136 citations · 1.1k across the 42 of their papers we have counts for
14 papers · 1 filter
Luminosity-Colours relations for thin disc main-sequence stars
S. Bilir, S. Karaali, S. Ak +3
In this study we present the absolute magnitude calibrations of thin disc main-sequence stars in the optical (), and in the near-infrared (). Thin disc stars are iden…
Estimation of galactic model parameters in high latitudes with SDSS
S. Bilir, A. Cabrera-Lavers, S. Karaali +3
We estimated the Galactic model parameters for a set of 36 high-latitude fields included in the currently available Data Release 5 (DR 5) of the Sloan Digital Sky Survey ({\em SDSS…
Transformations between 2MASS, SDSS and BVRI photometric systems: bridging the near infrared and optical
S. Bilir, S. Ak, S. Karaali +3
We present colour transformations for the conversion of the {\em 2MASS} photometric system to the Johnson-Cousins system and further into the {\em SDSS} system. We…
Spatial distribution and galactic model parameters of cataclysmic variables
T. Ak, S. Bilir, S. Ak +1
The spatial distribution, galactic model parameters and luminosity function of cataclysmic variables (CVs) in the solar neighbourhood have been determined from a carefully establis…
The metallicity distributions in high-latitudes with SDSS
S. Ak, S. Bilir, S. Karaali +2
We present metallicities and their variations with different parameters for 36 high-latitude fields covering Galactic longitudes 0<l<360. The metallicities for relatively short ver…
A new absolute magnitude calibration with 2MASS for cataclysmic variables
T. Ak, S. Bilir, S. Ak +1
Using reliable trigonometric measurements, we find that the absolute magnitude of cataclysmic variables depends on the orbital period and de-reddened and $(H-K_{s})_{0}…
Estimation of Galactic model parameters with the SDSS and metallicity distribution in two fields in the anti-centre direction of the Galaxy
S. Ak, S. Bilir, S. Karaali +1
We estimated the Galactic model parameters from the SDSS data reduced for two fields in the anti-centre direction of the Galaxy, , and symmetric relative to the Galacti…
Estimation of Galactic model parameters in high latitudes with 2MASS
A. Cabrera-Lavers, S. Bilir, S. Ak +2
In this paper, we try to find any dependence of the Galactic structural parameters with the Galactic longitude for either the thin disc or the thick disc of the Milky Way, that wou…
Galactic longitude dependent Galactic model parameters
S. Bilir, S. Karaali, S. Ak +2
We present the Galactic model parameters for thin disc estimated by Sloan Digital Sky Survey (SDSS) data of 14 940 stars with apparent magnitudes in six intermedia…
Galactic model parameters for field giants separated from field dwarfs by their 2MASS and V apparent magnitudes
S. Bilir, S. Karaali, T. Guver +2
We present a procedure which separates field dwarfs and field giants by their 2MASS and V apparent magnitudes. The procedure is based on the spectroscopically selected standards, h…
Analysis of UBV Photometry in Selected Area 133
Y. Karatas, S. Bilir, S. Karaali +1
We interpret the de-reddened UBV data for the field SA 133 to deduce the stellar density and metallicity distributions function. The logarithmic local space density for giants, $D^…
A New Procedure for the Photometric Parallax Estimation
S. Karaali, Y. Karatas, S. Bilir +2
We present a new procedure for photometric parallax estimation. The data for 1236 stars provide calibrations between the absolute magnitude offset from the Hyades main-sequence and…
A CCD Study of High Latitude Galactic Structure: Testing the Model Parameters
S. Karaali, S. G. Ak, S. Bilir +2
We interpret published CCD UBVI data to deduce the stellar density distribution and metallicity distribution function in the region from 2-8 kpc from the Galactic Plane, and compar…
New metallicity calibration down to [Fe/H] = -2.75 dex
S. Karaali, S. Bilir, Y. Karatas +1
88 dwarfs, covering the colour index interval 0.37 <(B-V)o <= 1.07 mag, with metallicities -2.70 <= [Fe/H] <= +0.26 dex have been taken from three different sources for new metalli…