Wszystkie pola: Nelson, R. H.

Skocz do pozycji: 1.

Tytuł:: Spectroscopic and photometric study of the contact binary BO CVn
Autorzy:: Szymański, Tomasz
Zoła, Stanisław
Jabłeka, Damian
Kuźmicz, Agnieszka
Winiarski, Maciej
Şenavcı, H. V.
Nelson, R. H.
Opis:: We present the results of the study of the contact binary system BO CVn. We have obtained physical parameters of the components based on combined analysis of new, multi-color light curves and spectroscopic mass ratio. This is the first time the latter has been determined for this object. We derived the contact configuration for the system with a very high filling factor of about 88%. We were able to reproduce the observed light curve, namely the flat bottom of the secondary minimum, only if a third light has been added into the list of free parameters. The resulting third light contribution is significant, about 20-24%, while the absolute parameters of components are: $M_{1}$ = 1.16, $M_{1}$ = 0.39, $R_{1}$ = 1.62 and $R_{1}$ = 1.00 (in solar units). The O-C diagram shows an upward parabola which, under the conservative mass transfer assumption, would correspond to a mass transfer rate of $dM/dt = 6.3 \times 10^{-8}M_{\odot}/yr$, matter being transferred from the less massive component to the more massive one. No cyclic, short-period variations have been found in the O-C diagram (but longer-term variations remain a possibility).
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

Skocz do pozycji: 2.

Tytuł:: Monitoring spots via the TESS data strengthened by the ETV behaviour : an investigation on the contact binary PP Lac
Autorzy:: Bahar, E.
Şenavcı, H. V.
Yılmaz, M.
Zoła, Stanisław
Özavcı, İ.
Selam, S. O.
Gazeas, K.
Nelson, R. H.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

Skocz do pozycji: 3.

Tytuł:: The absolute parameters of the detached eclipsing binary V482 Per
Autorzy:: Yılmaz, M.
Zakrzewski, B.
Şenavcı, H. V.
Zoła, Stanisław
Özavcı, İ.
Gazeas, K.
Nelson, R. H.
Baştürk, Ö.
Liakos, A.
Opis:: We present the results of a spectroscopic, photometric and orbital period variation analysis of the detached eclipsing binary V482 Per. We derived the absolute parameters of the system $(M_{1} = 1.51 M_{\bigodot }, M_{2} = 1.29 M_{\bigodot }, R_{1} = 2.39 R_{\bigodot }, R_{2} = 1.45 R_{\bigodot }, L_{1} = 10.15 L_{\bigodot }, L_{2} = 3.01 L_{\bigodot })$ for the first time in literature, based on an analysis of our own photometric and spectroscopic observations. We confirm the nature of the variations observed in the system’s orbital period, suggested to be periodic by earlier works. A light time effect due to a physically bound, star-sized companion $(M_{3} = 2.14 M_{\bigodot })$ on a highly eccentric (e = 0.83) orbit, seems to be the most likely cause. We argue that the companion can not be a single star but another binary instead. We calculated the evolutionary states of the system’s components, and we found that the primary is slightly evolving after the main sequence, while the less massive secondary lies well inside it.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego