A Catalogue of OB Stars from LAMOST Spectroscopic Survey

Abstract

We present 22\,901 OB spectra of 16\,032 stars identified from LAMOST DR5 dataset. A larger sample of OB candidates are firstly selected from the distributions in the spectral line indices space. Then all 22\,901 OB spectra are identified by manual inspection. Based on a sub-sample validation, we find that the completeness of the OB spectra reaches about $89\pm 22$\% for the stars with spectral type earlier than B7, while around $57\pm 16$\% B8--B9 stars are identified. The smaller completeness for late B stars is lead to the difficulty to discriminate them from A0--A1 type stars. The sub-classes of the OB samples are determined using the software package MKCLASS. With a careful validation using 646 sub-samples, we find that MKCLASS can give fairly reliable sub-types and luminosity class for most of the OB stars. The uncertainty of the spectral sub-type is around 1 sub-type and the uncertainty of the luminosity class is around 1 level. However, about 40\% of the OB stars are failed to be assigned to any class by MKCLASS and a few spectra are significantly misclassified by MKCLASS. This is likely because that the template spectra of MKCLASS are selected from nearby stars in the solar neighborhood, while the OB stars in this work are mostly located in the outer disk and may have lower metallicity. The rotation of the OB stars may also be responsible for the mis-classifications. Moreover, we find that the spectral and luminosity classes of the OB stars located in the Galactic latitude larger than 20${}^{\circ }$ are substantially different with those located in latitude smaller than 20${}^{\circ }$, which may either due to the observational selection effect or hint a different origin of the high Galactic latitude OB stars.

arXiv comment17 pages, 18 figures, Accepted for publication in ApJS

References in corpus (41)

• Gaia Data Release 2. Summary of the contents and survey properties
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• Progenitors of core-collapse supernovae
• Physical Properties of Wolf-Rayet Stars
• Pre-Supernova Evolution of Massive Single and Binary Stars
• The High Angular Resolution Multiplicity of Massive Stars
• LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
• The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
• The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
• The Supernova Channel of Super-AGB Stars
• Rotational mixing in massive binaries: detached short-period systems
• The VLT-FLAMES survey of massive stars: rotation and nitrogen enrichment as the key to understanding massive star evolution
• The spinning-top Be star Achernar from VLTI-VINCI
• Galactic Metallicity Gradients Derived from a Sample of OB Stars
• The VLT-FLAMES Survey of Massive Stars: Observations in the Galactic Clusters NGC 3293, NGC 4755 and NGC 6611
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• LAMOST observations in the Kepler field. Database of low-resolution spectra
• Binary progenitor models of type IIb supernovae
• Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
• The population of OB supergiants in the starburst cluster Westerlund 1
• Evolution of surface CNO abundances in massive stars
• The K giant stars from the LAMOST survey data I: identification, metallicity, and distance
• A comparison of the local spiral structure from Gaia DR2 and VLBI maser parallaxes
• Carbon stars identified from LAMOST DR4 using Machine Learning
• A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
• Mapping the Milky Way with LAMOST I: Method and overview
• Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
• Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621
• The edge of the young Galactic disc
• Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants
• Carbon stars from LAMOST DR2 data
• Interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
• The Origins and Evolutionary Status of B Stars Found Far From the Galactic Plane I: Composition and Spectral Features
• Flux rope proxies and fan-spine structures in active region NOAA 11897
• A study of the effect of rotational mixing on massive stars evolution: surface abundances of Galactic O7-8 giant stars
• Red Clump Stars from the LAMOST data I: identification and distance
• Mira Variable Stars From LAMOST DR4 Data: Emission Features, Temperature Types, and Candidate Selection
• Massive stars in the SDSS-IV/APOGEE SURVEY. I- OB stars
• Galactic structure in the outer disk: the field in the line of sight to the intermediate-age open cluster Tombaugh 1

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