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J/ApJ/678/865 LONEOS-I RR Lyrae stars (Miceli+, 2008)
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Beginning of ReadMe :J/ApJ/678/865 LONEOS-I RR Lyrae stars (Miceli+, 2008)
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Evidence for distinct components of the galactic stellar halo from 838 RR Lyrae
stars discovered in the LONEOS-I survey.
Miceli A., Rest A., Stubbs C.W., Hawley S.L., Cook K.H., Magnier E.A.,
Krisciunas K., Bowell E., Koehn B.
<Astrophys. J., 678, 865-887 (2008)>
=2008ApJ...678..865M
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ADC_Keywords: Stars, halo ; Stars, variable ; Photometry
Keywords: galaxies: halos - galaxies: individual (Milky Way) -
galaxies: structure
Abstract:
We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near
Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430deg^2^
and span distances ranging from 3 to 30kpc from the Galactic center.
Object selection is based on phased, photometric data with 28-50 epochs.
We use this large sample to explore the bulk properties of the stellar
halo, including the spatial distribution. The period-amplitude
distribution of this sample shows that the majority of these RR Lyrae
stars resemble Oosterhoff type I, but there is a significant fraction
(26%) which have longer periods and appear to be Oosterhoff type II.
We find that the radial distributions of these two populations have
significantly different profiles (rho_OoI_ R^-2.26+/-0.07^ and
rho_OoII_ R^-2.88+/-0.11^). This suggests that the stellar halo was
formed by at least two distinct accretion processes and supports
dual-halo models.
Description:
The LONEOS-I photometric variability database discussed in this paper
consists of photometric data obtained between 1998 and 2000. Situated
on the Anderson Mesa outside Flagstaff, Arizona, LONEOS is carried out
with a 0.6m Schmidt telescope. It covers a large fraction of the sky,
much of it imaged in multiple epochs (see Fig. 1).