ODC 174.7 Picea abies 181.521: 165.4 (455) T h e female and male flowering frequency >*'ere studied in a clone frial o j Picea abies at Roskar nine kilonzeters north-east of Stockholm. During 1971 the e s t m ~ i o n in time of pollen shedding and fenzale receptivity was recorded follo~ving daily esurnination of individual strobili. T h e data obtained revealed a great variation in fenlale as w...

The weak s process takes place in massive stars and it produces the majority of s-only isotopes in the atomic mass range from 60 to 90. This process is qualitatively well understood. However, there are still large uncertainties remaining on the quantitative side. Rotation has a strong effect on the stellar structure and mixing, but its impact on the s process has not been studied yet. We implem...

$\tau$ Sco, a well-studied magnetic B-type star in the Upper Sco association, has number of surprising characteristics. It rotates very slowly and shows nitrogen excess. Its surface field is much more complex than purely dipolar configuration which unusual for massive star. We employ CMFGEN radiative transfer code to determine fundamental parameters CNO helium abundances. Then, we MESA GENEC st...

Context. The formation of supermassive black holes possibly takes place via direct collapse, with a star (SMS) as its progenitor. In this scenario, the SMS accretes at > 0.1 M ? yr ?1 until it collapses into massive hole seed result general-relativistic (GR) instability. However, exact mass which collapse occurs is not known, existing numerical simulations give us divergent range results. Ai...

ABSTRACT GW190521 is a merger of two black holes (BHs), wherein at least one BH lies within the pair-instability (PI) mass gap, and it difficult to form because effects PI supernovae pulsational (PPI). In this study, we examined formation GW190521-like BH-BHs under Population (Pop) III environments by binary population synthesis calculations. We reveal that convective overshooting in stellar ev...

This work presents new $^{12}$C + reaction rates in the form of numerical tables with associated uncertainty estimation, as well analytical formulae that can be directly implemented into stellar evolution codes. article further describes impact these on C-burning stars. We determine for two cross-section extrapolation models: one based fusion-hindrance phenomenon, and other plus a resonance, co...

diallel crosses of eight genotypes of safflower were conducted and f1 and f2 generations were evaluated to estimate genetic parameters for seed-quality related traits including protein contents (%), fiber, ash and oil yeild. griffing’s methods 1 and 2 for f1 and f2 generations was used, respectively. sixty four genotypes including 8 parents and 56 f1 progenies, and half diallel crosses of f2 ge...

Context. B supergiants (BSGs) are evolved stars with effective temperatures between ~10 to ~30 kK. Knowing the properties of these objects is important understand massive star evolution. Located on cool end line-driven wind regime, study their atmospheres can help us physics winds and phenomena such as bi-stability jump. Aims. Despite being well-studied stars, key UV features spectra have so fa...