Cool Supergiants in the Solar Neighborhood

Abundances of cool supergiants in the SMC young cluster NGC 330 ?

NGC 330 is the brightest SMC young cluster and contains many bright supergiants. This cluster has aroused special interest, since the earlier abundance determinations indicated an abundance lower by a factor ∼5 than in the SMC field young population. Taking advantage of our previous high resolution analysis of a sample of type K supergiants in the SMC field (Paper I and II), we analyse 6 cool s...

Solar Radiation Absorbed on the Neighborhood Scale regarding the Rural Fabric in Cold Climate Regions

Environmental subjects, in general, and energy issues, in particular, do not have a prominent role in rural research projects in Iran, and this is accompanied by negative environmental consequences, such as excessive energy consumption in rural housing. A significant amount of energy in villages is used up by dwellings, and the form of rural fabric is a major factor affecting this issue. Most o...

Carbon , nitrogen , oxygen and lithium abundances of six cool supergiants in the SMC ?

Carbon, nitrogen and oxygen abundances were derived from high-resolution spectra of 6 cool supergiants of the Small Magellanic Cloud. Oxygen-to-iron ratios (mean value [O/Fe] ≈–0.18 dex) are found to be similar to those found in young objects in the LMC and the Galaxy. This result is discussed in terms of chemical evolution. A mean deficiency of the carbon-to-iron ratio of [C/Fe] ≈–0.3 dex and ...

0 Stellar Pollution in the Solar Neighborhood

We study spectroscopically determined iron abundances of 642 solar-type stars to search for the signature of accreted iron-rich material. We find that the metallicity [Fe/H] of a subset of 466 main sequence stars, when plotted as a function of stellar mass, mimics the pattern seen in lithium abundances in open clusters. Using Monte Carlo models we find that, on average, these stars have accrete...

Solar Thrill: Using the Sun to Cool Vaccines