Results 81 to 90 of about 24,969 (196)

Mass and luminosity evolution of young stellar objects

, 2012
A model of protostar mass and luminosity evolution in clusters gives new estimates of cluster age, protostar birthrate, accretion rate and mean accretion time.
Allen, Allen, Bally, Baraffe, Beerer, Bonnell, Bressert, Briceño, Burkert, Cunningham, Da Rio, De Marchi, Dunham, Dunham, Enoch, Enoch, Evans, Gorlova, Gutermuth, Gutermuth, Harvey, Harvey, Hosokawa, Huff, Huff, Jørgensen, Kirk, Koenig, Krumholz, Kryukova, Lee, Li, Luhman, Luhman, Luhman, Masiunas, McKee, McKee, Muench, Myers, Myers, Myers, Myers, Myers, Nakamura, Offner, Offner, Palla, Peterson, Philip C. Myers, Pudritz, Ridge, Tan, Teixeira, Terebey, Wang, Winston, Winston, Wolk   +58 more
core   +1 more source

Disk Wind Feedback from High-mass Protostars. IV. Shock-ionized Jets

The Astrophysical Journal
Massive protostars launch accretion-powered, magnetically collimated outflows, which play crucial roles in the dynamics and diagnostics of the star formation process. Here we calculate the shock heating and resulting free–free radio emission in numerical
Emiko C. Gardiner, Jonathan C. Tan, Jan E. Staff, Jon P. Ramsey, Yichen Zhang, Kei E. I. Tanaka   +5 more
doaj   +1 more source

Spitzer Space Telescope Spectroscopy of Ices toward Low-Mass Embedded Protostars [PDF]

, 2004
Sensitive 5-38 μm Spitzer Space Telescope and ground-based 3-5 μm spectra of the embedded low-mass protostars B5 IRS1 and HH 46 IRS show deep ice absorption bands superposed on steeply rising mid-infrared continua.
Blake, Geoffrey A., Boogert, A. C. Adwin, Brooke, Timothy Y., Brown, Joanna, Morris, Patrick, Noriega-Crespo, Alberto, Padgett, Deborah L., Sargent, Anneila I., Stapelfeldt, Karl R.   +8 more
core   +1 more source

The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars

, 2008
Deuterated ions are abundant in cold (T=10 K), dense (n=10^5 cm^-3) regions, in which CO is frozen out onto dust grains. In such environments, the deuterium fractionation of such ions can exceed the elemental abundance ratio of D/H by a factor of 10^4 ...
Adams, Aikawa, Aikawa, Alves, André, André, Bacmann, Bergin, Bergin, Bernes, Bisschop, Boogert, Caselli, Caselli, Caselli, Caselli, Ceccarelli, Ceccarelli, Cernis, Crapsi, Crapsi, Dalgarno, Daniel, Enoch, Evans, Flower, Flower, Fontani, Fontani, Fred, Frerking, Froebrich, Froebrich, Fuller, Gerlich, Gueth, Hatchell, Hatchell, Herbig, J. Stutzki, Jørgensen, Kirk, Kramer, Kramer, Kwon, Lacy, Lada, Looney, Looney, M. C. Wiedner, M. Emprechtinger, Mardones, Mardones, Maret, Matthews, Millar, Myers, Myers, N. H. Volgenau, O'Linger, Oliveira, P. Caselli, Pagani, Parise, Pineda, Rawlings, Redman, Roberts, Roberts, Roberts, Saraceno, Schnee, Shu, Smith, Tafalla, Tafalla, Tafalla, Terebey, van der Tak, Velusamy, Visser, Volgenau, Ward-Thompson, Willacy, Wilson, Womack, Öberg   +86 more
core   +2 more sources

ngVLA Synthetic Observations of Ionized Gas in Massive Protostars

The Astrophysical Journal
Massive-star formation involves significant ionization in the innermost regions near the central object, such as gravitationally trapped H ii regions, jets, ionized disks, or winds. Resolved observations of the associated continuum and recombination line
Jesús M. Jáquez-Domínguez, Roberto Galván-Madrid, Alfonso Trejo-Cruz, Carlos Carrasco-González, Jacopo Fritz, Susana Lizano, Aina Palau, Andrés F. Izquierdo, Luis F. Rodríguez, Alice Pasetto, Stanley Kurtz, Thomas Peters, Eric F. Jiménez-Andrade, Luis A. Zapata   +13 more
doaj   +1 more source

A submillimetre survey of the kinematics of the Perseus molecular cloud - III. Clump kinematics

, 2010
We explore the kinematics of continuum clumps in the Perseus molecular cloud, derived from C18O J=3-2 data. Two populations are examined, identified using the automated algorithms CLFIND and GAUSSCLUMPS on existing SCUBA data.
Alves, André, Arquilla, Ballesteros-Paredes, Barranco, Bate, Belloche, Benson, Binney, Bonnell, Bontemps, Buckle, Buckle, Burkert, Caselli, Caselli, Clark, Curtis, Curtis, Curtis, Dib, Dib, Duquennoy, Elmegreen, Elmegreen, Emily I. Curtis, Enoch, Galli, Gammie, Goodman, Goodman, Goodwin, Goodwin, Goodwin, Hartmann, Hatchell, Hatchell, Hatchell, Jappsen, Jijina, John S. Richer, Jones, Kirk, Kirk, Klessen, Krumholz, Krumholz, Larson, Larson, Li, Lissauer, Mac Low, MacLaren, McKee, Motte, Mouschovias, Myers, Nakamura, Nakamura, Offner, Offner, Ohashi, Olmi, Padoan, Pineda, Pirogov, Redman, Rohlfs, Rosolowsky, Ruden, Schnee, Shu, Simon, Solomon, Spitzer, Stutzki, Swift, Tachihara, Tilley, Walmsley, Williams, Williams, Zuckerman   +82 more
core   +1 more source

Protostellar Disk Formation Regimes: Angular Momentum Conservation versus Magnetic Braking

The Astrophysical Journal Letters
Protostellar disks around young protostars exhibit diverse properties, with their radii ranging from less than ten to several hundred astronomical units.
Hsi-Wei Yen, Yueh-Ning Lee
doaj   +1 more source

Theory of Disk Accretion onto Magnetic Stars

EPJ Web of Conferences, 2014
Disk accretion onto magnetic stars occurs in a variety of systems, including accreting neutron stars (with both high and low magnetic fields), white dwarfs, and protostars.
Lai Dong
doaj   +1 more source

Episodic accretion, radiative feedback, and their role in low-mass star formation

, 2011
It is speculated that the accretion of material onto young protostars is episodic. We present a computational method to include the effects of episodic accretion in radiation hydrodynamic simulations of star formation.
Hubber, David, Stamatellos, Dimitris, Whitworth, Anthony   +2 more
core  

Strong irradiation of protostellar cores in Corona Australis

, 2012
The importance of the physical environment in the evolution of newly formed low-mass stars remains an open question. In particular, radiation from nearby more massive stars may affect both the physical and chemical structure of these kinds of young stars.
Jørgensen, J. K., Lindberg, J. E.
core   +1 more source