Gemini Science Archive

Gemini Science Archive Gemini Phoenix System Verification Data

Gemini Phoenix System Verification Data

Data taken as part of instrument System Verification (SV) or for other engineering purposes (including the Demonstration Science programs) and that are deemed to be of scientific value are made public after an assessment period typically not longer than 2 months. You are encouraged to take these datasets and assess or use them yourself.

The available data packages are listed below. The table includes the instrument, data package reference name, (astronomical) target name and a brief summary of the data. A more complete description is contained within the data package itself. Click on the hyperlinks to download the raw data as gzipped tar file(s); these should be saved to disk for unpacking.

The gzipped files may be saved to disk by using "shift+click" or "right-click" plus choose "save" from your browser's menu.

Instrument Data Package Name Target Preview Data package
Phoenix GS-2001B-SV-4 various No preview available GS-2001B-SV-4 Science data (51.5Mb)
GS-2001B-SV-4 Calib. data (67.8Mb)

During commissioning, several objects of scientific interest were observed to test the sensitivity of the instrument. In the process, it was found that the slit wheel was not repositioning correctly (the problem was later traced to loose screws), therefore in some cases the objects were not well centered on the slit. Below is a complete list of the targets, with the corresponding filter/wavelength setup:

Target name Obs. date (UT) OS filter / central wavel. Total exp. time
HD84903 GV metal poor star 2001 Dec 17 J9232 / 1.093µm 1800sec
BD+04 2621 GV metal poor 2001 Dec 17 J9232 / 1.093µm 1800sec
CD-24 1782 metal poor 2001 Dec 18 J9232 / 1.093µm 1800sec
2MASSW J0832-01 K=12.69mag 2001 Dec 18 K4308 / 2.3µm 3600sec
Kelu-1 K=11.8 mag L3 dwarf 2001 Dec 18 K4308 / 2.3µm 1200sec
DENIS-P J0255-4700 L8 dwarf 2001 Dec 19 K4308 / 2.3µm 1800sec
2MASSW J0832-01 K=12.69mag 2001 Dec 19 K4308 / 2.3µm 3600sec
SDSS 0539-00 L5 dwarf 2001 Dec 19 K4308 / 2.3µm 3000sec
Kelu-1 L3 dwarf 2001 Dec 19 K4308 / 2.3µm 1400sec
V3 47 Tuc 2001 Dec 22 M2150 / 3000sec
BS 3165 OI 2001 Dec 22 L2734 / 3.676µm 3060sec
HD73882 2001 Dec 22 L2734 / 3.676µm 2480sec
Phoenix GS-2001B-DS-1 LMC field giant stars No preview available GS-2001B-DS-1 Science data (70.5Mb)
GS-2001B-DS-1 Calib. data (126.7Mb)

Demonstration science spectra of LMC field giant stars at 1.6µm and 2.3µm.

The aims of Demonstration Science were to demonstrate the capabilities of Phoenix on Gemini South and verify the system performance by executing a specific scientific program. The program "Determining the O/Fe ratio in the Large Magellanic Cloud" was selected from 12 responses to a solicitation in June 2001, with the science group involving members from the Gemini partner countries. The members of this group were: V. Smith (US, principal investigator), S. Balachandran (US), B. Barbuy (BR), M. Bessel (AU), R. Blum (CTIO), K. Cunha (BR), D. Geisler (CH), J. Hesser (CA), K. Hinkle (US), D. Lambert (US), J. Melendez (BR), C. Pilachowski (US), B. Rodgers (Gemini) and S. Ryan (UK). C. Winge (Gemini) acted as a global coordinator for this program.

A summary of the science case, results and an example spectrum are available on the Phoenix News page.

The data were obtained in February 2002 and include targets down to K=13mag. The datasets available from this page have not been reduced, but all necessary calibrations are included with the distribution. For any questions regarding the data set, or to get a copy (two data CDs), please contact Claudia Winge (cwinge@gemini.edu).