Skip to main content Accessibility help
×
Home

Ages and Metallicities of LMC Clusters and Their Surrounding Fields

  • Doug Geisler (a1), Eduardo Bica (a2), Horacio Dottori (a2), Juan J. Clariá (a3), Andrés E. Piatti (a3) and João F.C. Santos (a4)...

Abstract

We report on a survey of 25 candidate old LMC clusters. Washington photometry was obtained on the CTIO 0.9m in < 1 h , reaching below the turnoff. Ages based on the magnitude difference δT 1 between the giant branch clump and the turnoff revealed that no new old clusters were found. The candidates all turned out to be of intermediate age (1–3 Gyr). We confirm that there was apparently no cluster formation in the LMC from 3–9 Gyr ago, and that there was a pronounced epoch of cluster formation beginning 3 Gyrs ago that peaked at ~1.5 Gyrs ago. We also determine ages for the surrounding fields, as well as metallicities for both the clusters and fields from the color of the giant branch. In most cases the stellar population of each cluster is quite similar to that of its field. The mean metallicity for the intermediate age outer disk clusters is −0.65. A few clusters stand out in the age-metallicity relation in the sense that they are intermediate age clusters at relatively low metallicity. In the northern part of the LMC disk 3 fields all have a secondary clump ~0.45 mag fainter than the dominant clump, suggesting a component located behind the LMC at a distance comparable to that of the SMC.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Ages and Metallicities of LMC Clusters and Their Surrounding Fields
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Ages and Metallicities of LMC Clusters and Their Surrounding Fields
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Ages and Metallicities of LMC Clusters and Their Surrounding Fields
      Available formats
      ×

Copyright

References

Hide All
Bica, E., et al. 1996, ApJS, 102, 57
Bica, E., et al. 1998, AJ, 116, 723
Da Costa, G.S., & Armandroff, T.E. 1990 AJ, 100, 162
Geisler, D., et al. 1997, AJ, 114 1920
Geisler, D., & Sarajedini, A. 1999, AJ, 117, 308
Olszewski, E.W., et al. 1991, AJ, 101, 515

Ages and Metallicities of LMC Clusters and Their Surrounding Fields

  • Doug Geisler (a1), Eduardo Bica (a2), Horacio Dottori (a2), Juan J. Clariá (a3), Andrés E. Piatti (a3) and João F.C. Santos (a4)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed