BVRI photometry of the extrinsic S star HR 1105 *
Received 20 October 1997 / Accepted 9 February 1998
BVRI photometry of the extrinsic S star HR 1105 shows a stable periodic light variability with a period of 24.76 days superimposed upon long term changes presumably related to the orbital period. The variations are in phase for all four magnitudes with the amplitude of this variability being about the same for B and V, but smaller for R and even smaller for I. As the primary is a M3 III star, these brightness changes are mostly likely due to the pulsation of the primary star.
Key words: stars: AGB, post AGB binaries: close stars:individual: HR 1105 stars: variables: other
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© European Southern Observatory (ESO) 1998
Online publication: April 28, 1998