The Age of the Sculptor Dwarf Spheroidal Galaxy from Imaging with WFPC21
From images taken with theHubble 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....
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Veröffentlicht in: | Publications of the Astronomical Society of the Pacific 1999-11, Vol.111 (765), p.1392-1397 |
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creator | Monkiewicz, Jackie Mould, Jeremy R. Gallagher III, John S. Clarke, John T. Trauger, John T. Grillmair, Carl Ballester, Gilda E. Burrows, Christopher J. Crisp, David Evans, Robin Griffiths, Richard Hester, J. Jeff Hoessel, John G. Holtzman, Jon A. Krist, John E. Meadows, Vicki Scowen, Paul A. Stapelfeldt, Karl R. Sahai, Ragvendra Watson, Alan |
description | From images taken with theHubble 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. |
doi_str_mv | 10.1086/316447 |
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Jeff ; Hoessel, John G. ; Holtzman, Jon A. ; Krist, John E. ; Meadows, Vicki ; Scowen, Paul A. ; Stapelfeldt, Karl R. ; Sahai, Ragvendra ; Watson, Alan</creator><creatorcontrib>Monkiewicz, Jackie ; Mould, Jeremy R. ; Gallagher III, John S. ; Clarke, John T. ; Trauger, John T. ; Grillmair, Carl ; Ballester, Gilda E. ; Burrows, Christopher J. ; Crisp, David ; Evans, Robin ; Griffiths, Richard ; Hester, J. Jeff ; Hoessel, John G. ; Holtzman, Jon A. ; Krist, John E. ; Meadows, Vicki ; Scowen, Paul A. ; Stapelfeldt, Karl R. ; Sahai, Ragvendra ; Watson, Alan</creatorcontrib><description>From images taken with theHubble 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.</description><identifier>ISSN: 0004-6280</identifier><identifier>EISSN: 1538-3873</identifier><identifier>DOI: 10.1086/316447</identifier><language>eng</language><publisher>The University of Chicago Press</publisher><subject>Astronomical photometry ; Carbon stars ; Dwarf spheroidal galaxies ; Galaxy formation ; Main sequence stars ; Milky Way Galaxy ; Sculptors ; Star formation ; Stars ; Stellar populations</subject><ispartof>Publications of the Astronomical Society of the Pacific, 1999-11, Vol.111 (765), p.1392-1397</ispartof><rights>1999. 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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.</description><subject>Astronomical photometry</subject><subject>Carbon stars</subject><subject>Dwarf spheroidal galaxies</subject><subject>Galaxy formation</subject><subject>Main sequence stars</subject><subject>Milky Way Galaxy</subject><subject>Sculptors</subject><subject>Star formation</subject><subject>Stars</subject><subject>Stellar populations</subject><issn>0004-6280</issn><issn>1538-3873</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNqNjs0KgkAURocoyP6e4UJr617HdLZhme0ChZYylL9oymiYb59RD9DqfIvDx2FsRbghFNaWk2Wa9ohptONC58LmY6YhoqlbhsApmzVNjkgkCDXmBWkE-ySCKoZ2mP7tWdRtpeDQSRWDX6eRqrK7LOAkC_nqIVZVCedSJtkjgS5rU7i6F8egBZvEsmii5Y9ztnaPgePpeTPchbXKSqn6kDD8RIbfSP6f9QaJDz0S</recordid><startdate>199911</startdate><enddate>199911</enddate><creator>Monkiewicz, Jackie</creator><creator>Mould, Jeremy R.</creator><creator>Gallagher III, John S.</creator><creator>Clarke, John T.</creator><creator>Trauger, John T.</creator><creator>Grillmair, Carl</creator><creator>Ballester, Gilda E.</creator><creator>Burrows, Christopher J.</creator><creator>Crisp, David</creator><creator>Evans, Robin</creator><creator>Griffiths, Richard</creator><creator>Hester, J. 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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.</abstract><pub>The University of Chicago Press</pub><doi>10.1086/316447</doi></addata></record> |
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subjects | Astronomical photometry Carbon stars Dwarf spheroidal galaxies Galaxy formation Main sequence stars Milky Way Galaxy Sculptors Star formation Stars Stellar populations |
title | The Age of the Sculptor Dwarf Spheroidal Galaxy from Imaging with WFPC21 |
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