Galactic globular and open cluster fiducial sequences in the Pan-STARRS1 photometric system

Edouard J. Bernard, Annette M. N. Ferguson, Edward F. Schlafly, Imants Platais, Eric F. Bell, Nicolas F. Martin, Hans-Walter Rix, Colin T. Slater, William S. Burgett, Kenneth C. Chambers, Peter W. Draper, Klaus W. Hodapp, Nicholas Kaiser, Rolf-Peter Kudritzki, Eugene A. Magnier, Nigel Metcalfe, John L. Tonry, Richard J. Wainscoat, Christopher Waters

Research output: Contribution to journalArticlepeer-review

Abstract

We present the fiducial sequences of a sample of Galactic star clusters in the five bands of the Pan-STARRS1 (PS1) photometric system (g(P1), r(P1), i(P1), z(P1), and y(P1)). These empirical sequences - which include the red giant and sub-giant branches, the main sequence, and the horizontal branch - were defined from deep colour-magnitude diagrams reaching below the oldest main-sequence turn-offs of 13 globular and 3 old open clusters covering a wide range of metallicities ( - 2.4 a parts per thousand(2) [Fe/H] a parts per thousand(2) +0.4). We find excellent agreement for the nine clusters in common with previous studies in similar photometric systems when transformed to the PS1 system. Because the photometric and spectroscopic properties of these stellar populations are accurately known, the fiducials provide a solid basis for the interpretation of observations in the PS1 system, as well as valuable constraints to improve the empirical colour-T-eff relations.

Original languageEnglish
Pages (from-to)2999-3009
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number4
DOIs
Publication statusPublished - 21 Aug 2014

Keywords

  • surveys
  • stars: evolution
  • Hertzsprung-Russell and colour-magnitude diagrams
  • globular clusters: general
  • open clusters and associations: general
  • DIGITAL SKY SURVEY
  • STELLAR POPULATION SEQUENCES
  • SYNOPTIC SURVEY TELESCOPE
  • PAN-STARRS
  • ACS SURVEY
  • CATALOG

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