A LAMOST Spectroscopic Study of T Tauri Stars in the Orion OB1a Subassociation

A LAMOST Spectroscopic Study of T Tauri Stars in the Orion OB1a Subassociation

Abstract We present a spectroscopic analysis of T Tauri stars (TTSs) observed with the wide-field multifiber spectrograph LAMOST in the substellar associations Ori OB1a located in the Orion Star-forming Complex. Based on GAIA-DR3 data, we selected stars with proper motions and parallaxes expected fo...

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Bibliographic Details
Published in:The Astronomical journal Vol. 165; no. 5; pp. 205 - 227
Main Authors: Hernández, Jesús, Zamudio, Luisa F., Briceño, César, Calvet, Nuria, Zhu, Zhaohuan, Yuan, Haibo, Liu, Xiaowei, Manzo-Martínez, Ezequiel, Román-Zúñiga, Carlos G., Serna, Javier, Maucó, Karina, Adame, Lucía
Format: Journal Article
Language:English
Published: Madison The American Astronomical Society 01-05-2023
IOP Publishing
Subjects:
Astronomy
Deposition
Hertzsprung Russell diagram
Kinematics
OB associations
Pre-main sequence
Proper motion
Protoplanetary disks
Spectroscopic analysis
Star formation
Star forming regions
Stars
Stellar kinematics
Stellar motions
Stellar spectral types
T Tauri stars
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Summary:Abstract We present a spectroscopic analysis of T Tauri stars (TTSs) observed with the wide-field multifiber spectrograph LAMOST in the substellar associations Ori OB1a located in the Orion Star-forming Complex. Based on GAIA-DR3 data, we selected stars with proper motions and parallaxes expected for TTSs belonging to the young association. We perform a spectroscopic analysis to obtain the spectral types and measure the equivalent widths of Li i and H α to confirm the youth of the stars and estimate the accretion status. We also estimate extinctions, masses, and ages for the studied sample. Out of 342 TTSs with spectroscopic and kinematic properties indicating their membership of the subassociation, 2 are reported here for the first time. Finally, we detect four stellar kinematic groups located at different distances, two in the north fields and two in the south field. These groups also show different proper motions. This suggests that the star-forming scenario in this region is more complex than the traditional spatial-temporal scenario, in which a generation of stars triggers the formation of a new spatially differentiated generation of stars.
Bibliography:AAS43307
Stars and Stellar Physics
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/acc467