A new analysis of the radial velocity variations of the eclipsing and spectroscopic binary EN Lacertae
Abstract
An analysis of 1236 new electronic spectra of the eclipsing binary EN Lac from four observatories and of 994 radial velocities (RV hereafter) from photographic spectra, published by several authors, has allowed us to disentangle the RV variations due to orbital motion and due to pulsations of the star. New, accurate orbital elements as well as precise values of the three pulsation periods, already known from the previous studies, were derived. The accuracy of the orbital solution has been substantially improved after the observed RV changes were properly prewhitened for the short-term oscillations. The amplitude of the dominant RV oscillation with a period of P_1=0fd16916703 was found to vary with a 74 year cycle. The amplitudes of the two other RV oscillations, having periods of P_3=0fd 18173256 and P_2=0fd 17085554, vary on much shorter time scales of 674 d and 331 d, respectively. The value of P_2 derived here does not correspond to a one year alias of the value found by several authors from photometry but appears to be an intrinsic period. The time scales of the amplitude modulations found for P_1 and P_3 are in good agreement with previous photometric results. For the first time we present evidence of line profile variations of
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2001
- DOI:
- 10.1051/0004-6361:20000344
- Bibcode:
- 2001A&A...367..236L
- Keywords:
-
- STARS: BINARIES: CLOSE;
- STARS: BINARIES: ECLIPSING;
- STARS: BINARIES: SPECTROSCOPIC;
- STARS: FUNDAMENTAL PARAMETERS;
- STARS: OSCILLATIONS;
- STARS: INDIVIDUAL: EN LAC