We present a detailed model for the magnetic field of the chemically peculiar star HD 119419 consistent with five different kinds of observational constraint: mean longitudinal field, crossover, mean quadratic field, projected equatorial velocity and stellar radius. The stellar surface presents a complex magnetic structure originated by a 17 kG dipole superposed to a 48 kG quadrupole, and inclu...

We present the results of comparing three different implementations of the microscopic diffusion process in the stellar evolution codes CESAM and CLES. For each of these implementations we computed models of 1.0, 1.2 and 1.3 M⊙. We analyse the differences in their internal structure at three selected evolutionary stages, as well as the variations of helium abundance and depth of the stellar con...

We study local stability of self-gravitating fluid and stellar disk in the context of modified gravity theories which predict a Yukawa-like term in the gravitational potential of a point mass. We investigate the effect of such a Yukawa-like term on the dynamics of self-gravitating disks. More specifically, we investigate the consequences of the presence of this term for the local stability of t...

The mapping between the distributions of the observed galaxy stellar mass and the underlying dark matter halos provides the crucial link from theories of large–scale structure formation to interpreting the complex phenomena of galaxy formation and evolution. We develop a novel statistical method, based on the Halo Occupation Distribution model (HOD), to solve for this mapping by jointly fitting...

We report new radio continuum observations with an angular resolution of 2 ′′ .1 at 1.4 GHz (20 cm) and 0 ′′ .28 at 8.4 GHz (3.6 cm), of the barred galaxy NGC 3367. In the map at 1.4 GHz, the central nuclear region connects to the SW lobe, with a projected structure of at a position angle of P.A.∼ 230 • , forming a jet-like structure. The map at 8.4 GHz shows a compact unresolved source (smalle...

The champagnemodel which describes the dynamical evolution of HII regions in the presence of a density discontinuity is reexamined including the effects of stellar winds. We consider stars with widely different ratios of ionizing flux to stellar wind power, as well as different distances between the star and the boundary of its parental molecular cloud. We also performed simulations with reduce...

the linear adiabatic pulsation-periods of mira variable stars have been derived. approximately 2701[1]models were calculated for m = 0.7 mθ to 2 mθ stars with radii from 180 rθ to 340 rθ and luminosities from 2800 lθ to 10,000 lθ. the chemical composition of all models is (x,z) = (0.7,0.02). from the result of this study, linear relations on luminosity-period-mass relationship and luminosity-pe...