J/ApJS/272/31 RVels & metallicities of RR Lyrae stars from LAMOST (Wang+, 2024)
Stellar atmospheric parameters of ∼11000 RR Lyrae stars from LAMOST spectra.
Wang J., Shi J., Fu J., Zong W., Li C.
<Astrophys. J. Suppl. Ser., 272, 31 (2024)>
=2024ApJS..272...31W 2024ApJS..272...31W
ADC_Keywords: Stars, variable; Radial velocities; Spectra, optical; Abundances
Keywords: RR Lyrae variable stars ; Spectroscopy ; Stellar atmospheres ;
Stellar pulsations
Abstract:
Accurate determination of the stellar atmospheric parameters of
RR Lyrae stars (RRLs) requires short individual exposures of the
spectra to mitigate pulsation effects. We present improved
template-matching methods to determine the stellar atmospheric
parameters of RRLs from single-epoch spectra of the Large Sky Area
Multi-Object Fiber Spectroscopic Telescope, also known as the
Guoshoujing Telescope (LAMOST). We determine the radial velocities and
stellar atmospheric parameters (effective temperature Teff, surface
gravity logg, and metallicity [M/H]) of 10486 and 1027 RRLs from
42729 LAMOST low-resolution spectra (LRS) and 7064 LAMOST
medium-resolution spectra (MRS), respectively. Our results are in good
agreement with the parameters of other databases, where the external
uncertainties of Teff, logg, and [M/H] for LRS/MRS are estimated to be
207/142K, 0.21/0.16dex, and 0.24/0.18dex, respectively. We conclude
with the variation characteristics of the radial velocities (RV) and
stellar atmospheric parameters for RRLs during the pulsation phase.
There is a significant difference of 28±21km/s between the
peak-to-peak amplitude (Aptp) of RV from the Hα line
(RVHα) and from metal lines (RVmetal) for RRab, whereas it
is only 4±17km/s for RRc. The Aptp of Teff is 930±456 and
409±375K for RRab and RRc, respectively. The logg of RRab shows a
mild variation of approximately 0.22±0.42dex near the phase of
φ=0.9, while that of RRc almost remains constant. The [M/H] of
RRab and RRc show a minor variation of about 0.25±0.50 and
0.28±0.55dex, respectively, near the phase of φ=0.9. We expect
that the determined stellar atmospheric parameters would shed new
light on the study of stellar evolution and pulsation, the structure
of the Milky Way, as well as other research fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
targets.dat 42 11513 List of 11513 Gaia DR3 targets from Tables 2 and 3;
table added by CDS
table2.dat 243 42729 The radial velocities and stellar atmospheric
parameters of LAMOST DR10 LRS (R∼1800) for 10486 RRLs
table3.dat 195 7064 The radial velocities and stellar atmospheric
parameters of LAMOST DR10 MRS (R∼7500) for 1027 RRLs
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)
J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)
J/AcA/61/285 : VI light curves of Gal. Bulge Cepheids (Soszynski+, 2011)
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/ApJ/848/68 : Abund. & RVs of stable and Blazhko RRc stars (Sneden+, 2017)
J/MNRAS/481/1195 : GaiaDR2 RR Lyrae stars as standard candles (Muraveva+, 2018)
J/ApJ/881/104 : Spectroscopic obs. of RR Lyrae in NGC5139 (Magurno+, 2019)
J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)
J/ApJS/251/15 : LAMOST-Kepler/K2 survey (LK-MRS) 1st year obs. (Zong+, 2020)
J/ApJ/919/85 : Field RR Lyrae as Galactic probes. V. (Braga+, 2021)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJ/914/10 : Field RR Lyrae as Gal. probes. III. Abund. (Crestani+, 2021)
J/MNRAS/502/4074 : Period-luminosity-metallicities of RRLs (Muhie+, 2021)
J/ApJ/912/144 : Metallicity of Gal. RR Lyrae from LCs (Mullen+, 2021)
J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)
J/ApJ/931/131 : Metallicity of Gal. RRLyrae from LCs. II. (Mullen+, 2022)
J/A+A/674/A18 : Gaia DR3. The RR Lyrae sample (Clementini+, 2023)
J/A+A/678/A138 : Toward more accurate RR Lyrae metallicities (Kovacs+, 2023)
Byte-by-byte Description of file: targets.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source name from Gaia DR3 RRLs catalog
21- 28 F8.6 d Per [0.18/1]? Period of RRLs (G2)
30- 33 A4 --- Type Classification of RRLs (1)
35- 38 A4 --- Ref Catalog from which period and t0 were
obtained (G4)
40- 42 A3 --- Res LAMOST resolution ("LRS" for Table 2;
or "MRS" for Table 3)
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Note (1): RR Lyrae type as follows:
RRab = 6564 occurrences
RRc = 4517 occurrences
RRd = 432 occurrences
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source name from Gaia DR3 RRLs catalog
21- 30 I10 --- ObsID [101206/1018107193] Unique identification
number ID of LAMOST spectrum
32- 33 I2 h RAh Hour of Right Ascension (J2000) (G1)
35- 36 I2 min RAm Minute of Right Ascension (J2000) (G1)
38- 42 F5.2 s RAs Second of Right Ascension (J2000) (G1)
44- 44 A1 --- DE- Sign of Declination (J2000) (G1)
45- 46 I2 deg DEd Degree of Declination (J2000) (G1)
48- 49 I2 arcmin DEm Arcminute of Declination (J2000) (G1)
51- 55 F5.2 arcsec DEs Arcsecond of Declination (J2000) (G1)
57- 64 F8.6 d Per [0.18/1]? Period of RRLs (G2)
66- 69 F4.2 --- phi [0/1]? Phase derived from t0 and period (G2)
71- 74 A4 --- Type Classification of RRLs (G2)
76- 86 F11.6 d HJD [5858.48/9732.8] Heliocentric Julian Date
at mid-exposure; HJD-2450000.5
88- 93 F6.2 --- SNR [10/287.3] Signal-to-noise ratio of LRS
in SDSS g-band (G3)
95-100 F6.1 km/s RVm [-772.2/1114.8] Radial velocity of metal line
determined from metal segment
102-106 F5.1 km/s e_RVm [0/114.1] Uncertainty in RVm
108-114 F7.1 km/s RVHa [-5806/14727] Radial velocity of Hα line
determined from Hα segment
116-121 F6.1 km/s e_RVHa [0/1431]? Uncertainty in RVHa
123-130 F8.1 km/s RVHb [-15204/4549] Radial velocity of Hβ line
determined form Hβ segment
132-137 F6.1 km/s e_RVHb [0/1433]? Uncertainty in RVHb
139-145 F7.1 km/s RVHg [-4961/1332] Radial velocity of Hγ line
determined from Hγ segment
147-152 F6.1 km/s e_RVHg [0/1180]? Uncertainty in RVHg
154-160 F7.1 km/s RVHd [-4325/15528] Radial velocity of Hδ line
determined from Hδ segment
162-166 F5.1 km/s e_RVHd [0/916]? Uncertainty in RVHd
168-173 F6.1 K Teff [5500/8000] Effective temperature
175-179 F5.1 K e_Teff [16.9/194]? Uncertainty in Teff
181-184 F4.2 [-] logg [1.6/4] Log of surface gravity
186-189 F4.2 [-] e_logg [0/0.8]? Uncertainty in logg
191-195 F5.2 [-] [M/H] [-3/0] Metallicity
197-200 F4.2 [-] e_[M/H] [0/0.5]? Uncertainty in [M/H]
202-205 A4 --- Ref Catalog from which period and t0 were
obtained (G4)
207-209 F3.1 --- Prob1 [0/1]? Probability of RRLs provided by ASAS-SN
in respective reference (G5)
211-215 F5.1 --- Prob2 [-94.6/0] Probability of RRLs provided by ZTF
in respective reference (G5)
217-219 F3.1 --- Prob3 [0/1] Probability of RRLs provided by PS1
in respective reference (G5)
221-222 I2 --- Nc [0/54] Count of contaminated targets within
the Δd≤3.7"
224-233 F10.6 deg RAFdeg Right Ascension in decimal degrees (J2000) (G1)
235-243 F9.6 deg DEFdeg Declination in decimal degrees (J2000) (G1)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source name from Gaia DR3 RRLs catalog
21- 30 I10 --- ObsID [591904235/1018414035] Unique identification
number ID of LAMOST spectrum
32- 33 I2 h RAh Hour of Right Ascension (J2000) (G1)
35- 36 I2 min RAm Minute of Right Ascension (J2000) (G1)
38- 42 F5.2 s RAs Second of Right Ascension (J2000) (G1)
44 A1 --- DE- Sign of Declination (J2000) (G1)
45- 46 I2 deg DEd Degree of Declination (J2000) (G1)
48- 49 I2 arcmin DEm Arcminute of Declination (J2000) (G1)
51- 55 F5.2 arcsec DEs Arcsecond of Declination (J2000) (G1)
57- 64 F8.6 d Per [0.18/0.92]? Period of RRLs (G2)
66- 69 F4.2 --- phi [0/1]? Phase derived from t0 and period (G2)
71- 74 A4 --- Type Classification of RRLs (G2)
76- 86 F11.6 d HJD [8031.5/9736.8] Heliocentric Julian Date at
mid-exposure; HJD-2450000.5
88- 93 F6.2 --- SNR [10/999] Signal-to-noise ratio of LRS in SDSS
g-band (G3)
95- 100 F6.1 km/s RVm [-617/720.1] Radial velocity of metal line
determined from metal segment
102- 105 F4.1 km/s e_RVm [0/34.6] Uncertainty in RVm
107- 113 F7.1 km/s RVHa [-2270.3/2337.5] Radial velocity of Hα
line determined from Hα segment
115- 119 F5.1 km/s e_RVHa [0/825.1]? Uncertainty in RVHa
121- 126 F6.1 K Teff [5500/8000] Effective temperature
128- 132 F5.1 K e_Teff [16.9/173.1]? Uncertainty in Teff
134- 137 F4.2 [-] logg [1.7/3.9] Log of surface gravity
139- 142 F4.2 [-] e_logg [0.1/0.8] Uncertainty in log (g)
144- 148 F5.2 [-] [M/H] [-2.99/-0.01] Metallicity
150- 153 F4.2 [-] e_[M/H] [0/0.4] Uncertainty in [M/H]
155- 158 A4 --- Ref Catalog from which period and t0 were
obtained (G4)
160- 162 F3.1 --- Prob1 [0/1]? Probability of RRLs provided by
ASAS-SN in respective reference (G5)
164- 168 F5.1 --- Prob2 [-83.5/0] Probability of RRLs provided by ZTF
in respective reference (G5)
170- 172 F3.1 --- Prob3 [0/1] Probability of RRLs provided by PS1 in
respective reference (G5)
174 I1 --- Nc [0/0] Count of contaminated targets within
the Δd≤3.7"
176- 185 F10.6 deg RAFdeg Right Ascension in decimal degrees (J2000) (G1)
187- 195 F9.6 deg DEFdeg Declination in decimal degrees (J2000) (G1)
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Global notes:
Note (G1): The input value to which the fiber was pointed.
Note (G2): From the catalog in Ref. The t0 (epoch zero) is defined as at
maximum luminosity.
Note (G3): An indicator for the quality of the spectrum.
Note (G4): Catalog as follows:
PS1 = The Pan-STARRS1 survey is a multiepoch and multicolor photometry
project with a wide field of view. Approximately 239044 RRL
candidates are obtained using data from the PS1 3π survey
(Sesar+ 2017, J/AJ/153/204).
Gaia = The RRL catalog of Gaia DR3 (see I/355 and I/358) contains 270905 RRLs,
classified through the Gaia DR3 multiband (G, BP, and RP bands) light
and RV curves using the SOS Cep&RRL pipeline
(Clementini+ 2023, J/A+A/674/A18).
ZTF = The Zwicky Transient Facility is an optical survey project focused on
the northern sky. A total of 46393 RRLs have been classified using
the light curves from ZTF DR2 (Chen+ 2020, J/ApJS/249/18).
ASAS = The All-Sky Automated Survey for Supernovae (ASAS-SN) is an all-sky
optical survey project that has confirmed about 1.5 million variable
stars to date, of which ∼45065 are RRLs
(Christy+ 2023MNRAS.519.5271C 2023MNRAS.519.5271C).
Note (G5):
0 = target is not included in the reference catalog.
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History:
From electronic version of the journal
(End) Preperad by [AAS], Emmanuelle Perret [CDS] 20-Aug-2024