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On the possible variability of the main sequence A stars θ Virginis and 109 Virginis

1997; EDP Sciences; Volume: 125; Issue: 3 Linguagem: Inglês

10.1051/aas

1286-4846

Saul J. Adelman,

Solar and Space Plasma Dynamics

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.