Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734216y&link_type=abstract
American Astronomical Society, AAS Meeting #217, #342.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of an extensive survey of RR Lyrae stars in three fields along the major axis of the Triangulum Galaxy (M33). From images taken with the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on-board the Hubble Space Telescope (HST) through two passbands (F606W and F814W), we have identified and characterized a total of 119 RR Lyrae variables (96 RRab (RR0) and 23 RRc(RR1)) in M33. Using the properties of 83 RR Lyrae stars (65 RRab and 18 RRc) in the innermost ACS field (hereafter DISK2), we find mean periods of = 0.553 ± 0.008 (error1) ± 0.05 (error2) and = 0.325 ± 0.008 (error1) ± 0.05 (error2), where the `error1' value represents the standard error of the mean and the `error2' value is based on the error of an individual RRL period calculated from our synthetic light curve simulations. The distribution of RRab periods and the frequency of RRc stars (Nc=n(c)/n(abc)=0.22) strongly suggest that these RR Lyraes follow the general characteristics of those in Oosterhoff type I Galactic globular clusters. The Oosterhoff I properties of the M33 field RR Lyrae stars agree well with those of RR Lyrae populations found in the M31 halo consistent with the past interaction history of these two galaxies.
Garnett Don R.
Holtzman Jon A.
Sarajedini Ata
Yang Soung-Chul
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