J/ApJ/841/84 Theoretical framework for RR Lyrae. II. MIR data (Neeley+, 2017)
On a new theoretical framework for RR Lyrae stars.
II. Mid-infrared period-luminosity-metallicity relations.
Neeley J.R., Marengo M., Bono G., Braga V.F., Dall'Ora M., Magurno D.,
Marconi M., Trueba N., Tognelli E., Moroni P.G.P., Beaton R.L.,
Freedman W.L., Madore B.F., Monson A.J., Scowcroft V., Seibert M.,
Stetson P.B.
<Astrophys. J., 841, 84 (2017)>
=2017ApJ...841...84N 2017ApJ...841...84N
ADC_Keywords: Stars, variable ; Photometry, infrared ; Stars, masses ; Models ;
Extinction ; Abundances, [Fe/H]
Keywords: infrared: stars; stars: horizontal-branch; stars: variables: RR Lyrae
Abstract:
We present new theoretical period-luminosity-metallicity (PLZ)
relations for RR Lyrae stars (RRLs) at Spitzer and WISE wavelengths.
The PLZ relations were derived using nonlinear, time-dependent
convective hydrodynamical models for a broad range of metal abundances
(Z=0.0001-0.0198). In deriving the light curves, we tested two sets of
atmospheric models and found no significant difference between the
resulting mean magnitudes. We also compare our theoretical relations
to empirical relations derived from RRLs in both the field and in the
globular cluster M4. Our theoretical PLZ relations were combined with
multi-wavelength observations to simultaneously fit the distance
modulus, µ0, and extinction, AV, of both the individual Galactic
RRL and of the cluster M4. The results for the Galactic RRL are
consistent with trigonometric parallax measurements from Gaia's first
data release. For M4, we find a distance modulus of
µ0=11.257±0.035mag with AV=1.45±0.12mag, which is consistent
with measurements from other distance indicators. This analysis has
shown that, when considering a sample covering a range of iron
abundances, the metallicity spread introduces a dispersion in the PL
relation on the order of 0.13mag. However, if this metallicity
component is accounted for in a PLZ relation, the dispersion is
reduced to ∼0.02mag at mid-infrared wavelengths.
Description:
We compiled multi-wavelength observations for a sample of 55 nearby
Galactic RRLs. Most of the observations were collected as part of the
Carnegie RR Lyrae Program (CRRP, PID 90002), and were published in
Monson+ (2017, J/AJ/153/96). See section 3 for further details.
For this work, we have also performed new photometry of single-epoch
archival observations of M4 from Spitzer's cryogenic mission 5.8 and
8.0um bands. We elected to use the single epoch observation as the
estimated mean magnitude with an uncertainty equal to half the
amplitude in the 3.6 or 4.5um bands. These results as well as the
updated mean magnitudes from Neeley+ (2015, J/ApJ/808/11) are
available in Table 7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 62 Intensity mean magnitudes for entire grid of FO models
table2.dat 99 166 Intensity mean magnitudes for entire grid of FU models
table4.dat 70 234 Theoretical 2-band Period-Wesenheit-Metallicity
relations
table5.dat 70 1053 Theoretical 3-band Period-Wesenheit-Metallicity
relations
table6.dat 116 55 Galactic RR Lyrae sample
table7.dat 66 43 Updated photometry for RR Lyrae in M4
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/AJ/132/714 : QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006)
J/MNRAS/386/2115 : Type II Cepheid and RR Lyrae variables (Feast+, 2008)
J/AJ/142/187 : HST obs. of 7 Pop.II variable stars (Benedict+, 2011)
J/MNRAS/439/3765 : RR Lyrae in 15 Galactic globular clusters (Dambis+, 2014)
J/PASP/126/521 : UBVRIJHK photometry of RR Lyrae in M4 (Stetson+, 2014)
J/ApJ/814/71 : Carina project IX: Carina variables UBVI (Coppola+, 2015)
J/ApJ/808/11 : RR Lyrae stars in M4. II. Spitzer/IRAC phot. (Neeley+, 2015)
J/ApJ/832/176 : Classical Cepheids in MCs. I. LMC disk (Inno+, 2016)
J/AJ/153/96 : Standard Galactic field RR Lyrae. I. Phot. (Monson+, 2017)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z [0.0001/0.02] Model Metallicity; mass fraction
8- 12 F5.3 --- Y [0.24/0.27] Model He abundance; mass fraction
14- 17 F4.2 Msun Mass [0.5/0.8] Model mass
19- 22 I4 K Teff [5600/7200] Effective temperature
24- 27 F4.2 [Lsun] log(L) [1.4/2] Logarithm (base 10) of total luminosity
29- 35 F7.4 [d] log(P) [-0.6/0.2] Logarithm (base 10) of
pulsation period
38- 43 F6.3 mag 3.6mag [-1.6/0.3] Mean model Spitzer/IRAC 3.6um
magnitude (1)
46- 51 F6.3 mag 4.5mag [-1.6/0.3] Mean model Spitzer/IRAC 4.5um
magnitude (1)
54- 59 F6.3 mag 5.8mag [-1.6/0.3] Mean model Spitzer/IRAC 5.8um
magnitude (1)
62- 67 F6.3 mag 8.0mag [-1.6/0.2] Mean model Spitzer/IRAC 8.0um
magnitude (1)
70- 75 F6.3 mag W1mag [-1.6/0.3] Mean model WISE 3.4um (W1) magnitude (1)
78- 83 F6.3 mag W2mag [-1.6/0.3] Mean model WISE 4.6um (W2) magnitude (1)
86- 91 F6.3 mag W3mag [-1.6/0.2] Mean model WISE 12um (W3) magnitude (1)
94- 99 F6.3 mag W4mag [-1.6/0.2] Mean model WISE 22um (W4) magnitude (1)
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Note (1): Intensity-averaged.
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Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Mode Indicates a FO, FU, or fundamentalized relation
7- 14 A8 --- Wmag Bands used to calculate Wesenheit magnitude (1)
17- 21 F5.3 --- alpha [0.007/5] Coefficient of the color term (2)
23- 28 F6.3 mag a [-1.8/-0.7] Coefficient a in a+b*logP+c*[Fe/H]
30- 35 F6.3 --- b [-3.1/-2.1] Coefficient b in a+b*logP+c*[Fe/H]
in mag/[d] units
37- 42 F6.3 --- c [-0.02/0.3] Coefficient c in a+b*logP+c*[Fe/H]
in mag/[-] units
45- 49 F5.3 mag e_a [0.005/0.05] Uncertainty in the coefficient a
52- 56 F5.3 --- e_b [0.01/1] Uncertainty in the coefficient b
59- 63 F5.3 --- e_c [0.002/0.008] Uncertainty in the coefficient c
66- 70 F5.3 mag sigma [0.01/0.08] RMS dispersion of the relation
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Note (1): I1, I2, I3, and I4 correspond to Spitzer/IRAC 3.6um, 4.5um, 5.8um,
and 8.0um, respectively.
Note (2): Estimated using the Cardelli+ (1989ApJ...345..245C 1989ApJ...345..245C) reddening law,
extended into the MIR according to Indebetouw+ (2005ApJ...619..931I 2005ApJ...619..931I).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name RR Lyrae name
10- 11 I2 h RAh Hour of right ascension (J2000)
13- 14 I2 min RAm Minute of right ascension (J2000)
16- 23 F8.5 s RAs Second of right ascension (J2000)
25 A1 --- DE- Sign of declination (J2000)
26- 27 I2 deg DEd Degree of declination (J2000)
29- 30 I2 arcmin DEm Arcminute of declination (J2000)
32- 38 F7.4 arcsec DEs Arcsecond of declination (J2000)
40- 49 F10.8 d Per [0.2/0.8] Pulsation period
51- 55 F5.2 [-] [Fe/H] [-2.6/-0.07] Metallicity adopted from
Feast+, 2008, J/MNRAS/386/2115
57- 60 A4 --- Type RR Lyrae type (36 "RRab" and 19 "RRc")
62- 65 F4.2 mag AvL [0.03/0.6]? Extinction adopted from
Feast+, 2008, J/MNRAS/386/2115 (1)
67- 70 F4.2 mag muHST [7.1/9.4]? HST distance modulus
72- 75 F4.2 mag e_muHST [0.07/0.3]? muHST uncertainty
77- 82 F6.3 mag muG [7.1/13.4]? Gaia distance modulus
84- 88 F5.3 mag e_muG [0.1/3.5]? muG uncertainty
90- 95 F6.3 mag mu [6.9/12.6] Distance modulus from this work
97-101 F5.3 mag e_mu [0.01/0.04] mu uncertainty
103 A1 --- l_Av Limit flag on Av
105-109 F5.3 mag Av Extinction from this work
110 A1 --- f_Av [b] b: Fit only provided upper limit
112-116 F5.3 mag e_Av [0.1/0.2]? Av uncertainty
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Note (1): AV=3.1E(B-V)
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- ID ID number (1)
5- 14 F10.8 d Per [0.2/0.9] Pulsation period
16- 21 F6.3 mag [3.6] [10.5/11.5]? Spitzer/IRAC 3.6um magnitude
23- 27 F5.3 mag e_[3.6] [0.02/0.2]? [3.6] uncertainty
29- 34 F6.3 mag [4.5] [10.4/11.5]? Spitzer/IRAC 4.5um magnitude
36- 40 F5.3 mag e_[4.5] [0.01/0.2]? [4.5] uncertainty
42- 47 F6.3 mag [5.8] [10.3/11.5]? Spitzer/IRAC 5.8um magnitude
49- 53 F5.3 mag e_[5.8] [0.02/0.3]? [5.8] uncertainty
55- 60 F6.3 mag [8.0] [10.3/11.5]? Spitzer/IRAC 8.0um magnitude
62- 66 F5.3 mag e_[8.0] [0.01/0.4]? [8.0] uncertainty
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Note (1): As given in Stetson+, 2014, J/PASP/126/521 and
Neeley+, 2015, J/ApJ/808/11 ; <Cl* NGC 6121 SAW VNN> in Simbad or
<[SBD2014] C1> in Simbad for C1.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Jan-2018