Applications of the magneto-optical filter to stellar pulsation measurements

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6034677

Rhodes, JR, E J; Cacciani, A; Tomczyk, S

A proposed method of employing the Cacciani magneto-optical filter (MOF) for stellar seismology studies is described. The method relies on the fact that the separation of the filter bandpasses in the MOF can be changed by varying the level of input power to the filter cells. With the use of a simple servosystem the bandpass of a MOF can be tuned to compensate for the changes in the radial velocity of a star introduced by the orbital motion of the Earth. Such a tuned filter can then be used to record intensity fluctuations through the MOF bandpass over an extended period of time for each given star. Also, the use of a two cell version of the MOF makes it possible to alternately chop between the bandpass located in the stellar line wing and a second bandpass located in the stellar continuum. Rapid interchange between the two channels makes it possible for atmospheric-introduced noise to be removed from the time series.

• Research Organization: University of Southern California, Los Angeles (USA)
• OSTI ID: 6034677
• Report Number(s): N-86-12187
• Country of Publication: United States
• Language: English

Related Subjects

440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERICS
DESIGN
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
FILTERS
MAGNETIC FILTERS
NOISE
OPTICAL FILTERS
RADIAL VELOCITY
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
SEISMOLOGY
STARS
VARIABLE STARS
VELOCITY