J/A+A/693/A28 Unveiling VVV/WISE Mira variables (Albarracin+, 2025)
Unveiling VVV/WISE Mira variables on the far side of the Galactic disk.
Distances, kinematics and a new extinction law.
Albarracin R., Zoccali M., Olivares Carvajal J., Rojas-Arriagada A.,
Minniti J.H., Catelan M., De Leo M., Gran F., Contreras Ramos R.,
Valenzuela Navarro A., Salvo-Guajardo C.
<Astron. Astrophys. 693, A28 (2025)>
=2025A&A...693A..28A 2025A&A...693A..28A (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, variable ; Photometry ; Optical ; Infrared ;
Proper motions ; Stars, distances
Keywords: stars: AGB and post-AGB - stars: variables: general -
Galaxy: bulge - Galaxy: disk - Galaxy: kinematics and dynamics -
Galaxy: structure
Abstract:
The structure and kinematics of the Milky Way disk are largely
inferred from the solar vicinity. To gain a comprehensive
understanding, it is essential to find reliable tracers in
less-explored regions like the bulge and the far side of the disk.
Mira variables, which are well-studied and bright standard candles,
offer an excellent opportunity to trace intermediate and old
populations in these complex regions. We aim to isolate a clean sample
of Miras in the Vista Variables in the Via Lactea survey using
Gaussian process algorithms. This sample will be used to study
intermediate and old age populations in the Galactic bulge and far
disk. Near- and mid-infrared time-series photometry were processed
using Gaussian Process algorithms to identify Mira variables and model
their light curves. We calibrated selection criteria with a visually
inspected sample to create a high-purity sample of Miras, integrating
multi-band photometry and kinematic data from proper motions. We
present a catalog of 3602 Mira variables. By analyzing photometry, we
classify them by O-rich or C-rich surface chemistry and derive
selective-to-total extinction ratios of AKs/E(J-Ks)=0.471±0.01 and
AKs/E(H-Ks)=1.320±0.020. Using the Mira period-age relation, we
find evidence supporting the inside-out formation of the Milky Way
disk. The distribution of proper motions and distances aligns with the
Galactic rotation curve and disk kinematics. We extend the rotation
curve up to RGC∼17kpc and find no strong evidence of the nuclear
stellar disk in our Mira sample. This study constitutes the largest
catalog of variable stars on the far side of the Galactic disk to
date.
Description:
We present the results of a study of Mira variable stars in the bulge
and far side of the Galactic disk. These stars have been selected from
the Ks-band light-curves and have modeled magnitudes in the VVV and
WISE bands. We present in tabled1.dat the observational parameters
derived from the surveys, with the respective kinematic and distance
data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tabled1.dat 194 3602 Observational parameters of the Miras in our sample
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See also:
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC)
(IPAC/UMass, 2003-2006)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/376 : VISTA Variable in the Via Lactea Survey (VVV) DR4.2
(Minniti+, 2023)
J/A+A/684/A214 : Photometry & proper motion cat. in NSD region (Zoccali+, 2024)
Byte-by-byte Description of file: tabled1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID ID of the star
17- 24 F8.4 deg GLON Galactic longitude
26- 33 F8.4 deg GLAT Galactic latitude
35- 40 F6.1 d Per Period
42- 47 F6.3 mag Jmag ?=-9.999 J band model magnitude
49- 54 F6.3 mag e_Jmag ?=-9.999 J band magnitude error
56- 61 F6.3 mag Hmag ?=-9.999 H band model magnitude
63- 68 F6.3 mag e_Hmag ?=-9.999 H band magnitude error
70- 75 F6.3 mag Ksmag Ks band model magnitude
77- 81 F5.3 mag e_Ksmag Ks band magnitude error
83- 88 F6.3 mag W1mag ?=-9.999 W1 band model magnitude
90- 95 F6.3 mag e_W1mag ?=-9.999 W1 band magnitude error
97-102 F6.3 mag W2mag ?=-9.999 W2 band model magnitude
104-109 F6.3 mag e_W2mag ?=-9.999 W2 band magnitude error
111-116 F6.3 mag W3mag ?=-9.999 W3 band model magnitude
118-123 F6.3 mag e_W3mag ?=-9.999 W3 band magnitude error
125-130 F6.3 mag W4mag ?=-9.999 W4 band model magnitude
132-137 F6.3 mag e_W4mag ?=-9.999 W4 band mag error
139 A1 --- Type [COF] Type of the star
145-151 F7.3 mas/yr pmGLON ?=-99.999 Longitude proper motion
153-159 F7.3 mas/yr e_pmGLON ?=-99.999 Longitude proper motion error
161-167 F7.3 mas/yr pmGLAT ?=-99.999 Latitude proper motion
169-175 F7.3 mas/yr e_pmGLAT ?=-99.999 Latitude proper motion error
177-182 F6.2 kpc Dist ?=-9.99 Distance to the star
184-189 F6.2 kpc e_Dist ?=-9.99 Distance error
191-194 F4.2 mag MinMaxKs Minimum and maximum Ks magnitude
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Acknowledgements:
Rogelio Albarracin Contreras, rialbarracin(at)mpia.de
(End) Rogelio Albarracin Contreras [MPIA], Patricia Vannier [CDS] 14-Nov-2024