Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters★
Corresponding Author
Ricardo Salinas
Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland
Based on data collected at the Danish Telescope at the ESO La Silla Observatory.
E-mail: [email protected]
Search for more papers by this authorLucie Jílková
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
Search for more papers by this authorGiovanni Carraro
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
Dipartimento di Astronomia, Universitá di Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy
Search for more papers by this authorMárcio Catelan
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Search for more papers by this authorPía Amigo
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Search for more papers by this authorCorresponding Author
Ricardo Salinas
Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland
Based on data collected at the Danish Telescope at the ESO La Silla Observatory.
E-mail: [email protected]
Search for more papers by this authorLucie Jílková
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
Search for more papers by this authorGiovanni Carraro
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
Dipartimento di Astronomia, Universitá di Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy
Search for more papers by this authorMárcio Catelan
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Search for more papers by this authorPía Amigo
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Search for more papers by this authorABSTRACT
We present BV photometry of four Sagittarius dwarf spheroidal galaxy globular clusters: Arp 2, NGC 5634, Palomar 12 and Terzan 8, obtained with the Danish Telescope at ESO La Silla. We measure the structural parameters of the clusters using a King profile fitting, obtaining the first reliable measurements of the tidal radius of Arp 2 and Terzan 8. These two clusters are remarkably extended and with low concentrations; with a concentration of only c= 0.41 ± 0.02, Terzan 8 is less concentrated than any cluster in our Galaxy.
Blue stragglers are identified in the four clusters, and their spatial distribution is compared to those of horizontal branch and red giant branch stars. The blue straggler properties do not provide evidence of mass segregation in Terzan 8, while Arp 2 probably shares the same status, although with less confidence. In the case of NGC 5634 and Palomar 12, blue stragglers are significantly less populous, and their analysis suggests that the two clusters have probably undergone mass segregation.
REFERENCES
- Alard C., 2001, A&A, 377, 389
- Barmby P., Holland S., Huchra J. P., 2002, AJ, 123, 1937
- Beccari G., Sollima A., Ferraro F. R., Lanzoni B., Bellazzini M., De Marchi G., Valls-Gabaud D., Rood R. T., 2011, ApJ, 737, L3
- Bellazzini M., Ferraro F. R., Ibata R., 2002, AJ, 124, 915
- Bellazzini M., Ferraro F. R., Ibata R., 2003, AJ, 125, 188
- Brown J. A., Wallerstein G., Zucker D., 1997, AJ, 114, 180
- Buonanno R., Corsi C. E., Pecci F. F., Richer H. B., Fahlman G. G., 1995, AJ, 109, 650
- Burbidge E. M., Sandage A., 1958, ApJ, 128, 174
- Cantiello M., Blakeslee J. P., Raimondo G., 2007, ApJ, 668, 209
- Carballo-Bello J. A., Gieles M., Sollima A., Koposov S., Martínez-Delgado D., Peñarrubia J., 2012, MNRAS, 419, 14
- Carney B. W., Latham D. W., Laird J. B., Grant C. E., Morse J. A., 2001, AJ, 122, 3419
- Carraro G., Seleznev A. F., 2011, MNRAS, 412, 1361
- Carraro G., Zinn R., Moni Bidin C., 2007, A&A, 466, 181
- Chernoff D. F., Djorgovski S., 1989, ApJ, 339, 904
- Clarkson W. I. et al., 2011, ApJ, 735, 37
- Cohen J. G., 2004, AJ, 127, 1545
- Correnti M., Bellazzini M., Dalessandro E., Mucciarelli A., Monaco L., Catelan M., 2011, MNRAS, 417, 2411
- Da Costa G. S., Armandroff T. E., 1995, AJ, 109, 2533
- Dalessandro E., Lanzoni B., Ferraro F. R., Vespe F., Bellazzini M., Rood R. T., 2008, ApJ, 681, 311
- Davies M. B., Benz W., Hills J. G., 1994, ApJ, 424, 870
- Dinescu D. I., Majewski S. R., Girard T. M., Cudworth K. M., 2000, AJ, 120, 1892
-
Djorgovski S., 1988, in
J. E. Grindlay,
A. G. D. Philip, eds, Proc. IAU Symp. 126, The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies. Kluwer,
Dordrecht
, p. 333
10.1007/978-94-015-1104-9_47 Google Scholar
- Djorgovski S., 1993, in S. G. Djorgovski, G. Meylan, eds, ASP Conf. Ser. Vol. 50, Structure and Dynamics of Globular Clusters. Astron. Soc. Pac., San Francisco , p. 373
- Dotter A. et al., 2010, ApJ, 708, 698
- Ferraro F. R., Lanzoni B., 2009, in E. Recillas, A. Luna, Y. D. Mayya, eds, Rev. Mex. Astron. Astrofis. Conf. Ser. Vol. 37, Probing the Link Between Dynamics and Stellar Evolution: Blue Straggler Stars in Globular Clusters, p. 62
- Ferraro F. R., Sollima A., Rood R. T., Origlia L., Pancino E., Bellazzini M., 2006, ApJ, 638, 433
- Ferraro F. R. et al., 2009, Nat, 462, 1028
- Forbes D. A., Bridges T., 2010, MNRAS, 404, 1203
- Giuffrida G., Sbordone L., Zaggia S., Marconi G., Bonifacio P., Izzo C., Szeifert T., Buonanno R., 2010, A&A, 513, A62
- Goldsbury R., Richer H. B., Anderson J., Dotter A., Sarajedini A., Woodley K., 2010, AJ, 140, 1830
- Harris W. E., 1991, AJ, 102, 1348
- Harris W. E., 1996, AJ, 112, 1487
- Hills J. G., Day C. A., 1976, ApJ, 17, L87
- Hwang N., Lee M. G., Lee J. C., Park W.-K., Park H. S., Kim S. C., Park J.-H., 2011, ApJ, 738, 58
- Ibata R. A., Gilmore G., Irwin M. J., 1994, Nat, 370, 194
- King I., 1962, AJ, 67, 471
- Kron G. E., Hewitt A. V., Wasserman L. H., 1984, PASP, 96, 198
- Landolt A. U., 1992, AJ, 104, 340
- Law D. R., Majewski S. R., 2010, ApJ, 718, 1128
- Layden A. C., Sarajedini A., 2000, AJ, 119, 1760
- Leonard P. J. T., 1989, AJ, 98, 217
- Leonard P. J. T., Livio M., 1995, ApJ, 447, L121
- McCrea W. H., 1964, MNRAS, 128, 147
- Mackey A. D., Gilmore G. F., 2003a, MNRAS, 338, 85
- Mackey A. D., Gilmore G. F., 2003b, MNRAS, 340, 175
- McLaughlin D. E., van der Marel R. P., 2005, ApJS, 161, 304
- Mapelli M., Sigurdsson S., Ferraro F. R., Colpi M., Possenti A., Lanzoni B., 2006, MNRAS, 373, 361
- Marín-Franch A. et al., 2009, ApJ, 694, 1498
- Martínez-Delgado D., Zinn R., Carrera R., Gallart C., 2002, ApJ, 573, L19
- Momany Y., Held E. V., Saviane I., Zaggia S., Rizzi L., Gullieuszik M., 2007, A&A, 468, 973
- Montegriffo P., Bellazzini M., Ferraro F. R., Martins D., Sarajedini A., Fusi Pecci F., 1998, MNRAS, 294, 315
- Mottini M., Wallerstein G., McWilliam A., 2008, AJ, 136, 614
- Odenkirchen M. et al., 2001, ApJ, 548, L165
- Palma C., Majewski S. R., Johnston K. V., 2002, ApJ, 564, 736
- Peñarrubia J., Walker M. G., Gilmore G., 2009, MNRAS, 399, 1275
- Peterson C. J., 1976, AJ, 81, 617
- Preston G. W., Sneden C., 2000, AJ, 120, 1014
- Rosenberg A., Saviane I., Piotto G., Held E. V., 1998, A&A, 339, 61
- Salinas R., Catelan M., Smith H. A., Pritzl B. J., Borissova J., 2005, Inf. Bull. Variable Stars, 5640, 1
- Sandage A. R., 1953, AJ, 58, 61
- Sandquist E. L., 2005, ApJ, 635, L73
- Scholz F., 2011, adk: Anderson-Darling K-Sample Test and Combinations of Such Tests
- Scholz F. W., Stephens M. A., 1987, J. Am. Stat. Assoc., 82, 918
- Siegel M. et al., 2011, ApJ, 743, 20
- Sollima A., Martínez-Delgado D., Valls-Gabaud D., Peñarrubia J., 2011, ApJ, 726, 47
- Stetson P. B., 1987, PASP, 99, 191
- Stetson P. B., 1993, in C. J. Butler, I. Elliott, eds, Proc. IAU Colloq. 136, Stellar Photometry – Current Techniques and Future Developments. Cambridge Univ. Press, Cambridge , p. 291
- Stetson P. B., 1994, PASP, 106, 250
- Stetson P. B., Hesser J. E., Smith G. H., Vandenberg D. A., Bolte M., 1989, AJ, 97, 1360
- Trager S. C., Djorgovski S., King I. R., 1993, in S. G. Djorgovski, G. Meylan, eds, ASP Conf. Ser. Vol. 50, Structure and Dynamics of Globular Clusters. Astron. Soc. Pac., San Francisco , p. 347
- Trager S. C., King I. R., Djorgovski S., 1995, AJ, 109, 218
- van den Bergh S., 2000, ApJ, 530, 777
- Walker A. R. et al., 2011, MNRAS, 415, 643
- Webbink R. F., 1985, in J. Goodman, P. Hut, eds, Proc. IAU Symp. 113, Dynamics of Star Clusters. Reidel, Dordrecht , p. 541
