New analysis of the light time effect in TU Ursae Majoris
Abstract
Context. Recent statistical studies prove that the percentage of RR Lyrae pulsators that are located in binaries or multiple stellar systems is considerably lower than might be expected. This can be better understood from an in-depth analysis of individual candidates. We investigate in detail the light time effect of the most probable binary candidate
Aims: We model possible light time effect of
Methods: We used new approach to determine brightness maxima timings based on template fitting. This can also be used on sparse or scattered data. This approach was successfully applied on measurements from different sources. To determine the orbital parameters of the double star
Results: Maxima timings adopted from the GEOS database (168) together with those newly determined from sky surveys and new measurements (85) were used to construct an O-C diagram spanning almost five proposed orbital cycles. This data set is three times larger than data sets used by previous authors. Modelling of the O-C dependence resulted in 23.3-yr orbital period, which translates into a minimum mass of the second component of about 0.33 M⊙. Secular changes in the pulsation period of
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2016
- DOI:
- 10.1051/0004-6361/201525870
- arXiv:
- arXiv:1502.03331
- Bibcode:
- 2016A&A...589A..94L
- Keywords:
-
- binaries: general;
- techniques: photometric;
- techniques: radial velocities;
- stars: variables: RR Lyrae;
- methods: data analysis;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 14 pages, 11 figures, Accepted for publication in Astronomy &