase `fast' stellar winds (1000 km/s). For wind sources fixed in space,
Cuadra, J., Nayakshin, S., Springel, V., Di Matteo T.   +3 more
openaire   +4 more sources

ACCRETION ONTO THE FIRST STELLAR-MASS BLACK HOLES [PDF]

The Astrophysical Journal, 2009
4 pages, 4 figures, submitted to ApJ Letters, see http://slac.stanford.edu/~malvarez/FirstBH for high resolution figures and ...
Alvarez, Marcelo A., Wise, John H., Abel, Tom   +2 more
openaire   +3 more sources

Spectral variability of classical T Tauri stars accreting in an unstable regime [PDF]

, 2013
Classical T Tauri stars (CTTSs) are variable in different time-scales. One type of variability is possibly connected with the accretion of matter through the Rayleigh-Taylor instability that occurs at the interface between an accretion disc and a stellar
Kurosawa, Ryuichi, Romanova, Marina M.
core   +1 more source

Accretion in Young Stellar/Substellar Objects

The Astrophysical Journal, 2003
We present a study of accretion in a sample of 45 young, low mass objects in a variety of star forming regions and young associations, about half of which are likely substellar. Based primarily on the presence of broad, asymmetric Halpha emission, we have identified 13 objects (~30% of our sample) which are strong candidates for ongoing accretion.
Muzerolle, James, Hillenbrand, Lynne, Calvet, Nuria, Briceno, Cesar, Hartmann, Lee   +4 more
openaire   +2 more sources

MOLECULAR CLOUD EVOLUTION. III. ACCRETION VERSUS STELLAR FEEDBACK [PDF]

The Astrophysical Journal, 2010
We numerically investigate the effect of feedback from the ionizing radiation heating from massive stars on the evolution of giant molecular clouds (GMCs) and their star formation efficiency (SFE). We find that the star-forming regions within the GMCs are invariably formed by gravitational contraction.
Enrique Vázquez-Semadeni, Pedro Colín, Gilberto C. Gómez, Javier Ballesteros-Paredes, Alan W. Watson   +4 more
openaire   +2 more sources

Mapping accretion and its variability in the young open cluster NGC 2264: a study based on u-band photometry [PDF]

, 2014
We aim at characterizing the accretion properties of several hundred members of the star-forming cluster NGC 2264 (3 Myr). We performed a deep u,g,r,i mapping and a simultaneous u+r monitoring of the region with CFHT/MegaCam in order to directly probe ...
Alencar, Silvia H. P., Bouvier, Jérôme, Cody, Ann Marie, Cuillandre, Jean-Charles, Flaccomio, Ettore, Irwin, Jonathan, Micela, Giuseppina, Peres, Giovanni, Sousa, Alana P., Stauffer, John R., Teixeira, Paula S., Venuti, Laura   +11 more
core   +4 more sources