首页|Spectroscopic Study of Late-type Emission-line Stars Using the Data from LAMOST DR6

Spectroscopic Study of Late-type Emission-line Stars Using the Data from LAMOST DR6

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Low-mass emission-line stars belong to various evolutionary stages,from pre-main-sequence young stars to evolved stars.In this work,we present a catalog of late-type(F0 to M9)emission-line stars from the LAMOST Data Release 6.Using the scipy package,we created a Python code that finds the emission peak at Hα in all late-type stellar spectra.A data set of 38,152 late-type emission-line stars was obtained after a rigorous examination of the photometric quality flags and the signal-to-noise ratio of the spectra.Adopting well-known photometric and spectroscopic methods,we classified our sample into 438 infrared(IR)excess sources,4669 post-main-sequence candidates,9718 Fe/Ge/Ke sources,and 23,264 dMe sources.From a crossmatch with known databases,we found that 29,222 sources,comprising 65 IR excess sources,7899 Fe/Ge/Ke stars,17,533 dMe stars,and 3725 PtMS candidates,are new detections.We measured the equivalent width of the major emission lines observed in the spectra of our sample of emission-line stars.Furthermore,the trend observed in the line strengths of major emission lines over the entire late-type spectral range is analyzed.We further classified the sample into four groups based on the presence of hydrogen and calcium emission lines.This work presents a large data set of late-type emission-line stars,which can be used to study active phenomena in late-type stars.

Stars:late-typeStars:activityLine:identification

D.Edwin、Blesson Mathew、B.Shridharan、Vineeth Valsan、S.Nidhi、Suman Bhattacharyya、Sreeja S.Kartha、T.Robin

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Department of Physics and Electronics,CHRIST(Deemed to be University),Hosur Main Road,Bangalore,560029,India

Department of Astronomy and Astrophysics,Tata Institute of Fundamental Research,Mumbai,400005,India

The Oxford College of Science,17th,32,19th Main road,Sector 4,HSR Layout,Bengaluru,Karnataka,560102,India

2024

10.1088/1674-4527/ad8f9b

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(12)