A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves

Details A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves

2008-11-19

arxiv.org/abs/0811.3098v1

Astronomy and Astrophysics

Astrophysics

12 pages, 10 figures, 4 tables. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.14262.x

We present a new method for determining physical parameters of RRab variables exclusively from multicolour light curves. Our method is an Inverse Photometric Baade-Wesselink analysis which, using a nonlinear least squares algorithm, searches for the effective temperature (T_eff) and pulsational velocity (V_p) curves and other physical parameters that best fit the observed light curves, utilising synthetic colours and bolometric corrections from static atmosphere models. The T_eff and V_p curves are initially derived from empirical relations then they are varied by the fitting algorithm. The method yields the variations and the absolute values of the radius, the effective temperature, the visual brightness, and the luminosity of individual objects. Distance and mass are also determined. The method is tested on 9 RRab stars subjected to Baade-Wesselink analyses earlier by several authors. The physical parameters derived by our method using only the light curve data of these stars are well within their possible ranges defined by direct Baade-Wesselink and other techniques. A new empirical relation between the I_C magnitude and the pulsational velocity is also presented, which allows to construct the V_p curve of an RRab star purely from photometric observations to an accuracy of about 3.5 km/s.

Affiliated with

Also associated with

No associations

Rating

A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves 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 A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new method for determining physical parameters of fundamental mode RR Lyrae stars from multicolour light curves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-429142