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Beat Cepheids as Galactic Metallicity Tracers

Published online by Cambridge University Press:  15 August 2009

J.R. Buchler
Affiliation:
University of Florida, Gainesville, FL, USA
R. Szabó
Affiliation:
Konkoly Observatory, Budapest, Hungary
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Abstract

We give a brief overview of Cepheids and of their modeling, with particular emphasis on F/O1 Beat Cepheids. Then we revisit the use of Period Ratio vs. Period diagram (Petersen diagram) for fundamental/first overtone Beat Cepheids, because they allow one to put very tight constraints on their metallicity Z. The Petersen diagram is shown to be largely independent of the helium content Y, of the mass-luminosity relation that is used in their construction, and of stellar rotation rates. However, it shows sensitivity to the chemical makeup of the elements that are lumped into the metallicity parameter Z. The Petersen diagram for the new Asplund, M., Grevesse, N., & Sauval, A.J. (2005, ASP Conf. Ser., 336, 25) solar mix is compared to that for for the older, “standard” solar mix of Grevesse, N., & Noels, A., (1993).

Type
Research Article
Copyright
© EAS, EDP Sciences, 2009

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References

Alexander, D.R., & Ferguson, J.W., 1994, ApJ, 437, 879 CrossRef
Asplund, M., Grevesse, N., & Sauval, A.J., 2005, ASP Conf. Ser., 336, 25
Beaulieu, J.P., Buchler, J.R., Marquette, J.B., Hartman, J.D., & Schwarzenberg-Czerny, A., 2006, ApJ, 653, L101 CrossRef
Buchler, J.R., & Goupil, M.J., 1984, ApJ, 279, 394 CrossRef
Buchler, J.R., & Kolláth, Z., 2001, ApJ, 255, 961 CrossRef
Buchler, J.R., Yecko, P.E., & Kolláth, Z., 1997, A&A, 326, 669
Buchler, J.R., 1993, A Dynamical Systems Approach to Nonlinear Stellar Pulsations, in Nonlinear Phenomena in Stellar Variability, ed. M. Takeuti & J.R. Buchler, Ap&SS, 210, 1
Buchler, J.R., 2008, ApJ, 680, 1412 CrossRef
Buchler, J.R., & Kolláth, Z., 2002, ApJ, 573, 324 CrossRef
Buchler, J.R., & Kovács, G., 1986, ApJ, 308, 661; ApJ, 318, 232 CrossRef
Buchler, J.R., & Szabó, R., 2007, ApJ, 660, 723 CrossRef
Buchler, J.R., Wood, P.R., Keller, S., & Soszyński, I., 2005, ApJ, 631, L151 CrossRef
Buchler, J.R., Wood, P.R., & Soszyński, I., 2009, ApJ, 696 (in press)
Christensen-Dalsgaard, J., & Petersen, J.O., 1995, A&A, 299, L17
Cordier, D., 2000, Thèse de Doctorat, Université de Rennes, France, http://astro.ensc-rennes.fr/
Girardi, L., Bressan, A., Bertelli, G., & Chiosi, C., 2000, A&AS, 141, 371
Grevesse, N., & Noels, A., 1993, in Origin and evolution of the elements, ed. N. Prantzos, E. Vangioni-Flam and M. Casse (Cambridge Univ. Press, Cambridge, England), 14
Iglesias, C.A., & Rogers, F.J., 1996, ApJ, 464, 943, www-pat.llnl.gov/Research/OPAL/ CrossRef
Kolláth, Z., Beaulieu, J.P., Buchler, J.R., & Yecko, P., 1998, ApJ, 502, L5 CrossRef
Kolláth, Z., Buchler, J.R., Szabó, R., & Csubry, Z., 2002, A&A, 385, 932
Moskalik, P., & Kolaczkowski, Z., 2009, MNRAS, 394, 1649 CrossRef
Petersen, J.O., 1973,A&A, 27, 89
Stellingwerf, R.F., 1975, ApJ, 195, 441 CrossRef
Szabó, R., & Buchler, J.R., 2009, ApJ, submitted
Suarez, J.C., Garido, R., & Goupil, M., 2006,A&A, 447, 649
Yecko, P.A., Kolláth, Z., & Buchler, J.R., 1998,A&A, 336, 553