منابع مشابه
Post-AGB stars as testbeds of nucleosynthesis in AGB stars
We construct a data base of 125 post-AGB objects (including R CrB and extreme helium stars) with published photospheric parameters (effective temperature and gravity) and chemical composition. We estimate the masses of the postAGB stars by comparing their position in the (log Teff , log g) plane with theoretical evolutionary tracks of different masses. We construct various diagrams, with the ai...
متن کاملNear - IR spectra of IPHAS extremely red Galactic AGB stars
We present a library of 139 near-IR spectra of cool asymptotic giant branch stars that will be useful for comparison with theoretical model atmosphere calculations and for modeling the integrated emission from intermediate-age stellar populations. The source list was selected from the “extremely red” region of the INT Photometric Hα Survey (IPHAS) colour-colour plane that is overwhelmingly domi...
متن کاملMid - IR period - magnitude relations for AGB stars
Asymptotic Giant Branch variables are found to obey period-luminosity relations in the mid-IR similar to those seen atKS (2.14μm), even at 24μm where emission from circumstellar dust is expected to be dominant. Their loci in the M , logP diagrams are essentially the same for the LMC and for NGC6522 in spite of different ages and metallicities. There is no systematic trend of slope with waveleng...
متن کاملThe mid - and far - infrared colours of AGB and post - AGB stars ⋆
With the advent of space missions, like SPITZER and ASTRO-F, with sensitive detectors in the near-and mid-infra red covering a reasonable field-of-view and having a good spatial resolution, it will be possible to detect individual AGB stars in Local Group galaxies. The filters used by these missions are non-standard and different from mission to mission. In this paper, the colours of mass-losin...
متن کاملHow to search for AGB stars in near-IR post-starburst spectra
Based on evolutionary spectral synthesis models explicitly including the spectra of variable AGB stars, we select near-IR features that dentify the strong O-rich or C-rich AGB contributions to the near-IR light of post-starburst populations. AGB temperature scales and lifetimes remain major sources of uncertainties. We discuss applications and suggest massive post-starburst clusters as prime ta...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1993
ISSN: 0074-1809
DOI: 10.1017/s0074180900171098