| Title | AGB Interlopers in YSO Catalogs Hunted out by NEOWISE |
| Authors | Lee, Jeong-Eun Lee, Sieun Lee, Seonjae Suh, Kyung-Won Cho, Se-Hyung Byun, Do-Young Park, Wooseok Herczeg, Gregory Contreras Pena, Carlos Johnstone, Doug |
| Affiliation | Kyung Hee Univ, Sch Space Res, 1732 Deogyeong Daero, Yongin 17104, Gyeonggi Do, South Korea Seoul Natl Univ, Dept Phys & Astron, 1 Gwanak Ro, Seoul 08826, South Korea Chungbuk Natl Univ, Dept Astron & Space Sci, Cheongju 28644, South Korea Korea Astron & Space Sci Inst KASI, 776 Daedeokdae Ro, Daejeon 34055, South Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea Peking Univ, Kavli Inst Astron & Astrophys, Yiheyuan 5, Beijing 100871, Peoples R China Peking Univ, Dept Astron, Yiheyuan 5, Beijing 100871, Peoples R China Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England Univ Exeter, Sch Phys, Astrophys Grp, Stocker Rd, Exeter EX4 4QL, Devon, England NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada Univ Victoria, Dept Phys & Astron, 3800 Finnerty Rd,Elliot Bldg, Victoria, BC V8P 5C2, Canada |
| Keywords | SIO MASER SURVEY OH/IR STARS GIANT BRANCH IRAS SOURCES VARIABILITY EVOLUTION EMISSION OBJECTS |
| Issue Date | Aug-2021 |
| Publisher | ASTROPHYSICAL JOURNAL LETTERS |
| Abstract | Asymptotic giant branch stars (AGBs) and young stellar objects (YSOs) often share the same domains in infrared (IR) color-magnitude or color-color diagrams leading to potential misclassification. We extracted a list of AGB interlopers from the published YSO catalogs using the periodogram analysis on the Near-Earth Object Wide Infrared Survey Explorer (NEOWISE) time series data. YSO IR variability is typically stochastic and linked to episodic mass accretion. Furthermore, most variable YSOs are at an early evolutionary stage, with significant surrounding envelope and/or disk material. In contrast, AGBs are often identified by a well-defined sinusoidal variability with periods of a few hundreds days. From our periodogram analysis of all known low-mass YSOs in the Gould Belt, we find 85 AGB candidates, out of which 62 were previously classified as late-stage Class III YSOs. Most of these new AGB candidates have similar IR colors to O-rich AGBs. We observed 73 of these AGB candidates in the H2O, CH3OH, and SiO maser lines to further reveal their nature. The SiO maser emission was detected in 10 sources, confirming them as AGBs because low-mass YSOs, especially Class III YSOs, do not show such maser emission. The H2O and CH3OH maser lines were detected in none of our targets. |
| URI | http://hdl.handle.net/20.500.11897/619494 |
| ISSN | 2041-8205 |
| DOI | 10.3847/2041-8213/ac0d59 |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 物理学院 |
