J/AJ/132/1202 RR Lyrae in Northern Sky Variability Survey (Kinemuchi+, 2006)
Analysis of RR Lyrae stars in the Northern Sky Variability Survey.
Kinemuchi K., Smith H.A., Wozniak P.R., McKay T.A.
<Astron. J., 132, 1202-1220 (2006)>
=2006AJ....132.1202K 2006AJ....132.1202K
ADC_Keywords: Surveys ; Stars, variable ; Photometry ; Abundances, [Fe/H]
Keywords: Galaxy: disk - stars: variables: other
Abstract:
We use data from the Northern Sky Variability Survey (NSVS), obtained
from the first-generation Robotic Optical Transient Search Experiment
(ROTSE-I), to identify and study RR Lyrae variable stars in the solar
neighborhood. We initially identified 1197 RRab (RR0) candidate stars
brighter than the ROTSE median magnitude V=14. Periods, amplitudes,
and mean V magnitudes are determined for a subset of 1188 RRab stars
with well-defined light curves. Metallicities are determined for 589
stars by the Fourier parameter method and by the relationship between
period, amplitude, and [Fe/H]. We comment on the difficulties of
clearly classifying RRc (RR1) variables in the NSVS data set.
Distances to the RRab stars are calculated using an adopted
luminosity-metallicity relation with corrections for interstellar
extinction. The 589 RRab stars in our final sample are used to study
the properties of the RRab population within 5kpc of the Sun. The
Bailey diagram of period versus amplitude shows that the largest
component of this sample belongs to Oosterhoff type I. Metal-rich
([Fe/H]>-1) RRab stars appear to be associated with the Galactic
disk. Our metal-rich RRab sample may include a thin-disk, as well as a
thick-disk population, although the uncertainties are too large to
establish this. There is some evidence among the metal-rich RRab stars
for a decline in scale height with increasing [Fe/H], as was found by
Layden. The distribution of RRab stars with -1<[Fe/H]←1.25
indicates that within this metallicity range the RRab stars are a
mixture of stars belonging to halo and disk populations.
Description:
The NSVS database (See http://skydot.lanl.gov/) is constructed from
observations taken from ROTSE-I. The NSVS is based on a year's worth
of observations, beginning in 1999 April and ending in 2000 March. The
data used for this work were obtained from a version of the NSVS
database at the University of Michigan.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 41 589 Photometric Metallicity of NSVS RRab Stars
table4.dat 49 1188 NSVS RRab Properties
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See also:
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
J/AJ/128/2965 : Red variables in the NSVS (Williams+, 2004)
J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
http://skydot.lanl.gov : NSVS database
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- NSVS Northern Sky Variability Survey ID number
10- 14 F5.2 [-] [Fe/H]AP The Sandage (2004AJ....128..858S 2004AJ....128..858S) [Fe/H] value
16- 19 F4.2 [-] e_[Fe/H]AP The 1σ uncertainty in [Fe/H]AP
21- 25 F5.2 [-] [Fe/H]JK ? The Jurcsik & Kovacs (1996, Cat.
J/A+A/312/111) [Fe/H] value
27- 30 F4.2 [-] e_[Fe/H]JK ? The 1σ uncertainty in [Fe/H]JK
32- 36 F5.2 [-] [Fe/H] The best estimate of [Fe/H]
38- 41 F4.2 [-] e_[Fe/H] The 1σ uncertainty in [Fe/H]
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- NSVS Northern Sky Variability Survey ID number
10- 19 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
21- 30 F10.6 deg DEdeg Declination in decimal degrees (J2000)
32- 38 F7.5 d Per Period
40- 43 F4.2 mag Vamp ROTSE amplitude, scaled to Johnson V band
45- 49 F5.2 mag Vmag Mean intensity-weighted V band magnitude
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History:
From electronic version of the journal
References:
Wozniak et al., 2004AJ....127.2436W 2004AJ....127.2436W, NSVS,
ftp://skydot.lanl.gov/pub/projects/skydot/nsvs/red_variables/
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Apr-2008