DOI: https://doi.org/10.18524/1810-4215.2001.14.99503

THREE CEPHEIDS IN GALACTIC OPEN CLUSTERS: CHEMICAL COMPOSITION AND EVOLUTION

I. A. Usenko, V. V. Kovtyukh

Анотація


Three classical Cepheids in galactic open clusters (CF Cas, DL Cas and WZ Sgr) were investigated, using high-resolution CCD spectra. Their Teff and EB-V estimations have a good agreement with photometrically determined ones. CF Cas and DL Cas have metallicity values, close to those of the Sun, whereas WZ Sgr has overabundant metallicity content with Z=0.029. Chemical abundance data show that they are the post first dredge-up stars. C and O content and ages have a good agreement with the theoretically predicted values. All these objects have a good fit with the PL relation for galactic Cepheids.

Ключові слова


Stars; abundances; stars; Cepheids in open clusters; stars; individual; CF Cas; DL Cas; WZ Sgr.

Повний текст:

PDF (English)

Посилання


Antonello E., Morelli P.L.: 1996, As.Ap., 314, 541

Berdnikov L.N.: 1987, Perem. Zvezdy, 22, 530

Bessel M.S., Castelli F., Plez B.: 1998, As.Ap., 333, 231

Chiosi C, Wood P.R., Bertelli G., Bressan A., Mateo M.: 1992, Ap.J., 385, 205

Galazutdinov G.A.: 1992, Preprint SAO RAS No. 92

Gieren W.P., Barnes T.G., Moffit T.J.: 1993, Ap.J., 418, 135

Gieren W.P., Welch D.L., Mermillod J.C., Matthews J.M., Hertling G.: 1994, A.J., 107, 2093

Gray D.: 1992, "Observation and Analysis of Stellar Photospheres", Cambrige Univ. Press, 2nd Edition.

Kovtyukh V.V., Andrievsky S.M.: 1999, As.Ap., 351, 597

Kovtyukh V.V., Gorlova N.I.: 2000, As.Ap., 358, 587

Kurucz R.L.: 1992, The Stellar Populations of Galaxies, B. Barbuy, A. Renzini (eds.), IAU Symp., 149, 225.

Matthews J.M., Gieren W.P., Mermillod J.C., Welch D.L.: 1995, A.J., 110, 2280

Schaller G., Schaere D., Meynet G., Maeder A.: 1992, As.Ap.Suppl., 96, 269

Turner D.G.: 1992, A. J, 104, 1865

Turner D.G., van den Bergh S., Younger P.F., Danks T.A, Forbes D.: 1993, Ap.J.S., 85, 119




Copyright (c) 2017 Odessa Astronomical Publications

Creative Commons License
Ця робота ліцензована Creative Commons Attribution-NonCommercial 4.0 International License.