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Astron. Astrophys. 333, 952-955 (1998)

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BVRI photometry of the extrinsic S star HR 1105 *

S.J. Adelman

Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, USA (Adelmans@Citadel.Edu)

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

* Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: S.J. Adelman

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998