Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her

Details Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her

2011-05-25

arxiv.org/abs/1105.5064v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 13 encapsulated Postscript figures. Tables~3, 4, 9 and 12 will be available in electronic form only. Astronomy and A

Scientific paper

We present the results of a multi-site photometric campaign carried out in 2004-2008 for the Algol-type eclipsing binary system CT Her, the primary component of which shows Delta Scuti-type oscillations. Our data consist of differential light curves collected in the filters B and V which have been analysed using the method of Wilson-Devinney (PHOEBE). After identification of an adequate binary model and removal of the best-matching light curve solution, we performed a Fourier analysis of the residual B and V light curves to investigate the pulsational behaviour. We confirm the presence of rapid pulsations with a main period of 27.2 min. Up to eight significant frequencies with semi-amplitudes in the range 3 to 1 mmag were detected, all of which surprisingly lie in the frequency range 43.5-53.5 c\d. This result is independent from the choice of the primary's effective temperature (8200 or 8700 K) since the light curve models for the binary are very similar in both cases. This is yet another case of a complex frequency spectrum observed for an accreting Delta Scuti-type star (after Y Cam). In addition, we demonstrate that the amplitudes of several of these pulsation frequencies show evidence of variability on time scales as short as 1-2 years, perhaps even less. Moreover, our analysis takes into account some recently acquired spectra, from which we obtained the corresponding radial velocities for the years 2007-2009. Investigation of the O-C diagram shows that further monitoring of the epochs of eclipse minima of CT Her will cast a new light on the evolution of its orbital period.

Affiliated with

Also associated with

No associations

Rating

Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her 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 Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-191777