A radiation driven implosion model for the enhanced luminosity of protostars near HII regions

Abstract

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 fluxes. Methods. We performed numerical simulations to model collapse of cores exposed to UV radiation from O stars. We investigated dependence of mass loss rates on the initial density profiles of cores and variation of UV fluxes. We derived simple analytic estimates of accretion rates and final masses of protostars. Results. Radiation-driven implosion mechanism can increase accretion rates of protostars by 1-2 orders of magnitude. On the other hand, mass loss due to photo-evaporation is not large enough to have a significant impact on the luminosity. The increase of accretion rate makes luminosity 1-2 orders higher than those of protostars that form without external triggering. Conclusions. Radiation-driven implosion can help explain the observed higher luminosity of protostars in molecular clouds near H II regions.

9 pages, 6 figures, accepted for publication in Astronomy and Astrophysics

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• The statistics of triggered star formation: an overdensity of massive YSOs around Spitzer bubbles
• New Panoramic View of ${}^{12}$CO and 1.1 mm Continuum Emission in the Orion A Molecular Cloud. I. Survey Overview and Possible External Triggers of Star Formation
• Sequential star formation in a cometary globule (BRC37) of IC1396
• Protoplanetary Disk Evolution around the Triggered Star Forming Region Cepheus B
• On the evolution of gas clouds exposed to AGN radiation. I. Three-dimensional radiation hydrodynamic simulations
• An Infrared Census of Star Formation in the Horsehead Nebula
• Magnetic fields in multiple bright-rimmed clouds in different directions of H II region IC1396 - II
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ($\sim 1500$ ${\mathrm{M}}_{\odot }$) clump
• Debris Disks of Members of the Blanco 1 Open Cluster
• The effect of recombination radiation on the temperature and ionization state of partially ionized gas
• Effects of Magnetic Field and FUV Radiation on the Structures of Bright-rimmed Clouds
• The Distribution of Dense Cores near HII Regions