On the Metallicity Dependence of Classical Cepheid Light Amplitudes

Autor:	Majaess, Daniel J., Turner, David G., Gieren, Wolfgang P., Berdnikov, Leonid N., Lane, David J.
Rok vydání:	2012
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - Solar and Stellar Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1007/s10509-012-1331-z
Popis:	Classical Cepheids remain a cornerstone of the cosmic distance scale, and thus characterizing the dependence of their light amplitude on metallicity is important. Period-amplitude diagrams constructed for longer-period classical Cepheids in IC 1613, NGC 3109, SMC, NGC 6822, LMC, and the Milky Way imply that very metal-poor Cepheids typically exhibit smaller V-band amplitudes than their metal-rich counterparts. The results provide an alternate interpretation relative to arguments for a null and converse metallicity dependence. The empirical results can be employed to check predictions from theoretical models, to approximate mean abundances for target populations hosting numerous long-period Cepheids, and to facilitate the identification of potentially blended or peculiar objects. Comment: To appear in ApSS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1211.4026 Zobrazit plný text záznamu View this record from Arxiv