Old stellar population synthesis: new age and mass estimates for Mayall II = G1
نویسندگان
چکیده
منابع مشابه
Old stellar population synthesis : New age and mass estimates for Mayall II = G 1
Mayall II = G1 is one of the most luminous globular clusters (GCs) in M31. Here, we determine its age and mass by comparing multicolor photometry with theoretical stellar population synthesis models. Based on farand near-ultraviolet GALEX photometry, broad-band UBV RI , and infrared JHKs 2MASS data, we construct the most extensive spectral energy distribution of G1 to date, spanning the wavelen...
متن کاملStructural Parameters of Mayall II = G1 in M31
Mayall II = G1 is one of the most luminous globular clusters (GCs) known in M31. New deep, high-resolution observations with the Advanced Camera for Surveys on the Hubble Space Telescope are used to provide accurate photometric data to the smallest radii yet. In particular, we present the precise variation of ellipticity and position angle, and of surface brightness for the core of the object. ...
متن کاملsynthesis and characterization of some new cyclometalated organoplatinum(ii) complexes containing phosphite ligand
در این تحقیق روشی جهت سنتز یک سری از کمپلکس های پلاتین (ii) حاوی لیگاند های دهنده ی فسفری شامل فسفیت و فسفین ارائه شده است. واکنش پیش ماده ی پلاتین (ii)،trans/cis- [ptcl2(sme2)2] ، با 2 اکی مولار از لیگاند p(oph)3در حلال بنزن کمپلکس1، cis-[ptcl2(p(oph)3)2] را تولید می نماید. جهت سنتز کمپلکس سایکلو متال فسفیتی، کمپلکس 1 با 1 اکی والان واکنشگر ptcl2 در حلال زایلن در شرایط رفلاکس زیر گاز آرگون م...
Stellar population synthesis diagnostics
A quantitative method is presented to compare observed and synthetic colour-magnitude diagrams (CMDs). The method is based on a χ merit function for a point (ci,mi) in the observed CMD, which has a corresponding point in the simulated CMD within nσ(ci,mi) of the error ellipse. The χ merit function is then combined with the Poisson merit function of the points for which no corresponding point wa...
متن کاملOptimization of Starburst99 for Intermediate-Age and Old Stellar Populations
We have incorporated the latest release of the Padova models into the evolutionary synthesis code Starburst99. The Padova tracks were extended to include the full asymptotic giant branch (AGB) evolution until the final thermal pulse over the mass range 0.9 to 5 M⊙. With this addition, Starburst99 accounts for all stellar phases that contribute to the integrated light of a stellar population wit...
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ژورنال
عنوان ژورنال: Research in Astronomy and Astrophysics
سال: 2009
ISSN: 1674-4527
DOI: 10.1088/1674-4527/9/6/003