dc.contributor.author |
Cherepashchuk A.M. |
|
dc.contributor.author |
Belinski A.A. |
|
dc.contributor.author |
Dodin A.V. |
|
dc.contributor.author |
Postnov K.A. |
|
dc.date.accessioned |
2022-02-09T20:40:44Z |
|
dc.date.available |
2022-02-09T20:40:44Z |
|
dc.date.issued |
2021 |
|
dc.identifier.issn |
1745-3925 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/169626 |
|
dc.description.abstract |
The examination of long-term (1979-2020) photometric observations of SS433 enabled us to discover a non-zero orbital eccentricity of e = 0.05 ± 0.01. We have also found evidence for a secular increase in the orbital period at a rate of ˙Pb=(1.0± 0.3)× 10-7 s s-1. The binary orbital period increase rate makes it possible to improve the estimate of the binary mass ratio q = MX/MV > 0.8, where MX and MV are the masses of the relativistic object and the optical star, respectively. For an optical star mass of 10 M⊙, the mass of the relativistic object (a black hole) is MX > 8 M⊙. A neutron star in SS433 is reliably excluded because in that case the orbital period should decrease, in contradiction to observations. The derived value of ˙Pb sets a lower limit on the mass-loss rate in the Jeans mode from the binary system 7 × 10-6 M⊙ yr-1. The discovered orbital ellipticity of SS433 is consistent with the model of the slaved accretion disc tracing the precession of the misaligned optical star's rotational axis. |
|
dc.relation.ispartofseries |
Monthly Notices of the Royal Astronomical Society: Letters |
|
dc.subject |
binaries: close |
|
dc.subject |
stars: black holes |
|
dc.subject |
stars: individual: SS433 |
|
dc.title |
Discovery of orbital eccentricity and evidence for orbital period increase of SS433 |
|
dc.type |
Article |
|
dc.relation.ispartofseries-issue |
1 |
|
dc.relation.ispartofseries-volume |
507 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.relation.startpage |
L19 |
|
dc.source.id |
SCOPUS17453925-2021-507-1-SID85114596366 |
|