SIMBAD references

2013ApJ...777...79M - Astrophys. J., 777, 79 (2013/November-1)

The metallicity dependence of the cepheid P - L relation in M101.


Abstract (from CDS):

The impact of metallicity on the Cepheid period-luminosity (P - L) relation is investigated using Hubble Space Telescope Advanced Camera for Surveys V and I images of M101. Variations in the reddening-free Wesenheit parameter (W), which is employed as a proxy for luminosity, are examined as a function of the radial distance from the center of M101 (and thus metallicity). We determine that there is no dependence of the slope on metallicity. However, the intercept is found to depend on metallicity by γVI= -0.33 ±0.12 mag.dex–1 and γVI= -0.71±0.17 mag.dex–1 using 2σ and 3σ rejection criteria, respectively. Sigma-clipping impacts the derived metallicity dependence, and the 2σ criterion applied likely mitigates blending, particularly in the crowded inner regions of M101. A metallicity-corrected distance for M101 is obtained from 619 Cepheids (µ = 28.96±0.11), a result that agrees with the recently determined SN Ia distance. The metallicity effects described can be bypassed by working at near and mid-infrared wavelengths (e.g., the Carnegie Hubble Program).

Abstract Copyright:

Journal keyword(s): galaxies: distances and redshifts - galaxies: individual: M101 - stars: variables: Cepheids

VizieR on-line data: <Available at CDS (J/ApJ/777/79): table1.dat>

Nomenclature: Table 1 : [MMF2013] F1 chN-N-sNNNN (Nos 1-1-s0001 to s0092, 1-2-s0002 to s0221, 2-1-s0004 to s0141, 2-2-s0003 to s0158), [MMF2013] F2 chN-N-sNNNN (Nos 1-1-s0005 to s0353, 1-2-s0002 to s0211, 2-1-s0001 to s0126, 2-2-s0001 to s0110).

Simbad objects: 628

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