Accession Number : ADA261440


Title :   Chromospheric Activity in Algol Binaries


Descriptive Note : Annual rept. 1 Oct 1991-30 Sep 1992


Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF ASTRONOMY


Personal Author(s) : Richards, Mercedes T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261440.pdf


Report Date : 10 Aug 1992


Pagination or Media Count : 4


Abstract : A literature search was performed for the probable magnetic properties of 15 Algol-type binaries. The properties examined included detection of Calcium, Hydrogen and Potassium emission, the x-ray luminosity determined from x-ray flares, detection of radio emission and type of polarization, evidence of variations in the brightness of the cool secondary and changes in the orbital periods of the binary which can be linked to changes in the polarity of the magnetic field of the cool star. The technique of Doppler Tomography was used in an attempt to isolate the source of the emission seen in the Hydrogen alpha difference profiles of Algol. The Doppler images indicate that most of the emission is not associated with the cool star but with the mass transfer process and, in particular, with gas found between the two stars.


Descriptors :   *MAGNETIC FIELDS , *BINARY STARS , *CHROMOSPHERE , EMISSION , LUMINOSITY , MAGNETIC PROPERTIES , DETECTION , X RAYS , GASES , BRIGHTNESS , IMAGES , FLARES , STARS , POTASSIUM , POLARITY , DOPPLER SYSTEMS , TOMOGRAPHY , ASTRONOMY , RADIO EQUIPMENT , MASS TRANSFER , ASTROPHYSICS , PROFILES , VARIATIONS , HYDROGEN , SECONDARY , POLARIZATION , ORBITS , CALCIUM


Subject Categories : Astronomy
      Astrophysics
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE