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Title: A Comparative Observational Study of YSO Classification in Four Small Star-forming H ii Regions

Abstract

We have developed a new young stellar object (YSO) identification and classification technique using mid-infrared Wide-field Infrared Survey Explorer (WISE) data. We compare this new technique with previous WISE YSO detection and classification methods that used either infrared colors or spectral energy distribution slopes. In this study, we also use the new technique to detect and examine the YSO population associated with four small H ii regions: KR 7, KR 81, KR 120, and KR 140. The relatively simple structure of these regions allows us to effectively use both spatial and temporal constraints to identify YSOs that are potential products of triggered star formation. We are also able to identify regions of active star formation around these H ii regions that are clearly not influenced by the H ii region expansion, and thus demonstrate that star formation is on-going on megayear timescales in some of these molecular clouds.

Authors:
; ;  [1];  [2]
  1. Korea Astronomy and Space Science Institute, 776, Daedeokdae-ro, Yuseong-gu, Daejeon, 34055 (Korea, Republic of)
  2. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States)
Publication Date:
OSTI Identifier:
22663286
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 845; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLASSIFICATION; CLOUDS; COMPARATIVE EVALUATIONS; DETECTION; ENERGY SPECTRA; EXPANSION; HYDROGEN; INFRARED SURVEYS; STAR EVOLUTION; STARS

Citation Formats

Kang, Sung-Ju, Choi, Minho, Kang, Miju, and Kerton, C. R., E-mail: sjkang@kasi.re.kr, E-mail: kerton@iastate.edu. A Comparative Observational Study of YSO Classification in Four Small Star-forming H ii Regions. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7DA3.
Kang, Sung-Ju, Choi, Minho, Kang, Miju, & Kerton, C. R., E-mail: sjkang@kasi.re.kr, E-mail: kerton@iastate.edu. A Comparative Observational Study of YSO Classification in Four Small Star-forming H ii Regions. United States. doi:10.3847/1538-4357/AA7DA3.
Kang, Sung-Ju, Choi, Minho, Kang, Miju, and Kerton, C. R., E-mail: sjkang@kasi.re.kr, E-mail: kerton@iastate.edu. Thu . "A Comparative Observational Study of YSO Classification in Four Small Star-forming H ii Regions". United States. doi:10.3847/1538-4357/AA7DA3.
@article{osti_22663286,
title = {A Comparative Observational Study of YSO Classification in Four Small Star-forming H ii Regions},
author = {Kang, Sung-Ju and Choi, Minho and Kang, Miju and Kerton, C. R., E-mail: sjkang@kasi.re.kr, E-mail: kerton@iastate.edu},
abstractNote = {We have developed a new young stellar object (YSO) identification and classification technique using mid-infrared Wide-field Infrared Survey Explorer (WISE) data. We compare this new technique with previous WISE YSO detection and classification methods that used either infrared colors or spectral energy distribution slopes. In this study, we also use the new technique to detect and examine the YSO population associated with four small H ii regions: KR 7, KR 81, KR 120, and KR 140. The relatively simple structure of these regions allows us to effectively use both spatial and temporal constraints to identify YSOs that are potential products of triggered star formation. We are also able to identify regions of active star formation around these H ii regions that are clearly not influenced by the H ii region expansion, and thus demonstrate that star formation is on-going on megayear timescales in some of these molecular clouds.},
doi = {10.3847/1538-4357/AA7DA3},
journal = {Astrophysical Journal},
number = 1,
volume = 845,
place = {United States},
year = {Thu Aug 10 00:00:00 EDT 2017},
month = {Thu Aug 10 00:00:00 EDT 2017}
}