On the possible variability of the main sequence A stars θ Virginis and 109 Virginis*
Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, U.S.A.
Accepted: 6 February 1997
Differential Strömgren uvby photometric observations from the Four College Automated Photoelectric Telescope are used to examine the possible variability of the spectrophotometric standards θ Vir and 109 Vir. No evidence is found for variability within a season of observation. Small year to year differences are most likely due to unaccounted for extinction changes.
Key words: stars: individual: θ Vir / stars: individual: 109 Vir / stars: variables: other
Tables 2 and 3 will be available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1997