Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects

Michael A. Kuhn; Ramzi Saber; Matthew S. Povich; Rafael S. de Souza; Alberto Krone-Martins; Emille E.~O. Ishida; Catherine Zucker; Robert A. Benjamin; Lynne A. Hillenbrand; Alfred Castro-Ginard; Xingyu Zhou; COIN Collaboration

doi:10.3847/1538-3881/ac9314

Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects

Michael A. Kuhn, Ramzi Saber, Matthew S. Povich, Rafael S. de Souza, Alberto Krone-Martins, Emille E.~O. Ishida, Catherine Zucker, Robert A. Benjamin, Lynne A. Hillenbrand, Alfred Castro-Ginard, Xingyu Zhou, COIN Collaboration

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Abstract

Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such objects (∼120,000 candidates in the Galactic midplane). Many SPICY candidates are spatially clustered, but, perhaps surprisingly, approximately half the candidates appear spatially distributed. To better characterize this unexpected population and confirm its nature, we obtained Palomar/DBSP spectroscopy for 26 of the optically bright (G < 15 mag) “isolated” YSO candidates. We confirm the YSO classifications of all 26 sources based on their positions on the Hertzsprung-Russell diagram, H and Ca ii line emission from over half the sample, and robust detection of infrared excesses. This implies a contamination rate of

Original language	English
Article number	3
Pages (from-to)	1-16
Number of pages	16
Journal	The Astronomical Journal
Volume	165
Issue number	1
Early online date	2 Dec 2022
DOIs	https://doi.org/10.3847/1538-3881/ac9314
Publication status	Published - 31 Jan 2023

Keywords

Herbig Ae/Be stars
T Tauri stars
Spectroscopy
Star formation
Young stellar objects
723
1681
1558
1569
1834
Astrophysics - Astrophysics of Galaxies
Astrophysics - Solar and Stellar Astrophysics

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10.3847/1538-3881/ac9314

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© 2022. The Author(s). This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: Published by the American Astronomical Society. https://creativecommons.org/licenses/by/4.0/
Final published version, 1.99 MBLicence: CC BY

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Kuhn, M. A., Saber, R., Povich, M. S., de Souza, R. S., Krone-Martins, A., Ishida, E. E. O., Zucker, C., Benjamin, R. A., Hillenbrand, L. A., Castro-Ginard, A., Zhou, X., & Collaboration, COIN. (2023). Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects. The Astronomical Journal, 165(1), 1-16. Article 3. https://doi.org/10.3847/1538-3881/ac9314

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abstract = "Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such objects (∼120,000 candidates in the Galactic midplane). Many SPICY candidates are spatially clustered, but, perhaps surprisingly, approximately half the candidates appear spatially distributed. To better characterize this unexpected population and confirm its nature, we obtained Palomar/DBSP spectroscopy for 26 of the optically bright (G < 15 mag) “isolated” YSO candidates. We confirm the YSO classifications of all 26 sources based on their positions on the Hertzsprung-Russell diagram, H and Ca ii line emission from over half the sample, and robust detection of infrared excesses. This implies a contamination rate of ",

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AU - Kuhn, Michael A.

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AU - Povich, Matthew S.

AU - de Souza, Rafael S.

AU - Krone-Martins, Alberto

AU - Ishida, Emille E.~O.

AU - Zucker, Catherine

AU - Benjamin, Robert A.

AU - Hillenbrand, Lynne A.

AU - Castro-Ginard, Alfred

AU - Zhou, Xingyu

AU - Collaboration, COIN

N1 - © 2022. The Author(s). This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: Published by the American Astronomical Society. https://creativecommons.org/licenses/by/4.0/

PY - 2023/1/31

Y1 - 2023/1/31

N2 - Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such objects (∼120,000 candidates in the Galactic midplane). Many SPICY candidates are spatially clustered, but, perhaps surprisingly, approximately half the candidates appear spatially distributed. To better characterize this unexpected population and confirm its nature, we obtained Palomar/DBSP spectroscopy for 26 of the optically bright (G < 15 mag) “isolated” YSO candidates. We confirm the YSO classifications of all 26 sources based on their positions on the Hertzsprung-Russell diagram, H and Ca ii line emission from over half the sample, and robust detection of infrared excesses. This implies a contamination rate of

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Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects

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