Journal
ASTRONOMY & ASTROPHYSICS
Volume 541, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201219102
Keywords
techniques: interferometric; techniques: high angular resolution; stars: variables: Cepheids; stars: distances; stars: oscillations
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Funding
- National Science Foundation [AST-0908253]
- Georgia State University
- W. M. Keck Foundation
- Packard Foundation
- NASA Exoplanet Science Institute
- PHASE
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [908253] Funding Source: National Science Foundation
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We report the first angular diameter measurements of two classical Cepheids, FF Aql and T Vul, that we obtain using observations with the FLUOR instrument installed at the CHARA interferometric array. We derive average limb-darkened angular diameters of theta(LD) = 0.878 +/- 0.013 mas and theta(LD) = 0.629 +/- 0.013 mas, respectively, for FF Aql and T Vul. Combining these angular diameters with the HST-FGS trigonometric parallaxes leads to linear radii R = 33.6 +/- 2.2 R-circle dot and R = 35.6 +/- 4.4 R-circle dot, respectively. The comparison with empirical and theoretical period-radius relations leads to the conclusion that these Cepheids are pulsating in their fundamental mode. The knowledge of this pulsation mode is of prime importance to calibrating the period-luminosity relation with a uniform sample of fundamental mode Cepheids.
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