Introduction

The Large Legacy Treasury Program "The HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation" (GO-13297, PI: G. Piotto, 131 orbits) is a UV-initiative proposal to complement the existing F606W and F814W database of "An ACS Survey of Galactic Globular Cluster" (GO-10775, PI: A. Sarajedini, 134 orbits) by imaging a large sample of clusters through UV/blue WFC3/UVIS filters F275W, F336W and F438W. Because these three filters are sensitive to C, N, and O abundance variations, they allow us to disentangle and characterize multiple populations in globular clusters. Combination of these UV/blue filters with the optical ones also gives the opportunity to measure the helium content of each population.

Our resulting final database contains catalogs and astrometrised stacked images of 56 globular clusters and one open cluster observed during the GO-13297 (PI: Piotto) and the two pilot projects GO-12311 (PI: Piotto) and GO-12605 (PI: Piotto). For each cluster we release 3 catalogs, one for each photometric method adopted. The catalogs contain information on the positions and on the photometry in five bands (F275W, F336W, F438W, F606W, and F814W) of each star found in the cluster field. The catalogs also include membership probability. You can refer to the full collection of HUGS data products using the DOI http://dx.doi.org/10.17909/T9810F.

Description of Data Products

Each cluster is organized into their own subdirectory. Each cluster has multiple files with the following prefix:

where:

• <ins> = instrument name ("acs-wfc", "wfc3-uvis", or "wfc3-uvis-acs-wfc")
• <targ> = target cluster, e.g., "ngc6791"
• <filt> = the filter used, e.g., "f606w", or sometimes "multi" for some file types
• <exteng> = file extension, which correspond to the following:
  
  • stack-????s.fits: stacked image for a given filter reported to the exposure time of the deepest among the images used to obtain the stacked image
  • catalog-meth?.txt: astro-photometric catalog obtained with a give photometric method
  • cmd.png: example of F275W versus F275W-F336W color-magnitude diagram
  • rgb.tif: RGB image of the cluster obtained with F275W, F336W, F438W stacked images

Data Access

The stack FITS images are available for the different exposure times in the filter columns in the table below. The catalog files for each of the three methods and the color-magnitude diagrams and RGB color images are also available in the table (note the RGB images are large and may take a long time to fully display in your browser). Finally, the last column contains a .tar.gz file with all data products for a given cluster, for those who want to download all the files for a given cluster. Note: The same data can also be retrieved at the team's homepage, http://groups.dfa.unipd.it/ESPG/treasury.php

Cluster	RA	Dec.	F275W	F336W	F435W	F438W	F606W	F814W	Catalogs	Plots	Bundle
NGC 0104	6.023792	-72.081306	348s	225s	10s | 100s		3s | 50s	3s | 50s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 0288	13.188500	-26.582611	400s	350s		41s	10s | 130s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 0362	15.809417	-70.848778	519s	350s		54s	10s | 150s	10s | 170s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 1261	48.067542	-55.216222	859s	413s		168s	40s | 350s	40s | 360s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 1851	78.528167	-40.046556	1288s	453s		140s	20s | 350s	20s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 2298	102.247542	-36.005306	981s	350s		136s	20s | 350s	20s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 2808	138.012917	-64.863500	985s	650s		97s	23s | 360s	23s | 370s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 3201	154.403417	-46.412472	754s	310s		68s	5s | 100s	5s | 100s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 4590	189.866583	-26.744056	696s	305s		60s	12s | 130s	12s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 4833	194.891333	-70.876500	936s	350s		136s	10s | 150s	10s | 170s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5024	198.230208	+18.168167	1832s	460s		180s	45s | 340s	45s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5053	199.112875	+17.700250	829s	415s		164s	30s | 340s	30s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5272	205.548417	+28.377278	415s	350s		42s	12s | 130s	12s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5286	206.611708	-51.374250	797s	310s		65s	30s | 350s	30s | 360s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5466	211.363708	+28.534444	930s	350s		135s	30s | 340s	30s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5897	229.351667	-21.010111	926s	350s		140s	25s | 340s	350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5904	229.638417	+2.081028	689s	306s		58s	7s | 140s	7s | 140s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5927	232.002875	-50.673028	668s	310s		66s	30s | 350s	25s | 360s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 5986	236.512500	-37.786417	745s	300s		64s	20s | 350s	20s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6093	244.260042	-22.976083	855s	657s		85s	10s | 340s	10s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6101	246.450500	-72.202194	940s	415s		165s	35s | 370s	35s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6121	245.896750	-26.525750	808s	300s		66s	1s | 25s	1s | 30s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6144	246.807750	-26.023500	748s	304s		61s	25s | 340s	25s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6171	248.132750	-13.053778	926s	350s		140s	12s | 130s	12s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6205	250.421833	+36.459861	427s	350s		46s	7s | 140s	7s | 140s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6218	251.809083	-1.948528	790s	306s		66s	4s | 90s	4s | 90s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6254	254.287708	-4.100306	790s	306s		66s	4s | 90s	4s | 90s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6304	258.634375	-29.462028	693s	304s		61s	20s | 340s	20s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6341	259.280792	+43.135944	707s	304s		59s	7s | 340s	7s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6352	261.371292	-48.422167	706s	311s		72s	7s | 140s	7s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6362	262.979125	-67.048333	720s	323s		68s	10s | 130s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6366	261.934333	-5.079861	795s	305s		62s	10s | 140s	10s | 140s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6388	264.071792	-44.735500	961s	350s		133s	40s | 340s	40s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6397	265.175375	-53.674333	752s	310s		66s	1s | 15s	1s | 15s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6441	267.554417	-37.051444	929s	350s		128s	45s | 340s	45s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6496	269.765333	-44.265944	800s	303s		73s	30s | 340s	30s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6535	270.960458	-0.297639	793s	305s		62s	12s | 130s	12s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6541	272.009833	-43.714889	758s	300s		66s	8s | 140s	8s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6584	274.656667	-52.215778	709s	312s		62s	25s | 350s	25s | 360s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6624	275.918792	-30.361028	800s	295s		81s	15s | 350s	15s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6637	277.846250	-32.348083	923s	350s		130s	18s | 340s	18s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6652	278.940125	-32.990722	800s	312s		86s	18s | 340s	18s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6656	279.099750	-23.904750	812s	475s		141s	3s | 55s	3s | 65s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6681	280.803167	-32.292111	800s	294s		83s	10s | 140s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6715	283.763875	-30.479861	1755s	475s		190s	30s | 340s	7s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6717	283.775167	-22.701472	687s	313s		60s	10s | 130s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6723	284.888125	-36.632250	734s	313s		61s	10s | 140s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6752	287.717125	-59.984556	369s	500s	10s | 380s		2s | 35s	2s | 40s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6779	289.148208	+30.183472	800s	295s		81s	20s | 340s	20s | 350s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6791	290.220833	+37.771667	700s	300s		72s	1s | 50s	1s | 50s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6809	294.998792	-30.964750	822s	294s		66s	4s | 70s	4s | 80s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6838	298.443708	+18.779194	792s	303s		65s	4s | 75s	4s | 80s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6934	308.547375	+7.404472	792s	304s		70s	45s | 340s	45s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 6981	313.365417	-12.537306	710s	305s		70s	10s | 130s	10s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 7078	322.493042	+12.167000	700s	350s		65s	15s | 130s	15s | 150s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 7089	323.362583	-0.823250	785s	313s		62s	20s | 340s	20s | 340s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)
NGC 7099	325.092167	-23.179861	725s	303s		65s	7s | 140s	7s | 140s	meth01 |  meth02 |  meth03	CMD: (png)   | RGB: (png, tif)	(tar.gz)