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The First Extensive Spectroscopic Study of Young Stars in the North America and Pelican Nebulae Region

Fang, Min and Hillenbrand, Lynne A. and Kim, Jinyoung Serena and Findeisen, Krzysztof and Herczeg, Gregory J. and Carpenter, John M. and Rebull, Luisa M. and Wang, Hongchi (2020) The First Extensive Spectroscopic Study of Young Stars in the North America and Pelican Nebulae Region. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20201009-093746303

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Abstract

We present a spectroscopic survey of over 3400 potential members in the North America and Pelican nebulae (NAP) using several low-resolution (R≈ 1300-2000) spectrographs: Palomar/Norris, WIYN/HYDRA, Keck/DEIMOS, and MMT/Hectospec. We identify 580 young stars as likely members of the NAP region based on criteria involving infrared excess, Li I 6708 absorption, X-ray emission, parallax, and proper motions. The spectral types of individual spectra are derived by fitting them with templates that are either empirical spectra of pre-main sequence stars, or model atmospheres. The templates are artificially veiled, and a best-fit combination of spectral type and veiling parameter is derived for each star. We use the spectral types with archival photometry to derive V-band extinction and stellar luminosity. From the H-R diagram, the median age of the young stars is about 1 Myr, with a luminosity dispersion of ∼0.3--0.4 dex. We investigate the photometric variability of the spectroscopic member sample using ZTF data, and conclude that photometric variability, while present, does not significantly contribute to the luminosity dispersion. While larger than the formal errors, the luminosity dispersion is smaller than if veiling were not taken into account in our spectral typing process. The measured ages of stellar kinematic groups, combined with inferred ages for embedded stellar populations revealed by Spitzer, suggests a sequential history of star formation in the NAP region.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2009.11995v1arXivDiscussion Paper
ORCID:
AuthorORCID
Fang, Min0000-0001-8060-1321
Herczeg, Gregory J.0000-0002-7154-6065
Carpenter, John M.0000-0003-2251-0602
Rebull, Luisa M.0000-0001-6381-515X
Additional Information:Many thanks to the anonymous referee for comments that help to improve this paper. We thank Michael A. Kuhn for discussions about the NAP region. We recognize the contributions of former Caltech SURF students Daniel DeFelippis and Danika Wellington to our efforts. This paper uses data products produced by the OIR Telescope Data Center, supported by the Smithsonian Astrophysical Observatory. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. We use ZTF data, enabled by support from the NSF under grant AST-1440341, Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley national Laboratories. Facilities: Palomar:P200 (Norris), Keck:I (DEIMOS), MMT (Hectospec), Palomar:P48 (ZTF).
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility
Funders:
Funding AgencyGrant Number
Smithsonian Astrophysical ObservatoryUNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
NSFAST-1440341
ZTF partner institutionsUNSPECIFIED
Subject Keywords:accretion, accretion disks — planetary systems: protoplanetary disks — stars: pre-main sequence
Record Number:CaltechAUTHORS:20201009-093746303
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201009-093746303
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105947
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Oct 2020 17:05
Last Modified:09 Oct 2020 17:05

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