Resumo

KIRAN, E.; BAKIş, V.; BAKIş, H.  e  DEğGIRMENCI, Ö. L.. The first detailed analysis on the astrophysical properties of the eccentric binary V990 Her. Rev. mex. astron. astrofis [online]. 2021, vol.57, n.2, pp.363-379.  Epub 15-Fev-2022. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2021.57.02.09.

We present accurate physical parameters of the eccentric binary system V990 Her which has an orbital period of P = 8.193315±0.000003 days using its photometric and spectroscopic data. The physical parameters of the components were derived as $T_{\mathrm{e}\mathrm{f}\mathrm{f}1}$= $8000\pm 200$K, $T_{\mathrm{e}\mathrm{f}\mathrm{f}2}$= $7570\pm 200$K, $M_1$ = $2.01\pm 0.07$ $M_{\odot }$, $M_2$ = $1.83\pm 0.03$ $M_{\odot }$, $R_1$ = $2.22\pm 0.02$ $R_{\odot }$, $R_2$ = $2.12\pm 0.01$ $R_{\odot }$, $\mathrm{l}\mathrm{o}\mathrm{g}(L_1/L_{\odot })=1.25\pm 0.04$, $\mathrm{l}\mathrm{o}\mathrm{g}(L_2/L_{\odot })=1.12\pm 0.05$. Our findings revealed that both components are slightly evolved from the zero-age main sequence with an age of $6.3\times {10}^8$ years. We estimated an apsidal motion with a period of $U=14683\pm 2936$ years in the system and the internal structure constants of the components were derived for the first time.