This review has two parts. The first one is devoted to the Barbier–Chalonge–Divan (BCD)
spectrophotometric system, also known as the Paris spectral classification system. Although …

We present submilliarcsecond resolution imaging and modeling of two nearby rapid rotators
α Cephei and α Ophiuchi, obtained with the CHARA array—the largest optical/IR …

Context. Among intermediate-mass and massive stars, Be stars are the fastest rotators in the
main sequence (MS) and, as such, these stars are a cornerstone to validate models of …

Context. Asteroseismology of massive pulsating stars of β Cep and SPB types can help us to
uncover the internal structure of massive stars and understand certain physical phenomena …

High-resolution optical spectra of 57 Galactic B-type supergiant stars have been analysed to
determine their rotational and macroturbulent velocities. In addition, their atmospheric …

We show that the significantly different effective temperatures (T eff) achieved by the
luminous blue variable AG Carinae during the consecutive visual minima of 1985–1990 (T …

Context. Estimating the physical states of the surfaces of fast-rotating stars is challenging
due to several intrinsic processes, which include radiative flux inhomogeneities on the …

We have investigated the effects of uniform rotation and a specific model for differential
rotation on the pulsation frequencies of 10 M☉ stellar models. Uniform rotation decreases …

Context. Since the external regions of the envelopes of rapidly rotating early-type stars are
unstable to convection, a coupling may exist between the convection and the internal …

Aims. We assume that stars may undergo surface differential rotation to study its impact on
the interpretation of Vsini and on the observed distribution Φ (u) of ratios of true rotational …