Probing Halo Substructure With Rr Lryae From Multi-epoch Sdss Data.
Abstract
We used RR Lyrae candidates from Sesar et. al. (2007) to investigate probable over-densities in the Galactic Halo. Candidate RR Lyrae were selected using multi-epoch SDSS-I observations as stars that vary more than 0.05 mag (rms) in the SDSS r and g bands, and that have RR Lyrea colors as described in Ivezic et. al. (2005). The candidates found using this technique reveal several previously unknown clumps or over-densities of RR Lryae in the Galactic Halo. The follow-up photometry obtained at Manastash Ridge Observatory of 40 stars in three of these over-densities typically includes 20-30 points per light curve. We find that two-thirds of our sample of 40 stars has light curves consistent with RR Lyrae, and that the over-densities likely indicate substructure in the Galactic Halo.
- Publication:
-
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2007
- Bibcode:
- 2007AAS...211.6009F