Fiber-optic echelle CCD observations of SS Bootis

Jeffrey C. Hall, David P. Huenemoerder, Lawrence W. Ramsey, Derek L. Buzasi

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8 Scopus citations

Abstract

We have observed the faint RS CVn system SS Bootis over two seasons and have examined the most prominent surface activity indicators in this spectroscopically understudied object. The first two Balmer lines are consistently strongly in emission, as are the Ca II infrared triplet and Ca II H line; there is no significant modulation with phase in any of these lines. No excess emission is evident in He I D3. The ratio of energy emitted in Hα to that in Hβ is typically between three and six for the more active subgiant primary, and between two and five for the dwarf secondary. Of special interest is an excess absorption feature in the Balmer lines near primary eclipse in both seasons. The feature lies near the velocity of the secondary, and as there is no similar feature in secondary eclipse, we suggest that it arises from obscuring material associated with the primary. From the extent of the feature and the system's geometry we have placed limits on the parameters of such material.

Original languageEnglish (US)
Pages (from-to)610-616
Number of pages7
JournalAstrophysical Journal
Volume358
Issue number2
DOIs
StatePublished - Aug 1 1990

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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