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J/ApJ/678/865            LONEOS-I RR Lyrae stars                 (Miceli+, 2008)

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
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 1430deg2 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 (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. 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). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 42 838 Properties of 838 LONEOS-I RR Lyrae sample
See also: J/AJ/132/714 : QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006) J/AJ/132/1202 : RR Lyrae in Northern Sky Variability Survey (Kinemuchi+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 12- 21 F10.6 deg DEdeg Declination in decimal degrees (J2000) 23- 27 F5.2 mag <Vmag> Mean LONEOS V band magnitude (1) 29- 36 F8.6 d Per Period 38- 42 F5.3 mag Amp Amplitude (2)
Note (1): Tied to the VSDSS system (VSDSS = r + 0.44(g-r) - 0.02) Note (2): Measured from minimum to maximum brightness as defined by the RR Lyrae template that best fit the lightcurve.
Nomenclature note: objects are designed by <[MRS2008] DDD.dddddd+DD.ddddddd> in Simbad. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Sep-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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