J/MNRAS/439/3765 RR Lyrae in 15 Galactic globular clusters (Dambis+, 2014)
Mid-infrared period-luminosity relations for globular cluster RR Lyrae.
Dambis A.K., Rastorguev A.S., Zabolotskikh M.V.
<Mon. Not. R. Astron. Soc., 439, 3765-3774 (2014)>
=2014MNRAS.439.3765D 2014MNRAS.439.3765D
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, infrared
Keywords: stars: distances - stars: variables: RR Lyrae -
globular clusters: general - infrared: stars
Abstract:
The period-metallicity-WISE W1- and W2-band luminosity relations are
derived for RR Lyrae stars based on WISE epoch photometry for 360 and
275 stars in 15 and 9 Galactic globular clusters, respectively. Our
final relations have the form
<MW1≥γW1-(2.381±0.097)logPF_+(0.096±0.021)[Fe/H] and
<MW2≥γW2-(2.269±0.127)logPF+(0.108±0.021)[Fe/H], where
[Fe/H] values are on the scale of Carretta et al.
(2009A&A...508..695C 2009A&A...508..695C). We obtained two appreciably discrepant
estimates for the zero-points γW1 and γW2 of both
relations: one based on a statistical-parallax analysis -
γW1=-0.829±0.093 and γW2=-0.776±0.093 and another,
significantly brighter one, based on Hubble Space Telescope (HST) Fine
Guidance Sensor (FGS) trigonometric parallaxes -
γW1,HST=-1.150±0.077 and γW2,HST=-1.105±0.077. The
period-metallicity-luminosity relations in the two bands yield highly
consistent distance moduli for the calibrator clusters and the
distance moduli computed using the W1- and W2-band relations with the
HST zero-points agree well with those computed by Sollima, Cacciari &
Valenti based on their derived period-metallicity-K-band luminosity
relation whose zero-point is tied to the HST trigonometric parallax of
RR Lyrae itself (ΔDM0 =0.04 and 0.06, respectively, with a
scatter of only 0.06).
Description:
Last year, the WISE All-Sky Data Release (Cutri et al., 2012, Cat.
II/328) was made public, mapping the entire sky in four mid-infrared
bands W1, W2, W3 and W4 with the effective wavelengths of 3.368,
4.618, 12.082 and 22.194um, respectively. We cross-correlated the WISE
single-exposure data base with the Catalogue of Galactic
globular-cluster variables by Clement et al. (2001AJ....122.2587C 2001AJ....122.2587C),
the Catalogue of Accurate Equatorial Coordinates for Variable Stars in
Globular Clusters by Samus et al. (2009PASP..121.1378S 2009PASP..121.1378S, Cat.
J/PASP/121/1378) and the catalogue of Sawyer Hogg
(1973PDDO....3....6S 1973PDDO....3....6S, Cat. V/97) (for ω Cen, NGC 6723 and NGC
6934) to compute (via Fourier fits) the intensity-mean average W1- and
W2-band magnitudes, and , for a total of 357 and 272 RR Lyrae
type variables in 15 and 9 Galactic globular clusters, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 360 The data for RR Lyraes in the calibrator GCs
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
V/97 : Updated 3rd Cat Variable Stars in Globular Clusters (Clement+ 1997)
J/PASP/121/1378 : Positions of variable stars in globular clusters
(Samus+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster name (NGCNNNN)
10- 18 A9 --- AName Alternative cluster name
20- 23 A4 --- Var Variable designation within the cluster (VNNN)
25- 32 F8.6 d Per Period
34- 40 F7.4 mag WISE W1-band intensity-mean magnitude
42- 47 F6.4 mag e_ rms uncertainty on
50- 56 F7.4 mag WISE W2-band intensity-mean magnitude
58- 63 F6.4 mag e_ rms uncertainty on
67- 69 A3 --- Type RR Lyr type: RR0=RRab, RR1=RRc(first overtone),
RR2=RRd (double mode), RR9=unknown subtype
73 I1 --- Use [0/1] Used (1) or rejected (0) in the final
Period-Luminosity relation fit
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Dec-2014