J/ApJS/247/68 Probing the Gal. halo with RR Lyrae stars. I. (Liu+, 2020)
Probing the Galactic halo with RR Lyrae stars.
I. The catalog.
Liu G.-C., Huang Y., Zhang H.-W., Xiang M.-S., Ren J.-J., Chen B.-Q.,
Yuan H.-B., Wang C., Yang Y., Tian Z.-J., Wang F., Liu X.-W.
<Astrophys. J. Suppl. Ser., 247, 68 (2020)>
=2020ApJS..247...68L 2020ApJS..247...68L
ADC_Keywords: Stars, variable; Abundances, [Fe/H]; Radial velocities;
Stars, distances; Proper motions; Surveys; Magnitudes; Optical;
Milky Way
Keywords: RR Lyrae variable stars ; Galaxy abundances ; Chemical abundances ;
Galaxy structure ; Milky Way stellar halo
Abstract:
We present a catalog of 5290 RR Lyrae stars (RRLs) with metallicities
estimated from spectra of the LAMOST Experiment for Galactic
Understanding and Exploration (LEGUE) and the Sloan Extension for
Galactic Understanding and Exploration (SEGUE) surveys. Nearly 70% of
them (3642 objects) also have systemic radial velocities measured.
Given the pulsating nature of RRLs, metallicity estimates are based on
spectra of individual exposures that have been matched with their
synthetic templates. The systemic radial velocities are measured by
fitting the observed velocity as a function of phase assuming an
empirical pulsating velocity template curve. Various tests show that
our analyses yield metallicities with a typical precision of 0.20dex
and systemic radial velocities with uncertainties ranging from 5 to
21km/s (depending on the number of radial-velocity measurements
available for a given star). Based on the well-calibrated
near-infrared PMW1Z or PMKsZ, and MV-[Fe/H] relations, precise
distances are derived for these RRLs. Finally, we include Gaia DR2
proper motions in our catalog. The catalog should be very useful for
various Galactic studies, especially of the Galactic halo.
Description:
To collect known RRLs, we use the catalogs of variable stars from the
Quasar Equatorial Survey Team (QUEST; Vivas+ 2004, J/AJ/127/1158 ;
Mateu+ 2012, J/MNRAS/427/3374 ; Zinn+ 2014, J/ApJ/781/22), Northern
Sky Variability Survey (NSVS; Kinemuchi+ 2006, J/AJ/132/1202 ;
Hoffman+ 2009, J/AJ/138/466), Lowell Observatory Near-Earth-Object
Search (LONEOS; Miceli+ 2008, J/ApJ/678/865), General Catalogue of
Variable Stars (GCVS; Samus+ 2009, J/PASP/121/1378), the Lincoln
Near-Earth Asteroid Research (LINEAR; Sesar+ 2013, J/AJ/146/21) and
the Catalina (Drake+ 2013, J/ApJ/765/154 & 2014, J/ApJS/213/9) surveys.
See Section 2.1.
In the current work, our major spectroscopic data set comes from the
LAMOST Galactic spectroscopic surveys (Deng+ 2012RAA....12..735D 2012RAA....12..735D ;
Zhao+ 2012RAA....12..723Z 2012RAA....12..723Z ; Liu+ 2014IAUS..298..310L 2014IAUS..298..310L). The spectra
cover the wavelength range from 3700 to 9100Å with a resolving
power R∼1800.
Another main source of spectra comes from the Sloan Digital Sky Surey
(SDSS)/Sloan Extension for Galactic Understanding and Exploration
(SEGUE; Yanny+ 2009, J/AJ/137/4377). All the data from SEGUE and
SEGUE-II are included in SDSS Data Release 12 (SDSS DR12;
Alam+ 2015, V/147).
By combining the two data sets, a total of 6268 RRLs with a total of
31439 single-exposure spectra are obtained. Typical S/Ns of those
single-exposure spectra are around 15.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 302 6268 The RR Lyrae stars (RRLs) catalog
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See also:
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
V/150 : Updated catalog of variable stars in globular clusters (Clement+ 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)
J/AJ/108/1016 : Kinematics of local RR lyrae stars. I. (Layden, 1994)
J/AJ/110/2319 : Abundances in RR Lyr variables (Clementini+ 1995)
J/ApJ/598/597 : Frequency analysis of RR Lyrae (Alcock+, 2003)
J/AJ/127/1158 : QUEST RR Lyrae Survey first catalog (Vivas+, 2004)
J/AJ/129/267 : RR Lyrae variables in NGC 5272 (Cacciari+, 2005)
J/AJ/129/303 : Abundances of stars in M3 and M13 (Cohen+, 2005)
J/AJ/132/1202 : RR Lyrae in Northern Sky Var. Survey (Kinemuchi+, 2006)
J/AJ/132/714 : QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006)
J/ApJ/678/851 : RR Lyrae survey in the Galactic Halo (Keller+, 2008)
J/ApJ/678/865 : LONEOS-I RR Lyrae stars (Miceli+, 2008)
J/ApJ/684/1143 : BHB candidates in the Milky Way (Xue+, 2008)
J/MNRAS/396/553 : Galactic RR Lyrae data (Dambis, 2009)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/ApJ/691/306 : Phot. of RR Lyrae candidates in Virgo stream (Prior+, 2009)
J/PASP/121/1378 : Positions of var. stars in globular clusters (Samus+, 2009)
J/MNRAS/398/1757 : RR Lyraes in SDSS stripe 82 (Watkins+, 2009)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/AJ/139/59 : Milky Way halo velocity dispersion profile (Brown+, 2010)
J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010)
J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)
J/ApJ/731/4 : Galactic halo as seen by the CFHTLS (Sesar+, 2011)
J/MNRAS/422/2116 : BHB and RR Lyrae towards Anticentre and NGP (Kinman+, 2012)
J/MNRAS/427/3374 : QUEST RR Lyrae Survey III. Low Gal. latitude (Mateu+, 2012)
J/AJ/144/114 : Radial velocities of 6 field RR Lyrae (Sesar+, 2012)
J/MNRAS/424/2528 : RR Lyrae in SDSS Stripe 82 (Suveges+, 2012)
J/ApJ/765/154 : RR Lyrae stars in the Catalina Sky Survey (Drake+, 2013)
J/ApJ/763/32 : Galactic halo RRab stars from CSS (Drake+, 2013)
J/AJ/146/21 : LINEAR. II. Catalog of RR Lyrae stars (Sesar+, 2013)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/ApJ/782/59 : Abund. of 8 RR Lyrae subclass C var. stars (Govea+, 2014)
J/MNRAS/440/L96 : RR Lyrae AllWise photometry (Klein+, 2014)
J/ApJ/781/22 : RegionI of La Silla QUEST RR Lyrae star survey (Zinn+, 2014)
J/MNRAS/447/2404 : Equivalent width of 21 RR Lyrae stars (Pancino+, 2015)
J/MNRAS/448/822 : LAMOST candidate members of star clusters (Xiang+, 2015)
J/AJ/153/204 : RR Lyrae stars from the PS1 3π survey (Sesar+, 2017)
J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)
J/MNRAS/481/1195 : GaiaDR2 RR Lyrae stars as standard candles (Muraveva+, 2018)
J/A+A/622/A60 : Gaia DR2 misclassified RR Lyrae list (Clementini+, 2019)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/6268] Running sequence number
6- 15 F10.6 deg RAdeg Right ascension (J2000) (1)
17- 26 F10.6 deg DEdeg Declination (J2000) (1)
28- 37 F10.6 deg GLON Galactic longitude
39- 48 F10.6 deg GLAT Galactic latitude
50- 58 F9.4 mag Vmag [11.3/20.4]?=-999 Apparent V-band magnitude
60- 68 F9.4 mag e_Vmag ?=-999 Uncertainty in Vmag (always NULL)
70- 80 F11.6 d Per [0.15/2.9]?=-999 Period
82- 97 A16 --- r_Per Reference for Per (2)
99- 107 F9.1 d Epoch ?=-999 Date of maximum light from photometric
survey
109- 112 A4 --- n_Epoch Which type of EPOCH; MJD, JD, HJD
114- 115 A2 --- VType RR Lyrae Variable type
("AB": 4124 occurrences;
"C": 2071 occurrences or
"RR": 73 occurrences)
117- 124 F8.4 --- SNR [10/612] Spectral Signal-to-Noise at 4650
Angstroms
126- 133 F8.3 [-] FeH [-2.95/-0.016]?=-999 Metallicity derived in
this current work
135- 143 F9.3 [-] e_FeH [0.029/0.3]?=-999 Uncertainty in FeH
145- 152 F8.3 [-] FeHRef [-2.92/-0.59]?=-999 Metallicity from the
literature if available
154- 161 F8.3 [-] e_FeHRef [0.05/0.3]?=-999 Uncertainty in FeH-Ref
163- 170 F8.3 km/s RVel [-392/288]?=-999 Systemic radial velocity
derived in this current work (3)
172- 179 F8.3 km/s e_RVel [4.6/29]?=-999 Uncertainty in RVel
181- 188 F8.3 km/s RVel2 [-400/288]?=-999 Systemic radial velocity
determined in Section 4.3
190- 197 F8.3 km/s e_RVel2 [4.6/29]?=-999 Uncertainty in RVel2
199- 206 F8.3 km/s RVRef [-315/346]?=-999 Systemic radial velocity
from literature if available
208- 215 F8.3 km/s e_RVRef [0/15]?=-999 Uncertainty in RVRef
217- 224 F8.3 kpc Dist [0.4/84]?=-999 Distance derived in this
current work
226- 233 F8.3 kpc e_Dist [0.03/7]?=-999 Uncertainty in Dist
235- 242 F8.3 kpc DistRef [7.5/23.2]?=-999 Distance from literature if
available
244- 251 F8.3 kpc e_DistRef ?=-999 Uncertainty in DistRef (always NULL)
253- 263 F11.6 mas/yr pmRA [-68/58.1]?=-999 Gaia DR2 proper motion in
RA cos(DE)
265- 275 F11.6 mas/yr pmDE [-53/14.4]?=-999 Gaia DR2 proper motion in DE
277- 287 F11.6 mas/yr e_pmRA [0.016/1.7]?=-999 Uncertainty in pmRA
289- 299 F11.6 mas/yr e_pmDE [0.017/2.1]?=-999 Uncertainty in pmDE
301- 302 A2 --- Nsp Number of individual spectra available
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Note (1): From the photometric surveys.
Note (2): ADS bibcodes for the references as follows:
Drake2013aApJ = 2013, J/ApJ/765/154 (2991 occurrences)
Drake2013bApJ = 2013, J/ApJ/763/32 (221 occurrences)
Drake2014ApJS = 2014, J/ApJS/213/9 (1421 occurrences)
Hoffman2009AJ = 2009, J/AJ/138/466 (7 occurrences)
Keller2008ApJ = 2008, J/ApJ/678/851 (33 occurrences)
Kinemuchi2006AJ = 2006, J/AJ/132/1202 (30 occurrences)
Mateu2012MNRAS = 2012, J/MNRAS/427/3374 (9 occurrences)
Miceli2008ApJ = 2008, J/ApJ/678/865 (3 occurrences)
Samus2009GCVS = 2009, J/PASP/121/1378 (237 occurrences)
Sesar2013AJ = 2012, J/AJ/146/21 (973 occurrences)
Sesear2010ApJ = 2010, J/ApJ/708/717 (124 occurrences)
Suveges2012MNRAS = 2012, J/MNRAS/424/2528 (3 occurrences)
Vivas2004AJ.fit = 2005AJ....129..189V 2005AJ....129..189V (50 occurrences)
Watkins2009MNRAS = 2009, J/MNRAS/398/1757 (6 occurrences)
Zinn2014ApJ = 2014, J/ApJ/781/22 (160 occurrences)
Note (3): The radial velocities for type c RRLs are not recommended for use.
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History:
From electronic version of the journal
References:
Wang et al. Paper II. 2022MNRAS.513.1958W 2022MNRAS.513.1958W
Liu et al. Paper III. 2022MNRAS.517.2787L 2022MNRAS.517.2787L
Zhang et al. Paper IV. 2023MNRAS.525.5915Z 2023MNRAS.525.5915Z
Cabrera Garcia et al. Paper V. 2024MNRAS.527.8973C 2024MNRAS.527.8973C
Huang et al. Paper VI. 2024RAA....24g5009H 2024RAA....24g5009H
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Sep-2024