J/MNRAS/502/4074 Period-luminosity-metallicity relation of RRLs (Muhie+, 2021)
Kinematics and multiband period-luminosity-metallicity relation of RR Lyrae
stars via statistical parallax.
Muhie T.D., Dambis A.K., Berdnikov L.N., Kniazev A.Y., Grebel E.K.
<Mon. Not. R. Astron. Soc., 502, 4074-4092 (2021)>
=2021MNRAS.502.4074M 2021MNRAS.502.4074M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Milky Way ; Parallaxes, trigonometric ;
Abundances, [Fe/H] ; Proper motions ; Radial velocities ;
Optical ; Infrared
Keywords: stars: distances - stars: kinematics and dynamics -
stars: variables: RR Lyrae - solar neighbourhood
Abstract:
This paper presents results from photometric and statistical-parallax
analysis of a sample of 850 field RR Lyrae (RRL) variables. The
photometric and spectroscopic data for our sample of RRLs are obtained
from (1) our new spectroscopic observations (for 448 RRLs) carried out
with the Southern African Large Telescope; (2) our photometric
observations using the 1.0-m telescope of the South African
Astronomical Observatory, and (3) literature. These are combined with
accurate proper motion data from the second data release of the Gaia
mission (DR2). This study primarily determines the velocity
distribution of solar neighbourhood RRLs, and it also calibrates the
zero-points of the RRLs' visual V-band luminosity-metallicity (LZ or
MV-[Fe/H]) relation and their period-luminosity-metallicity (PLZ)
relations in the Wide-field Infrared Survey Explorer W1 and Two-Micron
All-Sky Survey Ks bands. We find the bulk velocity of the halo RRLs
relative to the Sun to be
(U0,V0,W0)Halo=(-16±7,-219±7,-6±5)km/s in the direction
of Galactic centre, Galactic rotation, and North Galactic pole,
respectively, with velocity-dispersion ellipsoids
(σVR,σVph,σVθ)Halo=
(153±7,106±4,101±4)km/s. The corresponding parameters for the
disc component are found to be
(U0,V0,W0)Disc=(-19±5,-46±5,-14±3)km/s and
(σVR,σVph,σVθ)Disc=
(49±4,38±4,25±3)km/s. The calibrated PLZ in W1-, Ks-, and V-band
LZ relations are
<MW1≥-0.824+0.124[Fe/H]-2.381logPF,
<MKs≥-0.804+0.101[Fe/H]-2.33logPF, and <MV≥1.041+0.232[Fe/H],
respectively. The calibrated PLZ and LZ relations are used to estimate
the Galactic Centre distance and the distance modulus of the Large
Magellanic Cloud (LMC), which are found to be 7.99±0.49kpc and
18.46±0.09mag, respectively. All our results are in excellent
agreement with available literature based on statistical-parallax
analysis, but are considerably more accurate and precise. Moreover,
the zero-points of our calibrated PLZ and LZ relations are quite
consistent with current results found by other techniques and yield an
LMC distance modulus that is within 0.04mag of the current most
precise estimate.
Description:
In order to determine the kinematic model parameters and calibrate the
MV-[Fe/H] and PLZ relations in the Ks and W1 bands using the
statistical-parallax method with better precision, we need a large
sample of RRLs with (1) known periods and pulsation modes; (2)
accurate and precise apparent mean magnitude in the Johnson V, 2MASS
Ks, and WISE W1 passbands; (3) proper motions, metallicities,
radial velocities, and extinctions in one of the passbands. Initially,
our sample for this work consists of 850 RRLs. Depending on the
spectroscopic data source, we subdivide this sample of RRLs into two
parts: the first one is the most complete sample of Galactic field RRL
type variables employed in our previous statistical-parallax analysis
(Dambis et al. 2013MNRAS.435.3206D 2013MNRAS.435.3206D, Cat. J/MNRAS/435/3206), this list
initially includes a total of 403 Galactic field RRL stars but one RRL
is discarded due to current updates; the second part consists of 448
RRL type variables, which have our own new spectroscopic data acquired
as a result of observations performed with SALT telescope.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 187 850 850 Galactic field RRL variables data base
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/MNRAS/435/3206 : Properties of field RR Lyrae variables (Dambis+, 2013)
J/ApJS/237/28 : WISE catalog of periodic variable stars (Chen+, 2018)
J/MNRAS/441/715 : Mid-infrared study of RR Lyrae stars (Gavrilchenko+, 2014)
J/AJ/158/105 : IR photometry of field RR Lyrae variable stars
(Layden+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name GCVS variable name
10- 19 F10.6 deg RAdeg Right ascension (J2000)
21- 30 F10.6 deg DEdeg Declination (J2000)
32- 41 F10.8 d Period Variability period
43- 46 A4 --- Type RR Lyrae type
48- 55 F8.5 mag Vmag V-band intensity-mean magnitude
57 I1 --- r_Vmag Reference for Vmag (1)
59- 68 F10.7 mag AV V-band interstellar extinction
70- 77 F8.5 [-] [Fe/H] Fe/H abundance ratio on the Zinn & West
(1984ApJS...55...45Z 1984ApJS...55...45Z) scale
79 I1 --- r_[Fe/H] Reference for [Fe/H] (1)
81- 90 F10.7 mag Ksmag Ks-band magnitude
92-100 F9.7 mag e_Ksmag Error on Ksmag
102 I1 --- r_Ksmag Reference for Ksmag (1)
104-110 F7.4 mag W1mag WISE W1 (3.4um) band magnitude
112-117 F6.4 mag e_W1mag ? Error on W1mag
119 I1 --- r_W1mag Reference for W1mag (1)
121-130 F10.5 km/s RV Radial velocity
132-140 F9.5 km/s e_RV Error on RV
142 I1 --- r_RV Reference for RV (1)
144-151 F8.3 mas/yr pmRA Proper motion in right ascension from Gaia DR2
153-157 F5.3 mas/yr e_pmRA Error on pmRA
159-166 F8.3 mas/yr pmDE Proper motion in declination from Gaia DR2
168-172 F5.3 mas/yr e_pmDE Error on pmDE
174-180 F7.4 mas plx Parallax from Gaia DR2
182-187 F6.4 mas e_plx ? Error on plx
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Note (1): Reference as follows:
1 = Our observations
2 = Gaia DR2 (Gaia Collaboration 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345)
3 = Dambis et al. (2013MNRAS.435.3206D 2013MNRAS.435.3206D, Cat. J/MNRAS/435/3206)
4 = Chen et al. (2018ApJS..237...28C 2018ApJS..237...28C, Cat. J/ApJS/237/28)
5 = Gavrilchenko et al. (2014MNRAS.441..715G 2014MNRAS.441..715G, Cat. J/MNRAS/441/715)
6 = ALL WISE single epoch magnitude
7 = 2MASS single epoch observation
8 = Layden et al. (2019AJ....158..105L 2019AJ....158..105L, Cat. J/AJ/158/105)
9 = mean estimation in this paper and Dambis et al. (2013MNRAS.435.3206D 2013MNRAS.435.3206D,
Cat. J/MNRAS/435/3206)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 30-Oct-2023