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arXiv:0711.3988 (astro-ph)
[Submitted on 26 Nov 2007]

Title:Cepheids as tracers of the metallicity gradient across the Galactic disk

Authors:B. Lemasle, A. Piersimoni, S. Pedicelli, G. Bono, P. Francois, F. Primas, M. Romaniello
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Abstract: We present iron abundance measurements, based on high resolution spectroscopy, and accurate distance determinations, based on near infrared photometry, for 34 Galactic Cepheids. The new data are used to constrain the Galactic iron abundance gradient in the outer disk, namely from 10 to 14 kpc. We confirm the flattening of the gradient toward the outer disk. In this region we also found an increase in the metallicity dispersion. Current data do not support the occurrence of a jump in the metallicity gradient for Galactocentric distances of the order of 10-12 kpc.
Comments: 5 pages, 2 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0711.3988 [astro-ph]
  (or arXiv:0711.3988v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.3988

Submission history

From: Bertrand Lemasle [view email]
[v1] Mon, 26 Nov 2007 16:03:48 UTC (49 KB)
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