We report extensive differential V -band photometry and high-resolution spectroscopy for the 1.14 day , detached , double-lined eclipsing binary BT Vul ( F0+F7 ) .
Our radial-velocity monitoring and light curve analysis lead to absolute masses and radii of M _ { 1 } = 1.5439 \pm 0.0098 ~ { } \mathcal { M } _ { \sun } ^ { N } and R _ { 1 } = 1.536 \pm 0.018 ~ { } \mathcal { R } _ { \sun } ^ { N } for the primary , and M _ { 2 } = 1.2196 \pm 0.0080 ~ { } \mathcal { M } _ { \sun } ^ { N } and R _ { 2 } = 1.151 \pm 0.029 ~ { } \mathcal { R } _ { \sun } ^ { N } for the secondary .
The effective temperatures are 7270 \pm 150 K and 6260 \pm 180 K , respectively .
Both stars are rapid rotators , and the orbit is circular .
A comparison with stellar evolution models from the MIST series shows excellent agreement with these determinations , for a composition of { [ Fe / H ] } = +0.08 and an age of 350 Myr .
The two components of BT Vul are very near the zero-age main sequence .