Analysis of RR Lyrae Stars in the Northern Sky Variability Survey

Details Analysis of RR Lyrae Stars in the Northern Sky Variability Survey Analysis of RR Lyrae Stars in the Northern Sky Variability Survey

2006-06-05

arxiv.org/abs/astro-ph/0606092v1

Astron.J.132:1202-1220,2006

Astronomy and Astrophysics

Astrophysics

68 pages, 26 figures, 9 tables, accepted to AJ

Scientific paper

10.1086/506198

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 upon the difficulties of clearly classifying RRc (RR1) variables in the NSVS dataset. 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 5 kpc 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 (1995). 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.

Affiliated with

Also associated with

No associations

Rating

Analysis of RR Lyrae Stars in the Northern Sky Variability Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Analysis of RR Lyrae Stars in the Northern Sky Variability Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of RR Lyrae Stars in the Northern Sky Variability Survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-2555