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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
Note (1): Intensity-averaged.
Byte-by-byte Description of file: table[45].dat
Bytes Format Units Label Explanations
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
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) reddening law, extended into the MIR according to Indebetouw+ (2005ApJ...619..931I).
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
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
Note (1): AV=3.1E(B-V)
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
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.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Jan-2018
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