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Title:
Probing Halo Substructure With Rr Lryae From Multi-epoch Sdss Data.
Authors:
Fraser, Oliver J.; Grammer, S. H.; Morgan, D. P.; Welch, A. Z.; Bullock, E. W.; Huehnerhoff, J.; Kalif, M. L.; Maas, R. W.; Muhs, E.; Ule, N. M.; Hilton, E. J.; Meyer, J.; Laws, C.; Sesar, B.; Ivezic, Z.
Affiliation:
AA(Univ. of Washington), AB(Univ. of Washington), AC(Univ. of Washington), AD(Univ. of Washington), AE(Univ. of Washington), AF(Univ. of Washington), AG(Univ. of Washington), AH(Univ. of Washington), AI(Roosevelt H.S.), AJ(Univ. of Washington), AK(Univ. of Washington), AL(Univ. of Washington), AM(Univ. of Washington), AN(Univ. of Washington), AO(Univ. of Washington)
Publication:
American Astronomical Society, AAS Meeting #211, #60.09; Bulletin of the American Astronomical Society, Vol. 39, p.844
Publication Date:
12/2007
Origin:
AAS
Bibliographic Code:
2007AAS...211.6009F

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.
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