A survey of dust features in the 3 micron spectra of YSO candidates

Miki Ishii; Tetsuya Nagata; Shuji Sato; Makoto Watanabe; Yongqiang Yao; Terry Jay Jones

doi:10.1086/300467

A survey of dust features in the 3 micron spectra of YSO candidates

Miki Ishii, Tetsuya Nagata, Shuji Sato, Makoto Watanabe, Yongqiang Yao, Terry Jay Jones

Minnesota Institute for Astrophysics

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Abstract

We present the results of spectrophotometry from 1.3 to 4.2 μm of 45 IRAS sources in the list of Campbell, Persson, & Matthews that have been presumed to be luminous young stellar objects because of their infrared colors and large IRAS fluxes. About 70% of the objects show 3.1 μm H₂O ice absorption or 3.3 μm unidentified infrared emission, or both. Among those with 3.1 μm H₂O ice absorption, three objects seem to have a distinct absorption near 3.4 μm, and their absorption profiles are different than the optical depth profiles of young stellar objects in the literature. In the HKL two-color diagram, objects with ice absorption occupy the same region as previously known young stellar objects with the ice feature, and those with unidentified infrared emission overlap with Herbig Ae/Be stars. We interpret the distribution in the HKL two-color diagram as indicating the evolutionary sequence of intermediate-to high-mass young stars.

Original language	English (US)
Pages (from-to)	868-880
Number of pages	13
Journal	Astronomical Journal
Volume	116
Issue number	2
DOIs	https://doi.org/10.1086/300467
State	Published - Aug 1998

Keywords

Circumstellar matter - dust, extinction - stars
Pre-main-sequence

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title = "A survey of dust features in the 3 micron spectra of YSO candidates",

abstract = "We present the results of spectrophotometry from 1.3 to 4.2 μm of 45 IRAS sources in the list of Campbell, Persson, & Matthews that have been presumed to be luminous young stellar objects because of their infrared colors and large IRAS fluxes. About 70% of the objects show 3.1 μm H2O ice absorption or 3.3 μm unidentified infrared emission, or both. Among those with 3.1 μm H2O ice absorption, three objects seem to have a distinct absorption near 3.4 μm, and their absorption profiles are different than the optical depth profiles of young stellar objects in the literature. In the HKL two-color diagram, objects with ice absorption occupy the same region as previously known young stellar objects with the ice feature, and those with unidentified infrared emission overlap with Herbig Ae/Be stars. We interpret the distribution in the HKL two-color diagram as indicating the evolutionary sequence of intermediate-to high-mass young stars.",

keywords = "Circumstellar matter - dust, extinction - stars, Pre-main-sequence",

author = "Miki Ishii and Tetsuya Nagata and Shuji Sato and Makoto Watanabe and Yongqiang Yao and Jones, {Terry Jay}",

year = "1998",

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T1 - A survey of dust features in the 3 micron spectra of YSO candidates

AU - Ishii, Miki

AU - Nagata, Tetsuya

AU - Sato, Shuji

AU - Watanabe, Makoto

AU - Yao, Yongqiang

AU - Jones, Terry Jay

PY - 1998/8

Y1 - 1998/8

N2 - We present the results of spectrophotometry from 1.3 to 4.2 μm of 45 IRAS sources in the list of Campbell, Persson, & Matthews that have been presumed to be luminous young stellar objects because of their infrared colors and large IRAS fluxes. About 70% of the objects show 3.1 μm H2O ice absorption or 3.3 μm unidentified infrared emission, or both. Among those with 3.1 μm H2O ice absorption, three objects seem to have a distinct absorption near 3.4 μm, and their absorption profiles are different than the optical depth profiles of young stellar objects in the literature. In the HKL two-color diagram, objects with ice absorption occupy the same region as previously known young stellar objects with the ice feature, and those with unidentified infrared emission overlap with Herbig Ae/Be stars. We interpret the distribution in the HKL two-color diagram as indicating the evolutionary sequence of intermediate-to high-mass young stars.

AB - We present the results of spectrophotometry from 1.3 to 4.2 μm of 45 IRAS sources in the list of Campbell, Persson, & Matthews that have been presumed to be luminous young stellar objects because of their infrared colors and large IRAS fluxes. About 70% of the objects show 3.1 μm H2O ice absorption or 3.3 μm unidentified infrared emission, or both. Among those with 3.1 μm H2O ice absorption, three objects seem to have a distinct absorption near 3.4 μm, and their absorption profiles are different than the optical depth profiles of young stellar objects in the literature. In the HKL two-color diagram, objects with ice absorption occupy the same region as previously known young stellar objects with the ice feature, and those with unidentified infrared emission overlap with Herbig Ae/Be stars. We interpret the distribution in the HKL two-color diagram as indicating the evolutionary sequence of intermediate-to high-mass young stars.

KW - Circumstellar matter - dust, extinction - stars

KW - Pre-main-sequence

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DO - 10.1086/300467

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JF - Astronomical Journal

IS - 2

ER -

A survey of dust features in the 3 micron spectra of YSO candidates

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Keywords

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