FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W75643663> ?p ?o ?g. }

• W75643663 abstract "This thesis presents a detailed investigation of the rotational behaviour of young pre-main sequence (PMS) stars in order to achieve a better understanding of their angular momentum evolution during this evolutionary stage. For that purpose I have carried out an extensive photometric monitoring program which enabled me to identify a total of 405 periodic and 184 irregular variable PMS stars in the young open cluster NGC 2264 (age: 2-4 Myr). Hence, I could increase the number of known PMS stars in NGC 2264 by more than a factor of three and the number of published periods by more than a factor of ten. Apart from the Orion Nebular Cluster (ONC, age: 1 Myr), with about 370 known rotation periods, NGC 2264 is therefore the only cluster for which a statistically significant number of rotation periods of PMS stars is known. For the first time it was possible to compare the rotational behaviour of stars of two young clusters with each other. I have shown that the period distribution of stars in NGC 2264 strongly depends on mass and quantitatively agrees with that of the ONC. However, the stars in NGC 2264 rotate with shorter rotation periods on average. A quantitative analysis which took into account the age ratio and the different stellar radii showed that a large fraction of stars spin up with conserved angular momentum while increasing in age. However, I also found that some stars clearly rotate with longer rotation periods even though they are aging. Apparently, these stars lose angular momentum, which is interpreted as a result of magnetic coupling to their circumstellar disk (``disk-locking''). The resulting locking period is about 8 days. My analysis further showed that ``disk-locking'' in NGC,2264 or the ONC is important only for higher mass stars (M >= 0.3$msun$). There is evidence that also the lower mass stars (M <= 0.3$msun$) interact magnetically with their disks, but this interaction is in most cases not strong enough to remove angular momentum with sufficiently high rates to lock the star with a constant rotation period. These findings are closely connected with a surprising result. The typical brightness variations of the stars in NGC 2264 (caused by star spots) differ for the two mass regimes considered here. While the peak-to-peak variation of the higher mass stars is typically up to 0.2 mag, the lower mass stars show brightness modulations only up to 0.06 mag. I argue that this is evidence for a different magnetic field structure, caused by different dynamo processes, and could be the decisive factor for the different rotational behaviour of the lower mass stars." @default.
• W75643663 created "2016-06-24" @default.
• W75643663 creator A5008138109 @default.
• W75643663 date "2003-11-01" @default.
• W75643663 modified "2023-09-27" @default.
• W75643663 title "Angular momentum evolution of young stars" @default.
• W75643663 doi "https://doi.org/10.11588/heidok.00004105" @default.
• W75643663 hasPublicationYear "2003" @default.
• W75643663 type Work @default.
• W75643663 sameAs 75643663 @default.
• W75643663 citedByCount "0" @default.
• W75643663 crossrefType "dissertation" @default.
• W75643663 hasAuthorship W75643663A5008138109 @default.
• W75643663 hasConcept C121332964 @default.
• W75643663 hasConcept C1276947 @default.
• W75643663 hasConcept C150846664 @default.
• W75643663 hasConcept C155675718 @default.
• W75643663 hasConcept C164866538 @default.
• W75643663 hasConcept C199360897 @default.
• W75643663 hasConcept C2524010 @default.
• W75643663 hasConcept C33923547 @default.
• W75643663 hasConcept C41008148 @default.
• W75643663 hasConcept C44870925 @default.
• W75643663 hasConcept C48393594 @default.
• W75643663 hasConcept C52348108 @default.
• W75643663 hasConcept C74050887 @default.
• W75643663 hasConcept C74650414 @default.
• W75643663 hasConcept C88991977 @default.
• W75643663 hasConcept C9411552 @default.
• W75643663 hasConceptScore W75643663C121332964 @default.
• W75643663 hasConceptScore W75643663C1276947 @default.
• W75643663 hasConceptScore W75643663C150846664 @default.
• W75643663 hasConceptScore W75643663C155675718 @default.
• W75643663 hasConceptScore W75643663C164866538 @default.
• W75643663 hasConceptScore W75643663C199360897 @default.
• W75643663 hasConceptScore W75643663C2524010 @default.
• W75643663 hasConceptScore W75643663C33923547 @default.
• W75643663 hasConceptScore W75643663C41008148 @default.
• W75643663 hasConceptScore W75643663C44870925 @default.
• W75643663 hasConceptScore W75643663C48393594 @default.
• W75643663 hasConceptScore W75643663C52348108 @default.
• W75643663 hasConceptScore W75643663C74050887 @default.
• W75643663 hasConceptScore W75643663C74650414 @default.
• W75643663 hasConceptScore W75643663C88991977 @default.
• W75643663 hasConceptScore W75643663C9411552 @default.
• W75643663 hasLocation W756436631 @default.
• W75643663 hasOpenAccess W75643663 @default.
• W75643663 hasPrimaryLocation W756436631 @default.
• W75643663 hasRelatedWork W1513696212 @default.
• W75643663 hasRelatedWork W171439241 @default.
• W75643663 hasRelatedWork W1987774425 @default.
• W75643663 hasRelatedWork W1996357848 @default.
• W75643663 hasRelatedWork W2003690913 @default.
• W75643663 hasRelatedWork W2025977350 @default.
• W75643663 hasRelatedWork W2066660495 @default.
• W75643663 hasRelatedWork W2068240743 @default.
• W75643663 hasRelatedWork W2087939793 @default.
• W75643663 hasRelatedWork W2102665302 @default.
• W75643663 hasRelatedWork W2112675814 @default.
• W75643663 hasRelatedWork W2166394283 @default.
• W75643663 hasRelatedWork W2561020820 @default.
• W75643663 hasRelatedWork W3098957108 @default.
• W75643663 hasRelatedWork W3101104747 @default.
• W75643663 hasRelatedWork W3102559346 @default.
• W75643663 hasRelatedWork W3103261679 @default.
• W75643663 hasRelatedWork W3135840872 @default.
• W75643663 hasRelatedWork W3165153752 @default.
• W75643663 hasRelatedWork W2135930424 @default.
• W75643663 isParatext "false" @default.
• W75643663 isRetracted "false" @default.
• W75643663 magId "75643663" @default.
• W75643663 workType "dissertation" @default.