asteroseismology: looking inside stars

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Asteroseismology: Looking inside stars. Rømer. Jørgen Christensen-Dalsgaard & Hans Kjeldsen Aarhus Universitet. Asteroseismology: Looking inside stars. 5. 10. Mission Objective and Critical mission requirements. Rømer Payload: MONS Telescope Design Orbit Platform Design. - PowerPoint PPT Presentation

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  • Asteroseismology: Looking inside starsJrgen Christensen-Dalsgaard & Hans Kjeldsen Aarhus UniversitetRmer

  • Asteroseismology: Looking inside starsHans Kjeldsen Aarhus Universitetrsted: 1999Rmer: 200?

    Danish Small Satellite Programme

  • Asteroseismology: Looking inside starsHans Kjeldsen Aarhus UniversitetDanish Small SatelliteProgramme

    Aarhus UniversitetDansk RumforskningsinstitutTERMA A/S

  • Looking inside stars

  • Asteroseismology:Looking inside stars

  • 5

  • Observing the stars

  • Atmospheric ScintillationObserving the stars

  • Measuring Oscillations in Nearby Stars: MONS

  • Mission Objective and Critical mission requirements

    Rmer (1999-200?)Rmer Payload: MONS Telescope DesignOrbitPlatform Design10

  • Mission Objective and Critical mission requirements

    Rmer primary mission objective

    To provide new insights into the structure and evolution of stars, using them as laboratories tounderstand physics under extreme conditions, by studying oscillations in a sample of 20 solar-typestars.

  • Mission Objective and Critical mission requirements

    Rmer secondary mission objectives

    To study the structure and evolution of stars hotter and more massive than the Sun (delta Scuti and rapidly oscillating Ap stars) by measuring their oscillations.

    To study variability in a large sample of stars of all types.

  • Mission Objective and Critical mission requirements

    Scientific aims (Rmer):

    Properties of convective cores, including overshootStructure and age of low-metallicity starsPhysical properties of stellar matterStellar helium abundancesEffects and evolution of stellar internal rotationDependence of the excitation of oscillationsSurface featuresConvective motions on stellar surfacesReflected lights from exoplanets (and transits)

  • Mission Objective and Critical mission requirements

    Rmer Payload Objectives

    Photometric precision: We must be able to detect oscillations that have very low amplitudes (1-10 ppm)

    Temporal coverage: Each primary target must be observed almost continuously for at least one month, ideally substantially longer

    Sky coverage: The science goals require access to the whole sky over the course of the mission

  • Colour oscillation signalSolar data from VIRGO on SOHO

  • Key mission parameters

  • 32 cm telescopeField MonitorStar Tracker #1Star Tracker #2

  • 15

  • Image on CCD

  • Molniya orbit: Rmer

    Orbit is a 400 x 40,000km 63.4 inclination

    a = 26600 kmi = 63.4 e=0.75 P=11.967 hrs.Change in right ascension of theascending node:

    -0.030 deg/day

    Change in argument of perigee:

    0.000 deg/day

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem20

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude Determinationand Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude DeterminationAnd Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command andData HandlingSubsystem

  • ADCS:Attitude DeterminationAnd Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command andData HandlingSubsystem

  • ADCS:Attitude DeterminationAnd Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command and DataHandling Subsystem

  • ADCS:Attitude DeterminationAnd Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command andData HandlingSubsystem

  • ADCS:Attitude DeterminationAnd Control SubsystemCommunicationStructure andMechanismsPowerThermalCDH:Command andData HandlingSubsystem

  • 2009? Rmer primary mission objective

    To provide new insights into the structure and evolution of stars, using them as laboratories tounderstand physics under extreme conditions, by studying oscillations in a sample of 20 solar-typestars.

  • Ground-based support observationsPreparatory observationsCharacterization of targets (effective temperature, luminosity, composition)Charcterization of target field, including possible interfering objectsParallel observationsFor some objects, simultaneous ground-based velocity observations, for characterization of strongest modes.

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