| dc.contributor |
Ribó Gomis, Marc |
|
| dc.creator |
Wulf Sampol, Gerard |
|
| dc.date |
2017-11-15T15:49:35Z |
|
| dc.date |
2017-11-15T15:49:35Z |
|
| dc.date |
2017-06 |
|
| dc.date.accessioned |
2024-12-16T10:25:57Z |
|
| dc.date.available |
2024-12-16T10:25:57Z |
|
| dc.identifier |
http://hdl.handle.net/2445/117813 |
|
| dc.identifier.uri |
http://fima-docencia.ub.edu:8080/xmlui/handle/123456789/20273 |
|
| dc.description |
Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 201, Tutor: Marc Ribó Gomis |
|
| dc.description |
This work consists of the study of the MWC 656 binary system. It was the first binary system composed of a Be star and a black hole ever found. Black holes orbiting Be star are of great interest in the study of supernova explosions and formation of a binary system composed of a neutron star and a black hole because their merging in nearby galaxies could be detected via gravitational waves. We analysed the radial velocities from the photo-spheric He I absorption lines generated in the Be star and from the He II emission line generated in the accretion disc of the compact object. Two single-line fits and one double line fit are presented. From the single-line fits we observed that the epoch and the argument of periastron correspond to those of a binary system. However, we found di_erent eccentricities: e=0.41±0.08 from the Be star orbit and e=0.09±0.03 from the black hole orbit. In addition, from the double-line fit, fixing e to 0.2, we estimated the mass range of the compact object to be M2 =3.0±7.4M which still implies the presence of a black hole. Furthermore, we calculated that a mass loss of ΔM=(3.6±1.9) M_ in a supernova explosion is enough to explain an eccentricity of 0.2±0.1 and the measured space velocity of the binary system. |
|
| dc.format |
5 p. |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.rights |
cc-by-nc-nd (c) Wulf, 2017 |
|
| dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
|
| dc.rights |
info:eu-repo/semantics/openAccess |
|
| dc.source |
Treballs Finals de Grau (TFG) - Física |
|
| dc.subject |
Estels binaris |
|
| dc.subject |
Forats negres (Astronomia) |
|
| dc.subject |
Treballs de fi de grau |
|
| dc.subject |
Double stars |
|
| dc.subject |
Black holes (Astronomy) |
|
| dc.subject |
Bachelor's theses |
|
| dc.title |
New estimate of the black hole mass in the binary system MWC 656 |
|
| dc.type |
info:eu-repo/semantics/bachelorThesis |
|