FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W407769460> ?p ?o ?g. }

• W407769460 abstract "Mechanisms of the disk formation in Be stars may differ from one Be star to another, which may result in the variations in the circumstellar disk’s spectral characters. The mechanism of disk formation is still under debate for the case of binary stars in which a mass transfer could not happened. -Scorpii, the target star in this study, is one of the bright Be binary stars that has been classified as a Be star since 1990s when the star shows a weak Balmer emission line. This thesis mainly presents the spectral characteristics in optical region from the year of 2007 to 2011 in order to study the Be characteristics of this type of star. Over 350 spectra of data have been used for this work. The circumstellar regions of H, H, H, and HeI λ6678 and photospheric region which are represented by HeI λ4388, HeII λ4686, MgII λ4481 and HeI λ4921 have been used in the investigation of the Be disk of -Scorpii. We found that the size of the Be disk of the star particularly, H, was varies with V/R ratio that larger disc size correspond to smaller V/R ratio. The long term V/R variation of -Sco in H line shows that the rotation of the circumstellar disk around the primary is following the one-armed oscillation disk model in a prograde direction. All the circumstellar lines used in this study were found correlated mostly in the same manner: their strength were found decreasing from 2007 to the end of 2010 but increased in 2011 as this star approaches the periastron; the lines were shifted toward the longer wavelength for V>R and vice-versa except during the periastron where the disc is rotating faster. The H and H lines were used in the investigation during the recent periastron and we found that the strength of both lines was largely increased. The high eccentricity of this binary leads the close encounter or periastron that could be significant for the mechanisms of the disk formation. In the second part of this work which studies the evolutionary status of this star, we found that this binary which had the orbital period of 10.817 years wasivunable to perform a mass transfer. Our evolutionary model generated using EV stellar evolution code showed that the star is rotating at ~0.5 of critical velocity, cr, lower than the rotation which was suggested for the Be phenomenon to happen i.e 0.7cr. Even with the slower rotation, the relative intensity of the H emission line still shows about double increment during the 2011 periastron passage compared to the last periastron passage in 2000. It shows that the close encounter of the 8 M companion has a high influence on the appearance and survival of the Be phenomenon of -Sco." @default.
• W407769460 created "2016-06-24" @default.
• W407769460 creator A5067550513 @default.
• W407769460 date "2013-01-01" @default.
• W407769460 modified "2023-09-26" @default.
• W407769460 title "The characteristics of be star in delta scorpii system / Nazhatulshima Ahmad" @default.
• W407769460 hasPublicationYear "2013" @default.
• W407769460 type Work @default.
• W407769460 sameAs 407769460 @default.
• W407769460 citedByCount "0" @default.
• W407769460 crossrefType "dissertation" @default.
• W407769460 hasAuthorship W407769460A5067550513 @default.
• W407769460 hasConcept C121332964 @default.
• W407769460 hasConcept C1276947 @default.
• W407769460 hasConcept C150846664 @default.
• W407769460 hasConcept C173220165 @default.
• W407769460 hasConcept C193786831 @default.
• W407769460 hasConcept C198352243 @default.
• W407769460 hasConcept C2524010 @default.
• W407769460 hasConcept C2779699494 @default.
• W407769460 hasConcept C2780897414 @default.
• W407769460 hasConcept C33923547 @default.
• W407769460 hasConcept C44870925 @default.
• W407769460 hasConcept C4839761 @default.
• W407769460 hasConcept C94130837 @default.
• W407769460 hasConcept C96141758 @default.
• W407769460 hasConceptScore W407769460C121332964 @default.
• W407769460 hasConceptScore W407769460C1276947 @default.
• W407769460 hasConceptScore W407769460C150846664 @default.
• W407769460 hasConceptScore W407769460C173220165 @default.
• W407769460 hasConceptScore W407769460C193786831 @default.
• W407769460 hasConceptScore W407769460C198352243 @default.
• W407769460 hasConceptScore W407769460C2524010 @default.
• W407769460 hasConceptScore W407769460C2779699494 @default.
• W407769460 hasConceptScore W407769460C2780897414 @default.
• W407769460 hasConceptScore W407769460C33923547 @default.
• W407769460 hasConceptScore W407769460C44870925 @default.
• W407769460 hasConceptScore W407769460C4839761 @default.
• W407769460 hasConceptScore W407769460C94130837 @default.
• W407769460 hasConceptScore W407769460C96141758 @default.
• W407769460 hasLocation W4077694601 @default.
• W407769460 hasOpenAccess W407769460 @default.
• W407769460 hasPrimaryLocation W4077694601 @default.
• W407769460 hasRelatedWork W1594085333 @default.
• W407769460 hasRelatedWork W1638568698 @default.
• W407769460 hasRelatedWork W1996419014 @default.
• W407769460 hasRelatedWork W2000446280 @default.
• W407769460 hasRelatedWork W2039310810 @default.
• W407769460 hasRelatedWork W2056245348 @default.
• W407769460 hasRelatedWork W2061168306 @default.
• W407769460 hasRelatedWork W2078751608 @default.
• W407769460 hasRelatedWork W2090384175 @default.
• W407769460 hasRelatedWork W2133260979 @default.
• W407769460 hasRelatedWork W2133802452 @default.
• W407769460 hasRelatedWork W2143922101 @default.
• W407769460 hasRelatedWork W2152804357 @default.
• W407769460 hasRelatedWork W2169400387 @default.
• W407769460 hasRelatedWork W2314057445 @default.
• W407769460 hasRelatedWork W2950071817 @default.
• W407769460 hasRelatedWork W3049299496 @default.
• W407769460 hasRelatedWork W3099579846 @default.
• W407769460 hasRelatedWork W3105829967 @default.
• W407769460 hasRelatedWork W3107855689 @default.
• W407769460 isParatext "false" @default.
• W407769460 isRetracted "false" @default.
• W407769460 magId "407769460" @default.
• W407769460 workType "dissertation" @default.