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

Bernard, E.J.; Ferguson, A.M.N.; Schlafly, E.F.; Platais, I.; Bell, E.F.; Martin, N.F.; Rix, H.-W.; Slater, C.T.; Burgett, W.S.; Chambers, K.C.; Draper, P.W.; Hodapp, K.W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E.A.; Metcalfe, N.; Tonry, J.L.; Wainscoat, R.J.; Waters, C.

Abstract

We present the fiducial sequences of a sample of Galactic star clusters in the five bands of the Pan-STARRS1 (PS1) photometric system (gP1, rP1, iP1, zP1, and yP1). 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 ≲ [Fe/H] ≲ +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–Teff relations.

Citation

Bernard, E., Ferguson, A., Schlafly, E., Platais, I., Bell, E., Martin, N., …Waters, C. (2014). Galactic globular and open cluster fiducial sequences in the Pan-STARRS1 photometric system. Monthly Notices of the Royal Astronomical Society, 442(4), 2999-3009. https://doi.org/10.1093/mnras/stu1081

• Journal Article Type: Article
• Acceptance Date: May 29, 2014
• Publication Date: Aug 21, 2014
• Deposit Date: Jun 16, 2015
• Publicly Available Date: Jun 29, 2015
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 442
• Issue: 4
• Pages: 2999-3009
• DOI: https://doi.org/10.1093/mnras/stu1081
• Keywords: Surveys, Stars: evolution, Hertzsprung–Russell and colour–magnitude diagrams, Globular clusters: general, Open clusters and associations: general.