SIMBAD references

2008ApJ...678..865M - Astrophys. J., 678, 865-887 (2008/May-2)

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. and KOEHN B.

Abstract (from CDS):

We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430 deg2 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 (ρOoI∼R–2.26±0.07 and ρOoII∼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.

Abstract Copyright:

Journal keyword(s): Galaxies: Halos - galaxies: individual (Milky Way) - Galaxies: Structure

VizieR on-line data: <Available at CDS (J/ApJ/678/865): table1.dat>

Nomenclature: Table 1: [MRS2008] DDD.dddddd+DD.ddddddd N=838.

Simbad objects: 846

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2021.08.04-11:58:24

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