Probing Halo Substructure With Rr Lryae From Multi-epoch Sdss Data.

Details Probing Halo Substructure With Rr Lryae From Multi-epoch Sdss Data. Probing Halo Substructure With Rr Lryae From Multi-epoch Sdss Data.

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6009f&link_type=abstract

American Astronomical Society, AAS Meeting #211, #60.09; Bulletin of the American Astronomical Society, Vol. 39, p.844

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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