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| 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 |
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