VizieR Online Data Catalog: Sagittarius II study with the Pristine survey (Longeard+, 2020)
Abstract
Our photometry consists of deep broad-band gMC and observations as well as narrow-band observations with the CaHK filter centred on the metallicity-sensitive Calcium H&K doublet. Sgr II was observed using the wide-field imager MegaCam on the CFHT (Boulade et al. 2003SPIE.4841...72B). The CaHK photometry is part of a larger survey called Pristine (Starkenburg et al. 2017MNRAS.471.2587S). Observations were conducted in service mode by the CFHT staff during the night of 2016 July 2, under good seeing conditions (~0.4arcsec). The integration times are of 3x700s in gMC, 5x500s in iMC, and 3x705s in CaHK. We refer the reader to Laevens et al. (2015ApJ...802L..18L) for the details of the MegaCam data reduction.
Spectroscopic follow-up observations of Sgr II were obtained with Keck and the Deep Extragalactic Imaging Multi-Object Spectrograph (DEIMOS) (Faber et al. 2003SPIE.4841.1657F). The standard set-up was used here with the OG550 filter and the 1200lines/mm grating. The wavelength range goes from 6500 to 9000Å, for a resolution of ~8500. 'Mask 1' was observed on 2015-09-12 and reobserved on 2015-09-18 (97 stars) and 'Mask 2' on 2015-09-08 (110 stars). Mask 2 was designed to be perpendicular to the other two in order to probe potential Sgr II members further away in the South/North direction. To infer the orbit of Sgr II, we first build a sample of possible Sgr II. The proper motions of those stars are retrieved from the Gaia Data Release 2 (Gaia Collaboration 2018A&A...616A...1G, Cat. I/345). All member stars identified as members from our spectroscopy and bright enough to have a proper motion measurement in Gaia are naturally present in this sample. (2 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- February 2023
- Bibcode:
- 2023yCat..74910356L
- Keywords:
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- Galaxies: nearby;
- Abundances: [Fe/H];
- Radial velocities;
- Proper motions;
- Photometry;
- Spectroscopy;
- Optical