The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis

0555881 - FZÚ 2023 RIV NL eng J - Journal Article
Wolf, M. - Zejda, M. - Mašek, Martin - Kučáková, Hana - Souza de Joode, M. - Uhlař, R. - Zasche, P.
The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis.
New Astronomy. Roč. 92, April (2022), č. článku 101708. ISSN 1384-1076. E-ISSN 1384-1092
R&D Projects: GA MŠMT LTT18004; GA MŠMT(CZ) EF18_046/0016010; GA MŠMT EF16_013/0001402; GA MŠMT(CZ) LM2018105
Grant - others:OP VVV - AUGERII.CZ(XE) CZ.02.1.01/0.0/0.0/18_046/0016010; OP VVV - AUGER-CZ(XE) CZ.02.1.01/0.0/0.0/16_013/0001402
Research Infrastructure: AUGER-CZ II - 90102
Institutional support: RVO:68378271 ; RVO:67985815
Keywords : binaries: close * binaries: eclipsing * stars: fundamental parameters * stars: individual: (V539 Ara, V335 Ser)
OECD category: Astronomy (including astrophysics,space science); Astronomy (including astrophysics,space science) (ASU-R)
Impact factor: 2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.newast.2021.101708

We present new results of our long-term observational project to analyze the variations of the orbital period for early-type eccentric eclipsing binaries. Altogether 77 new mid-eclipse times were measured or derived for two eclipsing binaries, namely V539 Ara and V335 Ser. Based on current O - C diagrams, we found in both systems that times of minima besides the typical apsidal motion show additional cyclical changes likely caused by the third or fourth bodies orbiting the eclipsing pair. The improved periods of apsidal motion are 155 and 1080 years, respectively. For the first time we propose a third and fourth body orbiting V539 Ara, stellar companions in a hierarchical system with a minimal mass of 0.41 and 1.74 Ms. In V355 Ser we found a possible third body with a mass of 0.18 Ms orbiting this eclipsing pair. The third- and fourth-body orbital periods are relatively short: 29 and 57 yr in case of V539 Ara, and 25 yr for V335 Ser.
Permanent Link: http://hdl.handle.net/11104/0330342