Results 31 to 40 of about 22,763 (197)
Identification of A Collapsing Protostar [PDF]
Astrophysics and Space Science, 1994 The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc.
Neal J. Evans +3 more
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Protostar Formation in the Early Universe [PDF]
Science, 2008 The nature of the first generation of stars in the universe remains largely unknown. Observations imply the existence of massive primordial stars early in the history of the universe, and the standard theory for the growth of cosmic structure predicts that structures grow hierarchically through gravitational instability.
Yoshida, N., Omukai, K., Hernquist, L.
openaire +5 more sources
A radiation driven implosion model for the enhanced luminosity of protostars near HII regions [PDF]
, 2006 Context. Molecular clouds near the H II regions tend to harbor more luminous protostars. Aims. Our aim in this paper is to investigate whether or not radiation-driven implosion mechanism enhances luminosity of protostars near regions of high-ionizing ...
Belloche +30 more
core +3 more sources
Observational signatures of outbursting protostars – II. Exploring a wide range of eruptive protostars [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 MNRAS accepted, 8 pages, 9 ...
MacFarlane, Benjamin +7 more
openaire +2 more sources
On Solar Type Protostars [PDF]
International Astronomical Union Colloquium, 1980 The formation of a 1 M⊙ protostar in spherical symmetry has been followed in time dependent hydrodynamics with a detailed description of the equation of state and a careful treatment of radiative transport. The comparison of the dynamic evolution with observation is made in terms of the Hertzprung-Russell diagram.
Karl-Heinz A. Winkler, Michael J. Newman
openaire +2 more sources
The Mass Accretion Rate and Stellar Properties in Class I Protostars
The Astrophysical Journal, 2023 Stars collect most of their mass during the protostellar stage, yet the accretion luminosity and stellar parameters, which are needed to compute the mass accretion rate, are poorly constrained for the youngest sources.
Eleonora Fiorellino +7 more
doaj +1 more source
Molecular richness in protostars: Lessons learnt from spectral observations [PDF]
EPJ Web of Conferences, 2022 The gas associated with the early stages of star formation contains traces of a large variety of molecular species, many of which are organic in nature. Interestingly, we observe a substantial chemical diversity among protostars, with some objects being ...
López-Sepulcre Ana, Bouvier Mathilde
doaj +1 more source
Star Formation triggered by cloud-cloud collisions [PDF]
, 2015 We present the results of SPH simulations in which two clouds, each having mass $M_{_{\rm{o}}}\!=\!500\,{\rm M}_{_\odot}$ and radius $R_{_{\rm{o}}}\!=\!2\,{\rm pc}$, collide head-on at relative velocities of $\Delta v_{_{\rm{o}}} =2.4,\;2.8,\;3.2,\;3.6\;{
Balfour, S. K. +3 more
core +2 more sources
Pulsed accretion in a variable protostar [PDF]
Nature, 2013 Periodic increases in luminosity arising from variable accretion rates have been predicted for some close pre-main sequence binary stars as they grow from circumbinary disks. The phenomenon is known as "pulsed accretion" and can affect the orbital evolution and mass distribution of young binaries, as well as the potential for planet formation in the ...
Muzerolle, James +4 more
openaire +3 more sources
Variable Accretion Rates and Fluffy First Stars [PDF]
, 2012 We combine the output of hydrodynamical simulations of Population III star cluster formation with stellar evolution models, and calculate the evolution of protostars experiencing variable mass accretion rates due to interactions within a massive disk. We
Baraffe +43 more
core +1 more source