J/ApJS/275/24 The value-added cat. of OB stars in LAMOST DR7 (Liu+, 2024)
The value-added catalog of OB stars in LAMOST DR7.
Liu Z., Cui W., Gu J., Shi J., Hu G., Wang X.-L., Huo Z.
<Astrophys. J. Suppl. Ser., 275, 24 (2024)>
=2024ApJS..275...24L 2024ApJS..275...24L
ADC_Keywords: Stars, OB; Spectra, optical; Spectral types; Surveys;
Parallaxes, trigonometric
Keywords: Early-type stars ; Early-type emission stars ; Be stars ; Catalogs
Abstract:
In this work, we update the catalog of OB stars based on the Large Sky
Area Multi-Object Fiber Spectroscopic Telescope data release 7 and
modify the OB stars' selection criteria in spectral line indices'
space. The new catalog includes 37,778 spectra of 27,643 OB stars, of
which 3827 OB stars are newly identified. The spectral subclasses of
27,643 OB stars are obtained using the automatic classification code
MKCLASS. We find that the modified OB star selection criteria can
better improve the completeness of late B-type stars by analyzing
their spectral classification results given by MKCLASS. We also
identify 3006 Be-type stars or candidates by examining the Balmer
lines in their spectra and find that the frequency of our Be-type
stars (10.9%) is consistent with previous results. The spatial
distribution of OB stars indicates that they are mainly located in the
Galactic disk. This new catalog of OB stars will provide valuable data
for studying the structure and evolution of the Milky Way.
Description:
LAMOST is a 4m, quasi-meridian, reflecting Schmidt telescope, which
includes 4000 fibers in a field of view of 20deg2 in the sky. LAMOST
DR7 has collected more than 10 million low-resolution spectra with a
wavelength range from 3690 to 9100Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 154 37778 Information for 37,778 spectra of 27,643 OB stars
identified in this work
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See also:
III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)
III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
V/162 : LAMOST DR11 catalogs (Luo+, 2026)
J/A+AS/96/269 : Stellar Models from 0.8 to 120 Msolar (Schaller+, 1992)
J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)
J/AJ/122/248 : h and chi Per UBVI,Hα photometry (Keller+, 2001)
J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005)
J/A+A/457/265 : The VLT-FLAMES Survey of Massive Stars (Dufton+, 2006)
J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006)
J/A+A/472/577 : NGC 330 Be stars and binaries (Martayan+, 2007)
J/A+A/496/841 : VLT-FLAMES survey of massive stars (Hunter+, 2009)
J/A+A/530/A108 : VLT-FLAMES Tarantula Survey (Evans+, 2011)
J/A+A/537/A146 : Stellar models with rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)
J/A+A/539/A143 : Nearby B-stars stellar param. and abundances (Nieva+, 2012)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)
J/ApJS/224/4 : GOSSS III. Additional O-type systems (Maiz Apellaniz+, 2016)
J/AJ/155/91 : Be stars in open clusters with PTF/iPTF. I. (Yu+, 2018)
J/MNRAS/487/1400 : Spiral structure as revealed by O and B stars (Chen+, 2019)
J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019)
J/ApJ/886/27 : SNe IIP progenitors. I. LMC giant comparison (Wagle+, 2019)
J/ApJS/246/9 : Stellar parameters of LAMOST stars using SLAM (Zhang+, 2020)
J/ApJS/253/54 : Galactic O-type stars from LAMOST spectra (Li, 2021)
J/A+A/645/L8 : Plx & proper motions of OB stars from Gaia EDR3 (Xu+, 2021)
J/A+A/650/A112 : Mapping hot luminous stars in the Galaxy (Zari+, 2021)
J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)
J/A+A/662/A66 : Hot stars from LAMOST DR6 (Xiang+, 2022)
J/A+A/674/A212 : Sp. sample of Galactic O9-B9 SGs (de Burgos+, 2023)
J/A+A/687/A228 : Luminous blue stars sp. analysis (de Burgos+, 2024)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- Obsid [215136/746914117] LAMOST DR7 observation
identifier
11- 29 A19 --- LAMOST LAMOST DR7 designation (JHHMMSS.ss+DDMMSS.s)
31- 36 F6.2 --- S/N [15/999] Signal-to-Noise in the g band
38- 61 A24 --- MKSpT MK classification
63- 79 A17 --- SSpT Simbad classification
81- 92 A12 --- SpT Manual classification (1)
94-112 I19 --- Gaia ? Gaia EDR3 identifier
114-120 F7.4 mas plx [0.0007/22.2]? Gaia EDR3 parallax
122-127 F6.4 mas e_plx [0.008/1.7]? Uncertainty in plx
129-136 F8.2 pc Dist [85.4/27124]? Distance (2)
138-145 F8.2 pc E_Dist [0.2/16441]? Upper uncertainty in Dist
147-154 F8.2 pc e_Dist [0.17/11412]? Lower uncertainty in Dist
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Note (1): The spectral type (O or B) identified by eye in this work.
Note (2): The distances of OB stars are from Bailer-Jones+ (2021, I/352).
All other distances from Gaia EDR3.
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History:
From electronic version of the journal
References:
Liu et al. Paper I. 2019ApJS..241...32L 2019ApJS..241...32L Cat. J/ApJS/241/32
Licences: cc-by
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Sep-2025