The dependence of the brightness fluctuation distance indicator on stellar population age and metallicity

Details The dependence of the brightness fluctuation distance indicator on stellar population age and metallicity The dependence of the brightness fluctuation distance indicator on stellar population age and metallicity

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..530w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 530-536.

Astronomy and Astrophysics

Astrophysics

57

Cosmology, Distance, Metallicity, Stellar Evolution, Stellar Magnitude, Astronomical Models, Brightness, Galaxies

Scientific paper

We describe how the extragalactic distance indicator L(bar) depends on stellar population age, metallicity, and IMF, assuming single-burst ages between 5 and 17 Gyr and metallicities between -0.5 and +0.5 dex. We consider Johnson/Cousins BVR(C)I(C)JHKLL'M passbands. We find that (1) L(bar) is insensitive to changes in IMF, (2) L(bar) can be reliably calibrated against colors or spectral indices, due to the similarity of the effects of age and metallicity on the stellar populations, (3) the calibration presented here may already give distances good to 10 percent for an isolated galaxy measured in one fluctuation passband and one color or spectral index, not including observational error, and (4) our theoretical results are consistent with the distance of M32 and with the latest empirical I(bar) calibration and require no empirical corrections. We summarize our results by giving polynomial calibrations for M(bar) as functions of integrated Mg2, V - I, and J - K.

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