The age of the Sculptor dwarf spheroidal galaxy from imaging with WFPC2
Por:
Monkiewicz J., Mould J.R., Gallagher III J.S., Clarke J.T., Trauger J.T., Grillmair C., Ballester G.E., Burrows C.J., Crisp D., Evans R., Griffiths R., Hester J.J., Hoessel J.G., Holtzman J.A., Krist J.E., Meadows V., Scowen P.A., Stapelfeldt K.R., Sahai R., Watson A.
Publicada:
1 ene 1999
Resumen:
From images taken with the hubble Space Telescope's WFPC2, we have obtained photometry of a field in the Sculptor dwarf spheroidal galaxy to 3 mag below the main-sequence turnoff. We determine an age equal to that of the earliest globular clusters for the bulk of the stars in our field of view. We attempt to constrain the star formation history of the Sculptor dwarf by examining the main-sequence luminosity function. The presence of a half-dozen blue straggler candidates blueward of the turnoff points to a possibly complex star formation history. However, the contribution of any intermediate-age population is difficult to measure conclusively, because of the uncertain origin of blue stragglers and the sparseness of the photometric sample.
Filiaciones:
Gallagher III J.S.:
Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706-1582, United States
Clarke J.T.:
Dept. of Atmosph., Oceanic, and S., University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
Trauger J.T.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Grillmair C.:
IPAC, California Institute of Technology, Pasadena, CA 91125, United States
Ballester G.E.:
Dept. of Atmosph., Oceanic, and S., University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
Burrows C.J.:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, United States
Crisp D.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Evans R.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Griffiths R.:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, United States
Hester J.J.:
Department of Physics, Carnegie-Mellon University, Wean Hall, 5000 Forbes Avenue, Pittsburgh, PA 15213, United States
Hoessel J.G.:
Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706-1582, United States
Holtzman J.A.:
Department of Astronomy, New Mexico State University, Box 30001, Las Cruces, NM 88003-8001, United States
Krist J.E.:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, United States
Meadows V.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Scowen P.A.:
Department of Physics and Astronomy, Arizona State University, Tyler Mall, Tempe, AZ 85287, United States
Stapelfeldt K.R.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Sahai R.:
Jet Propulsion Laboratory, Mail Stop 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
Watson A.:
Instituto de Astronomia-UNAM, 58090 Morelia, Michoacan, Mexico
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