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- W1583601313 abstract "We present spectroscopy from 2.0 to 2.33 μm of 32 luminous young stellar objects (YSOs), which are presumed to be precursors of Herbig Ae/Be stars. From these stars, Brγ, H2, CO, He I, and Fe II were found in emission with detection rates of 97%, 34%, 22%, 9%, and 3%, respectively. We compare the spectral features with those of Herbig Ae/Be stars in the literature to investigate the spectral behavior of intermediate- to high-mass YSOs and to search for their relations to the spectral energy distributions (SEDs). H2 emission is detected only in Class I SEDs with particularly large spectral indices. The detection of H2 emission is related to the degree of the dispersal of circumstellar envelopes, where H2 molecules are probably excited by shocks from outflows. On the other hand, Brγ emission, which is generally thought to occur in stellar winds close to the stars, does not depend on the SEDs. This indicates that stellar wind from luminous YSOs does not change much from the embedded phase to the optically visible phase. CO emission is also independent of the SEDs, but the detection rate is much lower than that of Brγ emission. Probably, more specific physical conditions regarding circumstellar disks and stellar radiation are necessary for CO emission to take place." @default.
- W1583601313 created "2016-06-24" @default.
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- W1583601313 date "2001-06-01" @default.
- W1583601313 modified "2023-09-30" @default.
- W1583601313 title "[ITAL]K[/ITAL]-Band Spectroscopy of Luminous Young Stellar Objects" @default.
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- W1583601313 doi "https://doi.org/10.1086/321090" @default.
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