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1998AJ....115..605L - Astron. J., 115, 605-634 (1998/February-0)
Magellanic cloud cepheids: abundances.
LUCK R.E., MOFFETT T.J., BARNES III T.G. and GIEREN W.P.
Abstract (from CDS):
The Magellanic Cloud Cepheids tend to be longer-period Cepheids (the period range examined was from 37 to 133 days), and thus have physical gravities (derived from the period-luminosity relation and an inferred mass) that are 1.0 dex and lower. Spectroscopic gravities (derived by forcing the total Fe content, as determined from Fe I and Fe II, to be equal) are even lower. Fortunately, the [Fe/H] content as determined from Fe I is not strongly dependent on gravity and is thus well determined.
We combine our abundances with other published high-resolution spectroscopic results, deriving a mean [Fe/H] for the SMC of -0.68 (σ = 0.13, n = 25). The total range seen in the [Fe/H] ratios derived herein is -0.84 to -0.65. This result is in agreement with previous studies showing a small intrinsic range in the metallicities in the SMC. For the LMC, from the Cepheids studied here we obtain -0.30 (σ = 0.12, n = 10), with a range of -0.55 to -0.19. Combining all available data, we obtain a mean [Fe/H] of -0.34 (σ = 0.15, n = 32). From this analysis, there is little evidence for a significant metallicity dispersion in the LMC.
Abstract Copyright: ∼
Journal keyword(s): Stars: Variables: Cepheids - Galaxies: Magellanic Clouds - Stars: Abundances - Stars: Atmospheres
Simbad objects: 32
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