Reddening and Age for 12 Concentrated Large Magellanic Cloud Clusters Determined from Integrated Spectroscopy

• Autorzy: Palma T. , Ahumada A. V. , Clariá J. J. , Santos Jr. J. F. C. , Bica E.
• Języki publikacji: EN

Abstrakty

EN

We present flux-calibrated integrated spectra in the optical range (3700-6800 å) for a sample of 12 concentrated Large Magellanic Cloud (LMC) star clusters, five of which do not have previous age and reddening determinations. We estimate simultaneously age and foreground reddening by comparing the continuum distribution and line strengths of the cluster spectra with those of template spectra. Cluster reddening values and ages are also derived from the available interstellar extinction maps and from the equivalent width (EW) method, respectively. The latter includes the use of age/metallicity calibrations and diagnostic diagrams involving the sum of EWs of selected spectral lines. In general, cluster ages derived from both methods show good agreement and range from 40 Myr to 800 Myr, while the foreground reddening values vary from E(B-V)= 0.0 mag to 0.16 mag. The present cluster sample complements previous ones, in an effort to create a spectral library for the LMC with several clusters per age bin.

Słowa kluczowe

EN

Galaxies: star clusters; Techniques: spectroscopic; Magellanic Clouds

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2008
• Tom: Vol. 58, No. 4
• Strony: 359--372
• Opis fizyczny: Bibliogr. 38 poz., rys., tab., wykr.

Twórcy

autor

Palma T.

• Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, 5000, Córdoba, Argentina
• CONICET, Argentina

autor

Ahumada A. V.

• European Southern Observatory, Alonso de Córdova 3107, Santiago, Chile
• Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, 5000, Córdoba, Argentina
• CONICET, Argentina

autor

Clariá J. J.

• Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, 5000, Córdoba, Argentina
• CONICET, Argentina

autor

Santos Jr. J. F. C.

• Depto. de Física, ICEx, UFMG, CP 702, 30123-970, Belo Horizonte, MG, Brazil

autor

Bica E.

• Depto. de Astronomia, UFRGS, CP 15051, 91500-970, Porto Alegre, Brazil

Bibliografia

• Baume, G., Moitinho, A., Giorgi, E.E., Carraro, G., and Vázquez, R.A. 2004, A&A, 417, 961.
• Bhatia, R.K. 1992, Mem. Soc. Astron. Ital., 63, 141.
• Bhatia, R.K., Read, M.A., Hatzidimitriou, D., and Tritton, S, 1991, A&AS, 87, 335.
• Bhatia, R.K., and Hatzidimitriou, D. 1988, MNRAS, 230, 215.
• Bica, E., and Alloin, D. 1986a, A&A, 162, 21.
• Bica, E., and Alloin, D. 1986b, A&AS, 66, 121.
• Bica, E., Bonatto, C., Dutra, C.M., and Santos Jr., J.F.C. 2008, MNRAS, 389, 678.
• Bica, E., Clariá, J.J., Dottori, H., Santos Jr., J.F.C., and Piatti, A.E. 1996, ApJS, 102, 57.
• Bica, E., Geisler, D., Dottori, H., Piatti, A.E., Clariá, J.J., and Santos Jr., J.F.C. 1998, AJ, 116, 723.
• Bica, E., Schmitt, H.R., Dutra, C.M., and Oliveira, H.L. 1999, AJ, 117, 238.
• Burstein, D., and Heiles, C. 1982, AJ, 87, 1165.
• Dirsch, B., Richtler, T., Gieren, W.P., and Hilker, M. 2000, A&A, 360, 133.
• Elson, R.A, and Fall, M. 1985, AJ, 299, 211.
• Hilker, M., Richtler, T., and Stein, W.P. 1995, A&A, 299, L37.
• Hodge, P. 1960, ApJ, 131, 351.
• Hodge, P. 1988, PASP, 100, 1051.
• Kontizas, M., Morgan, D.H., Hatzidimitriou, D., and Kontizas, E. 1990, A&AS, 84, 527.
• Lauberts, A. 1982, “The ESO/Uppsala Survery of the ESO (B) Atlas”, European Southern Observatory, Garching.
• Lynga, G., and Westerlund, B.E. 1963, MNRAS, 127, 311.
• Mighell, K.J., Sarajedini, A., and French, R.S. 1998, AJ, 116, 2395.
• Minniti, D., Clariá, J.J., and Gómez, M. 1989, Ap&SS, 158, 9.
• Piatti, A.E., Bica, E., Clariá, J.J., Santos Jr., J.F.C., and Ahumada, A.V. 2002, MNRAS, 335, 233.
• Piatti, A.E., Clariá, J.J., Mermilliod, J.-C., Parisi, M.C., and Ahumada, A.V. 2007, MNRAS, 377, 1737.
• Pietrzyński, G., and Udalski, A. 2000, Acta Astron., 50, 337.
• Pietrzyński, G., Udalski, A., Kubiak, M., Szymański, M., Wozniak, P., and Żerbuń, K. 1999, Acta Astron., 49, 521.
• Portegies Zwart, S.F., and Rusli, S.P. 2007, MNRAS, 374, 931.
• Rich, R.M., Shara, M., Fall, S.M., and Zurek, D. 2000, AJ, 119, 197.
• Santos Jr., J.F.C., and Piatti, A.E. 2004, A&A, 428, 79.
• Santos Jr., J.F.C., Clariá, J.J., Ahumada, A.V., Bica, E., Piatti, A.E. and Parisi, M.C. 2006, A&A, 448, 1023.
• Searle, L., Wilkinson, A., and Bagnuolo, W.G. 1980, AJ, 239, 80.
• Seaton, M.J. 1979, MNRAS, 187, 73.
• Shapley, H, and Lindsay, E.M. 1963, Ir. Astron. J., 6, 174.
• Schlegel, D.J., Finkbeiner, D.P., and Davis, M. 1998, ApJ, 500, 525.
• Schmidt, A. 1988, “SPEED User’s Manual”, Univ. Federal do Santa Maria, Brazil.
• Stein, D., Hilker, M., and Richtler, T. 1994, Astron. Gesellschaft Abstract Ser., 10, 198.
• Stone, R.P.S., and Baldwin, J.A. 1983, MNRAS, 204, 347.
• Talavera, M.L., Ahumada, A.V., Clariá, J.J., Parisi, M.C., Santos Jr., J.F.C., and Bica, E. 2006, Bol. Asoc. Argentina Astron., 49, 311.
• Talavera, M.L., Ahumada, A.V., Clariá, J.J., Santos Jr., J.F.C., Bica, E., and Parisi, M.C. 2007, Bol. Asoc. Argentina Astron., 50, 157.