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Doctoral thesis
Open access
English

Classical Cepheids: High-precision Velocimetry, Cluster Membership, and the Effect of Rotation

Defense date2013-12-16
Abstract

Classical Cepheids are crucial calibrators of the extragalactic distance scale. Despite the adjective 'classical' and their use as 'standard candles', many open problems remain and ensure a steady scientific interest in these objects. This thesis has contributed to the understanding of Cepheids via three different topics: (1) an unprecedented observational program dedicated to studying highly precise Doppler measurements (velocimetry), which as has enabled several observational discoveries; (2) a newly-developed astro-statistical method for conducting an all-sky census of Cepheids belonging to Galactic open clusters, which is suitable for the era of large surveys (big data) such as the ESA's Gaia space mission; (3) the first detailed investigation of the effect of rotation on populations of classical Cepheids using Geneva stellar evolution models, which provides an explanation for the 45-year old Cepheid mass discrepancy problem. Last, but not least, I investigated the implications of my work for the extragalactic distance scale.

eng
Keywords
  • Astronomy
  • Astrophysics
  • Stellar physics
  • Observational astronomy
  • Theoretical astrophyscis
  • Classical Cepheids
  • Distance scale
  • Gaia
  • Stellar evolution
  • Radial velocity
Funding
  • Autre - GAIA
Citation (ISO format)
ANDERSON, Richard Irving. Classical Cepheids: High-precision Velocimetry, Cluster Membership, and the Effect of Rotation. 2013. doi: 10.13097/archive-ouverte/unige:35356
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