Upper Main Sequence Stars with Anomalous Abundances. The HGMN Stars HR 3273, HR 8118, HR 8567 and HR 8937
C. Saffe, N. Núñez, and H. Levato
Instituto de Ciencias Astronómicas, de la Tierra y del Espacio (ICATE) and Facultad de Ciencias Exactas, Físicas y Naturales Universidad Nacional de San Juan, Argentina. (hlevato@icate–conicet.gob.ar).
Received 2010 December 13
Accepted 2011 April 14
RESUMEN
Este trabajo es parte de un estudio para verificar posibles tendencias de las abundancias en estrellas HgMn con los parámetros estelares, rotación y edad. Presentamos un análisis de las estrellas HR 3273, HR 8118, HR 8567 y HR 8937. Utilizamos espectros echelle tomados con el telescopio de 2.1 m del CASLEO y modelos de atmósferas de ATLAS9. El He resultó por debajo del valor solar para las estrellas HgMn. El O resultó levemente sobreabundante en HR 3273 y HR 8567. MgII resultó por debajo excepto para HR 8118. El SiII resultó aproximadamente solar en HR 8118 y HR 8937, y por debajo en HR 3273 y HR 8567. El Fe resultó levemente sobreabundante en HR 8118 y HR 8937 y subabundante en HR 3273 y HR 8567. Las especies Sc, Ti, Cr, Mn, Sr, Y y Zr resultaron sobreabundantes mientras que el Ni resultó estar por debajo del valor solar.
ABSTRACT
This work is part of our current study for verifying a possible relation between abundances of HgMn stars with stellar parameters, rotation and age. We present an analysis of the stars HR 3273, HR 8118, HR 8567 and HR 8937. We used echelle spectra taken with the CASLEO 2.1 m telescope and ATLAS9 model atmospheres. HeI was underabundant for the HgMn stars. O was slightly underabundant in HR 3273 and HR 8567. MgII was underabundant except for HR 8118. SiII was close to solar in HR 8118 and HR 8937, and underabundant in HR 3273 and HR 8567. Fe was slightly underabundant in HR 3273 and HR 8567, and slightly overabundant in HR 8118 and HR 8937. The species Sc, Ti, Cr, Mn, Sr, Y and Zr were overabundant while Ni was underabundant.
Key Words: stars: chemically peculiar — stars: individual (HR 3273, HR8118, HR 8567, HR 8937).
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]]> ACKNOWLEDGMENTS
The authors acknowledge the use of the CCD and data reduction acquisition system supported by US NSF Grant AST 90–15827 to R. M. Rich. The authors thank Drs. R.L. Kurucz and I. Hubeny for making their codes available to them. This work was partially supported by a grant PICT 20269 from Agencia Nacional de Promoción Científica y Tecnológica.
REFERENCES
Abt, H., & Golson, J. 1962, ApJ, 136, 35. [ Links ]
Abt, H., Chaffee, F. H., & Suffolk, G. 1972, ApJ, 175, 779. [ Links ]
Adelman, S. J., & Pintado, O. 1997, A & AS, 125, 219. [ Links ]
]]>Adelman, S. J., & Rayle, K. E. 2000, A & A, 355, 308. [ Links ]
Adelman, S. J., & Yüce, K. 2010, Astron. Nachr., 331, 785. [ Links ]
Andersen, J., & Nordström, B. 1977, A & AS, 29, 309. [ Links ]
Auriére, M., et al. 2007, A & A, 475, 1053. [ Links ]
Auriére, M., et al. 2010, A & A, 523, 40. [ Links ]
]]>Bertaud, C. 1958, J. Obs., 42, 45. [ Links ]
Corben, P. M. 1971, Mon. Not. Astron. Soc. S. Afr., 30, 37. [ Links ]
Corben, P. M., & Stoy, R. H. 1968, Mon. Not. Astron. Soc. S. Afr., 27, 11. [ Links ]
Cousins, A., & Stoy, R. 1962, Royal Greenwich Obs. Bull., 64, 103. [ Links ]
Cowley, A. P., Cowley, C. R., Hiltner, W., Jaschek, M., & Jaschek, C. 1968, PASP, 80, 746. [ Links ]
]]>Cowley, A. P., Cowley, C. R., Jaschek, M., & Jaschek, C. 1969, AJ, 74, 375. [ Links ]
Crawford, D. L. 1963, ApJ, 137, 530. [ Links ]
Crawford, D. L., Barnes, J. V., & Golson, C. 1970, AJ, 75, 624. [ Links ]
Cutri, R., et al. 2003, he IRSA 2MASS All–Sky Point Source Catalog, NASA/IPAC Infrared Science Archive http://irsa.ipac.caltech.edu/applications/Gator/. [ Links ]
Chapelle, J., & Sahal–Brechot, S. 1970, A & A, 6, 415. [ Links ]
]]>Dolk, L., Wahlgren, G. M., & Hubrig, S. 2003, A & A, 402, 299. [ Links ]
Dworetsky, M. M. 1971, PhD Thesis, University of California, USA. [ Links ]
Eggen, O. 1977, PASP, 89, 205. [ Links ]
Fuhr, J. R., Martin, G. A., & Wiese, W. L. 1988, J. Phys. Chem. Ref. Data, 17, Suppl. 4. [ Links ]
Fuhr, J. R., & Wiese, W. L. 2006, J. Phys. Chem. Ref. Data, 35, 1669. [ Links ]
]]>Glagolevskij, Yu. V. 1994, Bull. Spec. Astrophys. Obs., 38, 152. [ Links ]
Grevesse, N., Noels, A., & Sauval, A. 1996, in ASP Conf. Ser. 99, Cosmic Abundances, ed. S. Holt & G. Sonneborn (San Francisco: ASP), 117. [ Links ]
Gronbech, B., & Olsen, E. H. 1976, A & AS, 25, 213. [ Links ]
––––––––––. 1977, A & AS, 27, 443. [ Links ]
Guthrie, B. N. 1985, MNRAS, 216, 1. [ Links ]
]]>Hauck, B., & Mermilliod, M. 1998, A & AS, 129, 431. [ Links ]
Houk, N. 1982, Michigan Catalogue of Two–Dimensional Spectral Types for the HD Stars, Vol. 3 (Ann Arbor: Univ. Michigan Dept. Astron. [ Links ]).
Hubrig, S., & Mathys, G. 1995, in ASP Conf. Ser. 81, Laboratory and Astronomical High Resolution Spectra, ed. A. J. Sauval, R. Blomme, & N. Grevesse (San Francisco: ASP), 555. [ Links ]
Iglesias, L., & Velasco, R. 1964, Publ. Inst. Opt. Madrid, No. 23. [ Links ]
Irwin, J. B. 1961, ApJS, 6, 253. [ Links ]
]]>Johansson, S. 1978, Phys. Scr., 18, 217. [ Links ]
Jomaron, C. M., Dworetsky, M. M., & Allen, C. S. 1999, MNRAS, 303, 555. [ Links ]
Kurucz, R. L., & Avrett, E. H. 1981, SAO Spec. Rep., 391. [ Links ]
Kurucz, R. L., & Bell, B. 1995, Atomic Line Data, Kurucz CD–ROM No. 23 (Cambridge: SAO). [ Links ]
Lanz, T., Dimitrijevic, M. S., & Artru, M. C. 1988, A & A, 192, 249. [ Links ]
]]>Makaganiuk, V., et al. 2011, A & A, 525, 97. [ Links ]
Moon, T. T., & Dworetsky, M. 1985, MNRAS, 217, 305. [ Links ]
Moore, C. E. 1945, A Multiplet Table of Astrophysical Interest (Princeton: Princeton Univ. Obs. [ Links ]).
Napiwotzki, R., Shonberner, D., & Wenske, V. 1993, A & A, 268, 653. [ Links ]
Nilsson, A., Johansson, S., & Kurucz, R. L. 1991, Phys. Scr., 44, 226. [ Links ]
]]>Pintado, O. I., & Adelman, S. J. 2003, A & A, 406, 987. [ Links ]
Piskunov, N. E. 1996, in ASP Conf. Ser. 108, Model Atmosphere and Spectrum Synthesis, ed. S. J. Adelman, F. Kupka, & W. W. Weiss (San Francisco: ASP), 307. [ Links ]
Reader, J., Corliss, C. H., Wiese, W. L., & Martin, G. A. 1980, Wavelengths and Transition Probabilities for Atoms and Atomic Ions, Part 1 (NSRDS–NBS 68; Washington: NBS). [ Links ]
Renson, P., & Manfroid, J. 2009, A & A 498, 961. [ Links ]
Rybka, E. 1969, Acta Astron., 19, 229. [ Links ]
]]>Saffe, C., & Levato, H. 2009, RevMexAA, 45, 171. [ Links ]
Saffe, C., Levato, H., & López–García, Z., 2004, RevMexAA, 40, 231. [ Links ]
––––––––––. 2005, RevMexAA, 41, 415. [ Links ]
Sahal–Brechot, S. 1969, A & A, 2, 322. [ Links ]
Schneider, H. 1981, A & AS, 44, 137. [ Links ]
]]>Smith, K. C. 1997, A & A, 319, 928. [ Links ]
Smith, K. C., & Dworetsky, M. M. 1993, A & A, 274, 335. [ Links ]
Strauss, F. M., & Ducati, J. R. 1981, A & AS, 44, 337. [ Links ]
Svendenius, N., Magnusson, C. E., & Zetterberg, P. O.1983, Phys. Scr., 27, 339. [ Links ]
Woolf, V. M., & Lambert, D. L. 1999, ApJ, 521, 414. [ Links ]
]]>Wolff, S., & Wolff, R. 1974, ApJ, 194, 65. [ Links ]
Zavala, R. T., et al. 2007, ApJ, 655, 1046. [ Links ]
]]>