Evidence for Distinct Components of the Galactic Stellar Halo from 838 RR Lyrae Stars Discovered in the LONEOS-I Survey
We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430 deg super(2) and span distances ranging from 3 to 30 kpc from the Galactic center. Object selection is based on phased, photometric data with 28-50 epochs. We use...
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| Veröffentlicht in: | The Astrophysical journal 2008-05, Vol.678 (2), p.865-887 |
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| container_title | The Astrophysical journal |
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| creator | Miceli, Antonino Rest, Armin Stubbs, Christopher W Hawley, Suzanne L Cook, Kem H Magnier, Eugene A Krisciunas, Kevin Bowell, Edward Koehn, Bruce |
| description | We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430 deg super(2) and span distances ranging from 3 to 30 kpc 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 ([image] and [image]). This suggests that the stellar halo was formed by at least two distinct accretion processes and supports dual-halo models. |
| doi_str_mv | 10.1086/533484 |
| format | Article |
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| title | Evidence for Distinct Components of the Galactic Stellar Halo from 838 RR Lyrae Stars Discovered in the LONEOS-I Survey |
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