J/A+A/685/A153 R Lyr line-of-sight velocity templates (Prudil+, 2024)
The Galactic bulge exploration. II.
Line-of-sight velocity templates for single-mode RR Lyrae stars.
Prudil Z., Smolec R., Kunder A., Koch-Hansen A.J., Dekany I.
<Astron. Astrophys. 685, A153 (2024)>
=2024A&A...685A.153P 2024A&A...685A.153P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, infrared ; Optical ;
Radial velocities
Keywords: techniques: radial velocities - stars: variables: RR Lyrae -
Galaxy: bulge - Galaxy: kinematics and dynamics
Abstract:
We present a new set of tools to derive systemic velocities for
single-mode RR Lyrae stars from visual and near-infrared spectra. We
derived scaling relations and line-of-sight velocity templates using
both APOGEE and Gaia spectroscopic products combined with photometric
G-band amplitudes. We provide a means to estimate systemic velocities
for the RR Lyrae subclasses, RRab and RRc. Our analysis indicates that
the scaling relation between the photometric and line-of-sight
velocity amplitudes is nonlinear, with a break in a linear relation
occurring around ∼0.4mag in both the V-band and G-band amplitudes.
We did not observe such a break in the relation for the first-overtone
pulsators. Using stellar pulsation models, we further confirm and
examine the nonlinearity in scaling relation for the RRab subclass. We
observed little to no variation with stellar parameters (mass,
metallicity, and luminosity) in the scaling relation between the
photometric and line-of-sight velocity amplitudes for fundamental-mode
pulsators. We observed an offset in the scaling relation between the
observations and stellar pulsation models, mainly in the low-amplitude
RR Lyrae regime. This offset disappears when different sets of
convective parameters are used. Thus, the Fourier amplitudes obtained
from the photometry and line-of-sight velocity measurements can be
utilized to constrain convective parameters of stellar pulsation
models. The scaling relations and templates for APOGEE and Gaia data
accurately predict systemic velocities compared to literature values.
In addition, our tools derived from the Gaia spectra improve the
precision of the derived systemic velocities by approximately 50
percent and provide a better description of the uncertainty
distribution in comparison with previous studies. Our newly derived
tools will be used for RR Lyrae variables observed toward the Galactic
bulge.
Description:
In this study, we derived, for the first time, scaling relations
between photometric and line-of-sight velocity amplitudes together
with line-of-sight velocity templates for visual and near-infrared
spectra (covering Ca T and H passband). The aforementioned tools can
be used for estimating systemic velocities of single-mode RR Lyrae
stars.
To create scaling relations and line-of-sight velocity templates for
the APOGEE survey, we utilized several RR Lyrae variables in the Solar
neighborhood.
For the Gaia spectra that cover Ca T, we proceeded in nearly the same
way as in the APOGEE analysis.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 80 29 *List of nearby RR Lyrae variables observed by
APOGEE and marked with the rrlyr label in
APOGEE data products
tablea2.dat 79 5 Other nearby RR Lyrae stars observed by the
APOGEE survey used in the creation of the
line-of-sight velocity template for RR Lyrae stars
tablea4.dat 60 34 Table for 34 RRab type variables with the lowest
Amplos located at the nonlinear part of the
amplitude scaling relation
tablea6.dat 35 44 List of RR Lyrae stars used in the creation of
line-of-sight velocity templates from
Gaia RVS spectra
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Note on tablea1.dat: We note that DT-Gem is not included in this table, although
it is noted in the APOGEE files; it does not have an APOGEE-ID; and NVISITS is
zero for this variable.
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/674/A18 : Gaia DR3. The RR Lyrae sample (Clementini+, 2023)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- APOGEE APOGEE ID (2MHHMMSSss+DDMMSSs)
20- 39 A20 --- OName Alternative ID
40 A1 --- n_OName [*] Note (1)
43- 53 F11.7 deg RAdeg Right ascension (J2000)
55- 64 F10.6 deg DEdeg Declination (J2000)
66- 71 F6.3 mag Hmag 2MASS H magnitude
73- 74 I2 --- Nvisits ? Number of visits per star
76- 79 A4 --- Type Variable type
80 A1 --- n_Type [+] Note on Type (2)
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Note (1): * indicates a star used to create the line-of-sight velocity
templates.
Note (2): + marked as RR Lyrae variable in APOGEE DR17, but closer examination
using the ASAS-SN photometry and Gaia RR Lyrae catalog showed no luminosity
variation that would justify classification as an RR Lyrae pulsator.
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Gaia DR3 source_id
21- 25 F5.3 mag AmpG Photometric G amplitude
27- 31 F5.3 mag e_AmpG Photometric G amplitude error
33- 36 F4.1 km/s Amplos Line-of-sight velocity amplitude
38- 41 F4.1 km/s e_Amplos Line-of-sight velocity amplitude error
43- 49 F7.5 d P Puldation period
51- 55 F5.2 --- [Fe/H]phot ?=- Photometric metallicity (1)
57- 60 F4.2 --- e_[Fe/H]phot ? Photometric metallicity error (1)
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Note (1): from Gaia RR Lyrae catalog (Clementini et al., 2023A&A...674A..18C 2023A&A...674A..18C,
Cat. J/A+A/674/A18).
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Byte-by-byte Description of file: tablea6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [ABC] Note (1)
3- 21 I19 --- GaiaDR3 Gaia DR3 source_id
23- 29 F7.5 d P Pulsaton period
31- 35 A5 --- Type Variable type
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Note (1): Note as follows:
A = RRab P < 0.55 day
B = RRab 0.55 < P < 0.7 day
C = RRab P > 0.7 day
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History:
From electronic version of the journal
References:
Prudil et al. Paper I. 2024A&A...684A.176P 2024A&A...684A.176P
Kunder et al. Paper III. 2024AJ....168..139K 2024AJ....168..139K Cat. J/AJ/168/139
(End) Patricia Vannier [CDS] 17-Jul-2024