Abstract
Physical parameters and radial pulsation modes are determined for three Delta Scuti stars in the Praesepe cluster: HD 73345, HD 73712, and HD 73746. Their agest and evolutionary massesM eare interpolated in the track systems of Iben (1967) and Paczyński (1970). By combining these age estimates with our previous results for nine other Delta Scuti-stars in the Praesepe cluster (Tsvetkov, 1989), the following weighted mean age estimates of this cluster are obtained: (14.2 ± 1.3) × 108 yr (Iben) and (5.4 ± 0.4) × 108 yr (Paczyński). Age and evolutionary mass estimates of the twelve cluster variables are also obtained in the modern track system of Maeder and Meynet (1988), in which the weighted mean cluster age is (15.3 ± 1.0) × 108 yr.
Pulsation massesM Qcalculated from the fitting formulae of Faulkner (1977) and Fitch (1981) as well as massesM g=gR 2 / G were evaluated for the twelve cluster variables by Tsvetkov (1990) or in the present paper. In most cases there is a satisfactory agreement between our estimates of massesM e,M g, andM Q.
Due to a large disagreement between the long period and low luminosity of the star HD 73746, its radial pulsation mode and pulsation massM Qcannot be evaluated.
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References
Breger, M.: 1970,Astrophys. J. 162, 597.
Breger, M.: 1974,Astrophys. J. 192, 75.
Breger, M.: 1977,Publ. Astron. Soc. Pacific 89, 55.
Breger, M.: 1979,Publ. Astron. Soc. Pacific 91, 5.
Breger, M.: 1990,Astron. Astroph. 240, 308.
Breger, M.: 1991,Astron. Astroph. 250, 107.
Breger, M., Balona, L.A., and Grothues, H.-G.: 1991,Astron. Astrophys. 243, 160.
Crawford, D.L.: 1970, in: A. Slettebak (ed.),Stellar Rotation, D. Reidel Publ. Co., Dordrecht, Holland, p. 204.
Faulkner, D.J.: 1977,Astroph. J. 218, 209.
Fitch, W.S.: 1981,Astroph. J. 249, 218.
García, J.R.et al.: 1988,Bull. Inform. CDS,34, 67.
Hauck, B. and Mermilliod, M.: 1990,Astron. Astroph. Suppl. 86, 107.
Iben, I.: 1967, Ann. Rev.Astron. Astroph. 5, 571.
Jackisch, G.: 1972,Astr. Nachr. 294, 1.
Kholopov, P.N.et al.: 1985,General Catalogue of Variable Stars (GCVS), 4th ed., Nauka, Moscow.
King, J.R.: 1990,Publ. Astron. Soc. Pacific 102, 658.
Lampens, P.: 1990,Delta Scuti Star Newsletter 2, 3.
Lampens, P.: 1991,Delta Scuti Star Newsletter 3, 20.
Maeder, A. and Meynet, G.: 1988,Astron. Astroph. Suppl. 76, 411.
Maeder, A. and Meynet, G.: 1989,Astron. Astroph. 210, 155.
Morton, D.C. and Adams, T.F.: 1968,Astroph. J. 151, 611.
Nieuwenhuijzen, H. and De Jager, C.: 1990,Astron. Astroph. 231, 134.
Paczyński, B.: 1970,Acta Astron. 20, 47.
Reimers, D.: 1975,Mém. Soc. Roy. Sci. Liège 8, 369.
Rolland, A.et al.: 1990,Inf. Bull. Var. Stars 3444.
Rolland, A.et al.: 1991,Delta Scuti Star Newsletter 4, 8.
Tsvetkov, Ts.G.: 1979,Inf. Bull. Var. Stars 1548.
Tsvetkov, Ts.G.: 1984,Inf. Bull. Var. Stars 2523.
Tsvetkov, Ts.G.: 1985,Astroph. Space Science 117, 137 (Paper I).
Tsvetkov, Ts.G.: 1986a,Astroph. Space Science 127, 219 (Paper II).
Tsvetkov, Ts.G.: 1986b,Astroph. Space Science 128, 319 (Paper III).
Tsvetkov, Ts.G.: 1988,Astroph. Space Science 150, 357.
Tsvetkou, Ts.G.: 1989,Astroph. Space Science 151, 47 (Paper IV).
Tsvetkov, Ts.G.: 1990,Astroph. Space Science 173, 1.
Tsvetkov, Ts.G. and Petrova, Ts.C.: 1993, “Masses and Ages of Delta Scuti Stars in Eclipsing Binary Systems”,Astroph. Space Science 203, 257–266.
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Tsvetkov, T.G. Ages and masses of delta scuti stars in the praesepe cluster. Astrophys Space Sci 203, 247–256 (1993). https://doi.org/10.1007/BF00658993
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DOI: https://doi.org/10.1007/BF00658993