Collapse of Molecular Cloud Cores with Radiation Transfer: Formation of Massive Stars by Accretion

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

3

Accretion, Accretion Disks, Dust, Extinction, Infrared: Stars, Radiative Transfer, Stars: Formation, Stars: Luminosity Function, Mass Function, Stars: Pre-Main Sequence

Scientific paper

Most early radiative transfer calculations of protostellar collapse have suggested an upper limit of ~40 M sun for the final stellar mass before radiation pressure can exceed the star's gravitational pull and halt the accretion. Here we perform further collapse calculations, using frequency-dependent radiation transfer coupled to a frequency-dependent dust model that includes amorphous carbon particles, silicates, and ice-coated silicates. The models start from pressure-bounded, logatropic spheres of mass between 5 M sun and 150 M sun with an initial nonsingular density profile. We find that in a logatrope the infall is never reversed by the radiative forces on the dust and that stars with masses gsim100 M sun may form by continued accretion. Compared to previous models that start the collapse with a ρ vprop r -2 density configuration, our calculations result in higher accretion times and lower average accretion rates with peak values of ~5.8 × 10-5 M sun yr-1. The radii and bolometric luminosities of the produced massive stars (gsim90 M sun) are in good agreement with the figures reported for detected stars with initial masses in excess of 100 M sun. The spectral energy distribution from the stellar photosphere reproduces the observed fluxes for hot molecular cores with peaks of emission from mid- to near-infrared.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Collapse of Molecular Cloud Cores with Radiation Transfer: Formation of Massive Stars by Accretion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Collapse of Molecular Cloud Cores with Radiation Transfer: Formation of Massive Stars by Accretion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collapse of Molecular Cloud Cores with Radiation Transfer: Formation of Massive Stars by Accretion will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1882567

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.