J/ApJ/715/277 Insights into the Cepheid distance scale (Bono+, 2010)
Insights into the Cepheid distance scale.
Bono G., Caputo F., Marconi M., Musella I.
<Astrophys. J., 715, 277-291 (2010)>
=2010ApJ...715..277B 2010ApJ...715..277B
ADC_Keywords: Galaxies, nearby ; Abundances ; Stars, variable ; Stars, distances
Keywords: Galaxy: disk - Local Group - Magellanic Clouds - stars: distances -
stars: oscillations - stars: variables: Cepheids
Abstract:
We present a detailed investigation of the Cepheid distance scale by
using both theory and observations. Through the use of pulsation
models for fundamental mode Cepheids, we found that the slope of the
period-luminosity (P-L) relation covering the entire period range
(0.40≤logP≤2.0) becomes steeper when moving from optical to
near-infrared (NIR) bands, and that the metallicity dependence of the
slope decreases from the B- to the K band. The sign of the metallicity
dependence for the slopes of the P-LV and P-LI relation is at odds
with some recent empirical estimates. We determined new homogeneous
estimates of V- and I-band slopes for 87 independent Cepheid data sets
belonging to 48 external galaxies with nebular oxygen abundance
7.5≤12+log(O/H)≤8.9. We investigated the dependence of the
period-Wesenheit (P-W) relations on the metal content and we found
that the slopes of optical and NIR P-W relations in external galaxies
are similar to the slopes of Large Magellanic Cloud (LMC) Cepheids.
They also agree with the theoretical predictions suggesting that the
slopes of the P-W relations are independent of the metal content.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sample.dat 31 50 Galaxy sample
table7.dat 29 52 Galaxy metal abundances
table8.dat 53 87 Slopes b(V) and b(I) of observed P-L relations
estimated using Cepheids with 0.5≤logP≤2.0
table15.dat 81 87 Distance moduli µ0(WVI) for the galaxies
listed in Table 8
refs.dat 164 41 References
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See also:
J/A+A/534/A94 : Milky Way Cepheids radial velocities (Storm+, 2011)
J/A+A/534/A95 : LMC Cepheids radial velocities (Storm+, 2011)
J/A+A/508/355 : Scaled solar tracks and isochrones (Bertelli+, 2009)
J/ApJS/183/109 : Cepheids in 3 host galaxies (Riess+, 2009)
J/ApJ/679/71 : Mid-IR period-luminosity relations (Freedman+, 2008)
J/A+A/476/73 : Calibration of Cepheid Period/Luminosity relation (Fouque+,
2007)
J/ApJ/647/1056 : ARAUCARIA project : NGC 6822 Cepheid variables (Gieren+, 2006)
J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004)
J/A+A/411/361 : VI photometry of extra-galactic Cepheids (Kanbur+, 2003)
J/A+A/404/423 : BVI photometry of Galactic Cepheids (Tammann+, 2003)
J/ApJS/142/71 : BVRI observations of LMC Cepheids (Sebo+, 2002)
J/AcA/51/221 : OGLE-II. Cepheids in IC 1613 (Udalski+, 2001)
J/A+AS/143/211 : Galactic Cepheids BVRI photometry (Berdnikov+, 2000)
J/A+AS/141/371 : Low-mass stars evolutionary tracks + isochrones (Girardi+,
2000)
http://www.ipac.caltech.edu/H0kp/ : HST Key Project on the extragalactic
distance scale home page
http://sites.google.com/site/araucariaproject/ : Araucaria Project home page
Byte-by-byte Description of file: sample.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Galaxy name
9- 10 I2 h RAh ? SIMBAD hour of right ascension (J2000)
12- 13 I2 min RAm ? SIMBAD minute of right ascension (J2000)
15- 19 F5.2 s RAs ? SIMBAD second of right ascension (J2000)
21 A1 --- DE- ? SIMBAD sign of declination (J2000)
22- 23 I2 deg DEd ? SIMBAD degree of declination (J2000)
25- 26 I2 arcmin DEm ? SIMBAD arcminute of declination (J2000)
28- 31 F4.1 arcsec DEs ? SIMBAD arcsecond of declination (J2000)
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Galaxy name
7 A1 --- f_Name Flag on name (G1)
9- 13 A5 --- r_Mold Reference for Mold (see refs.dat file)
15- 18 F4.2 [-] Mold Old metal abundance (12+log(O/H))
20- 23 F4.2 [-] e_Mold Uncertainty in Mold
25- 28 F4.2 [-] Mnew New metal abundance (12+log(O/H))
29 A1 --- f_Mnew [*] estimated Mnew (1)
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Note (1):
* = Estimated using the polynomial regression presented in Fig. 7
(see text for more details).
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Galaxy name
7- 8 A2 --- f_Name Flag on Name (G1)
10- 13 F4.2 [-] Met ? Metalicity
15- 19 F5.2 --- b(V) V band slope in P-L relationship
21- 24 F4.2 --- e_b(V) Uncertainty in b(V)
26- 30 F5.2 --- b(I) ? I band slope in P-L relationship
32- 35 F4.2 --- e_b(I) ? Uncertainty in b(I)
37- 41 F5.2 --- beta ? Slope of observed P-WVI relationship
43- 46 F4.2 --- e_beta ? Uncertainty in beta
48- 53 A6 --- Refs Reference(s) (see refs.dat file)
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Byte-by-byte Description of file: table15.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Galaxy name
9- 11 A3 --- n_Name Flag on Name (G1)
13- 18 A6 --- r_m-M Reference(s) on m-M (see refs.dat file)
20- 24 F5.2 mag LMCm-M ? LMC distance modulus adopted in the original
paper (r_m-M)
26- 30 F5.2 mag m-M ? Distance modulus
32- 35 F4.2 mag e_m-M ? Uncertainty in m-M
37- 41 F5.2 mag Fr01 ? Freedman et al. 2001ApJ...553...47F 2001ApJ...553...47F distance
modulus
43- 46 F4.2 mag e_Fr01 ? Uncertainty in Fr01
48- 52 F5.2 mag Ka03 ? Kanbur et al. 2003, Cat. J/A+A/411/361,
distance modulus
54- 57 F4.2 mag e_Ka03 ? Uncertainty in Ka03
59- 63 F5.2 mag STT06 ? Saha et al. 2006ApJS..165..108S 2006ApJS..165..108S distance
modulus
65 A1 --- f_STT06 [c] c: distance modulus from Sandage & Tammann
2008ApJ...686..779S 2008ApJ...686..779S
67- 70 F4.2 mag e_STT06 ? Uncertainty in STT06
72- 76 F5.2 mag Our ? Distance modulus from this paper
78- 81 F4.2 mag e_Our ? Uncertainty in Our
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ref Reference code
8- 26 A19 --- BibCode Bibcode
28- 47 A20 --- Aut Author's name(s)
49-164 A116 --- Comm Comment
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Global notes:
Note (G1):
i = inner field Cepheids;
o = outer field Cepheids;
* = <20 Cepheids.
a = Data from Freedman (1988ApJ...326..691F 1988ApJ...326..691F);
b = Data from Freedman et al. (1991ApJ...372..455F 1991ApJ...372..455F).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Apr-2012