منابع مشابه
Ju n 19 99 Stellar iron abundances : non - LTE effects
Received ; accepted – 2 – ABSTRACT We report new statistical equilibrium calculations for Fe I and Fe II in the atmosphere of Late-Type stars. We used atomic models for Fe I and Fe II having respectively 256 and 190 levels, as well as 2117 and 3443 radiative transitions. Photoionization cross-sections are from the Iron Project. These atomic models were used to investigate NLTE (non local themod...
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An SDDS contains data records. Every record is identified by a primary key or by several keys. Records are stored in buckets at server nodes called (SDDS) servers. They are manipulated from client nodes called (SDDS) clients. The key value(s) determines the address of the bucket where the record should be. An SDDS file starts at one storage site. Inserts scale the file incrementally through spl...
متن کاملStellar Populations in the Central Galaxies of Fossil Groups
It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...
متن کاملM ar 1 99 8 The Resolved Stellar Population of the Post - Starburst Galaxy NGC 1569
We present WFPC2–HST photometry of the resolved stellar population in the post-starburst galaxy NGC 1569. The color-magnitude diagram (CMD) derived in the F439W and F555W photometric bands contains ∼2800 stars with photometric error ≤ 0.2 mag down to mF439, mF555 ≃ 26, and is complete for mF555 ∼ < 23. Adopting the literature distance modulus and reddening, our CMD samples stars more massive th...
متن کامل0 M ar 1 99 8 The Evolution of Blue Stragglers Formed Via Stellar Collisions
We have used the results of recent smoothed particle hydrodynamic simulations of colliding stars to create models appropriate for input into a stellar evolution code. In evolving these models, we find that little or no surface convec-tion occurs, precluding angular momentum loss via a magnetically-driven stellar wind as a viable mechanism for slowing rapidly rotating blue stragglers which have ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1991
ISSN: 0074-1809
DOI: 10.1017/s0074180900046052