J/ApJ/943/147 Ap stars from LAMOST DR9 sp. and Gaia DR3 (Shi+, 2023)
An Ap star catalog based on LAMOST DR9.
Shi F., Zhang H., Fu J., Kurtz D., Xiang M.
<Astrophys. J., 943, 147 (2023)>
=2023ApJ...943..147S 2023ApJ...943..147S
ADC_Keywords: Stars, Ap; Spectra, optical; Spectral types; Magnitudes, absolute;
Colors
Keywords: Chemically peculiar stars ; Ap stars ; Chemical abundances ;
Astronomy data analysis ; Variable stars
Abstract:
We present a sample of 2700 Ap stars in the Large Sky Area
Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR9 catalog. The
candidates are first selected to be in a temperature range typical of
Ap stars by using the BP-RP color index from Gaia DR3. Then the
5200Å flux depression features characteristic of Ap stars are
visually checked in LAMOST DR9 spectra. The detailed spectral features
are given by applying a modified spectral classification program,
MKCLASS. The stellar parameters of these Ap stars, such as the Teff,
logg, [Fe/H], [Si/H], and vsini, are either extracted from a hot star
catalog or derived through empirical relations and then a statistical
analysis is carried out. The evolutionary stages are also discussed.
Finally, we discuss the rotation and pulsation features of those that
have TESS or Kepler light curves. Among these Ap stars, we find seven
new rotation variables, one new roAp star, and a new δ Scuti
pulsation of a previously known roAp star.
Description:
LAMOST is an optical spectral telescope located in Xinglong Station of
the National Astronomical Observatory, China. The telescope is
designed with a 20deg2 field of view and up to a 4.9m effective
aperture so that it is able to obtain spectra for 4000 targets with
magnitude brighter than r=19 at a resolution R∼1800 at one time in
low-resolution mode. Up to DR9, LAMOST has obtained 11,791,589 spectra
approximately covering a wavelength range of 3700-9000Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 290 2700 The Ap star catalog
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
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)
J/A+AS/128/573 : ubvyΔa photometry of Renson stars (Maitzen+ 1998)
J/A+A/455/303 : Nainital-Cape Survey. II. Null results (Joshi+, 2006)
J/MNRAS/460/1912 : The Catalog of HgMn Stars (Ghazaryan+, 2016)
J/AJ/151/13 : LAMOST-Kepler MKCLASS spectral classification (Gray+, 2016)
J/A+A/601/A14 : Radial velocities of magnetic Ap stars (Mathys, 2017)
J/MNRAS/466/546 : Parameters for the 172 λ Boo stars (Murphy+, 2017)
J/ApJ/873/L5 : Magnetic fields of Ap/Bp stars (Chojnowski+, 2019)
J/MNRAS/487/5922 : CP stars catalog (roAp, He-weak, He-rich) (Ghazaryan+, 2019)
J/ApJS/242/13 : Am stars from LAMOST DR5 (Qin+, 2019)
J/A+A/628/A81 : Gaia DR2-based catalogue of 237 Ap stars (Scholz+, 2019)
J/MNRAS/493/3293 : Rotational periods of magnetic CP stars (Bernhard+, 2020)
J/A+A/640/A40 : 1002 mCP stars from LAMOST DR4 (Hummerich+, 2020)
J/A+A/660/A70 : Long-period Ap stars with TESS data (Mathys+, 2022)
J/A+A/662/A66 : Hot stars from LAMOST DR6 (Xiang+, 2022)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 39 A39 --- SpecID LAMOST DR9 spectrum identifier
41- 45 I5 d LMJD [55875/59283] Local Modified Julian Day
47- 55 I9 --- ObsID [2416019/898308059] LAMOST DR9 Observation
identifier
57- 62 F6.2 deg RAdeg Right Ascension (J2000)
64- 68 F5.2 deg DEdeg [-9/72] Declination (J2000)
70- 75 F6.2 --- SNRg [50/999] Signal-to-Noise of Gaia DR3 G band
magnitude
77- 81 F5.2 mag GMag [5.2/20.3] Absolute Gaia DR3 G band
magnitude (1)
83- 87 F5.2 mag G0mag [-5/11.4]? De-reddened Gaia DR3 G band
magnitude
89- 93 F5.2 mag (BP-RP) [-0.2/1.6] Gaia DR3 (Blue-Red) passband color
95- 99 F5.2 mag (BP-RP)0 [-1.8/0.71]? De-reddened Gaia DR3 (Blue-Red)
passband color
101- 104 F4.2 mag a [0.5/0.61] The a index value (2)
106- 112 F7.2 pc Dist [77/9574]? Distance from
Bailer-Jones+ 2021, I/352
114- 173 A60 --- liblamost Spectral classification from liblamost
library
175- 234 A60 --- libnor36 Spectral classification from libnor36 library
236- 270 A35 --- Note Rotation and pulsation feature notes; if
available
272- 290 I19 --- GaiaDR3 Gaia DR3 identifier
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Note (1): Estimated from Gaia DR3 apparent G magnitude and distance.
Note (2): In this system, two intermediate band filters (g1 at 5020 Angstroms
and g2 at 5240 Angstroms) are used along with the Stromgren y filter.
The flux at g2 is compared with that at g1 and y.
The a index is: a=g2-(g1+y)/2
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Dec-2024