Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-11-22
The Astrophysical Journal Letters, Volume 725, Number 2, pp. L239-L244 (2010)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
15 pages, 5 figures, Accepted for publication in ApJL
Scientific paper
10.1088/2041-8205/725/2/L239
A first adiabatic core is a transient object formed in the early phase of star formation. The observation of a first core is believed to be difficult because of its short lifetime and low luminosity. On the basis of radiation hydrodynamic simulations, we propose a novel theoretical model of first cores, Exposed Long-lifetime First core (ELF). In the very low-mass molecular core, the first core evolves slowly and lives longer than 10,000 years because the accretion rate is considerably low. The evolution of ELFs is different from that of ordinary first cores because radiation cooling has a significant effect there. We also carry out radiation transfer calculation of dust-continuum emission from ELFs to predict their observational properties. ELFs have slightly fainter but similar SEDs to ordinary first cores in radio wavelengths, therefore they can be observed. Although the probabilities that such low mass cores become gravitationally unstable and start to collapse are low, we still can expect that a considerable number of ELFs can be formed because there are many low-mass molecular cloud cores in star-forming regions that can be progenitors of ELFs.
Machida Masahiro N.
Matsumoto Tomoaki
Saigo Kazuya
Tomida Kengo
Tomisaka Kohji
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