SIMBAD references

2007AJ....133.1658S - Astron. J., 133, 1658-1672 (2007/April-0)

The ACS survey of Galactic globular clusters. I. Overview and clusters without previous Hubble Space Telescope photometry.

SARAJEDINI A., BEDIN L.R., CHABOYER B., DOTTER A., SIEGEL M., ANDERSON J., APARICIO A., KING I., MAJEWSKI S., MARIN-FRANCH A., PIOTTO G., REID I.N. and ROSENBERG A.

Abstract (from CDS):

We present the first results of a large Advanced Camera for Surveys (ACS) survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N (signal-to-noise ratio) ≳10 for main-sequence stars with masses ≳0.2 M in a sample of globulars using the ACS Wide Field Channel. Here we focus on clusters without previous HST imaging data. These include NGC 5466, NGC 6779, NGC 5053, NGC 6144, Palomar 2, E3, Lyngå 7, Palomar 1, and NGC 6366. Our color-magnitude diagrams (CMDs) extend reliably from the horizontal branch to as much as 7 mag fainter than the main-sequence turnoff and represent the deepest CMDs published to date for these clusters. Using fiducial sequences for three standard clusters (M92, NGC 6752, and 47 Tuc) with well-known metallicities and distances, we perform main-sequence fitting on the target clusters in order to obtain estimates of their distances and reddenings. These comparisons, along with fitting the cluster main sequences to theoretical isochrones, yield ages for the target clusters. We find that the majority of the clusters have ages that are consistent with the standard clusters at their metallicities. The exceptions are E3, which appears ∼2 Gyr younger than 47 Tuc, and Pal 1, which could be as much as 8 Gyr younger than 47 Tuc.

Abstract Copyright:

Journal keyword(s): Galaxy: Globular Clusters: Individual: Alphanumeric: E3 - Galaxy: Globular Clusters: Individual: Name: Lyngå 7 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 5053 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 5466 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6144 - globular clusters: individual (NGC 6366) - globular clusters: individual (NGC 6779) - Galaxy: Globular Clusters: Individual: Name: Palomar 1 - globular clusters: individual (Palomar 2) - Stars: Hertzsprung-Russell Diagram

VizieR on-line data: <Available at CDS (J/AJ/133/1658): clusters.dat acssggc.dat>

Nomenclature: [SBC2007] NGC NNNN NNNNNN, [SBC2007] Arp2 NNNNN, [SBC2007] E3 NNNN, [SBC2007] Lynga7 NNNNN, [SBC2007] PalNN NNNNN, [SBC2007] TerzanN NNNNN, N∼6 million.

Simbad objects: 73

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