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A DOUBLE WHITE-DWARF COOLING SEQUENCE IN ω CENTAURI
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DOI：10.1088/2041-8205/769/2/L32.png)
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摘要
En 中文
We have applied our empirical-point-spread-function-based photometric techniques on a large number of calibration-related WFC3/UVIS UV-B exposures of the core of omega Cen, and found a well-defined split in the bright part of the white-dwarf cooling sequence (WDCS). The redder sequence is more populated by a factor of similar to 2. We can explain the separation of the two sequences and their number ratio in terms of the He-normal and He-rich subpopulations that had been previously identified along the cluster main sequence. The blue WDCS is populated by the evolved stars of the He-normal component (similar to 0.55 M-circle dot CO-core DA objects), while the red WDCS hosts the end products of the He-rich population (similar to 0.46 M-circle dot objects, and similar to 10% CO-core and similar to 90% He-core WDs). The He-core WDs correspond to He-rich stars that missed the central He ignition, and we estimate their fraction by analyzing the population ratios along the cluster horizontal branch.
Keyword:
globular clusters: individual (NGC 5139)
Hertzsprung-Russell and C-M diagrams
stars: Population II
techniques: photometric
white dwarfs
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11.7
论文数:
1.2W
被引数:
5.9W
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分享收藏NEW HUBBLE SPACE TELESCOPE WFC3/UVIS OBSERVATIONS AUGMENT THE STELLAR-POPULATION COMPLEXITY OF ω CENTAURI.png)
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OAAI分享收藏HUBBLE SPACE TELESCOPE OBSERVATIONS OF AN OUTER FIELD IN OMEGA CENTAURI: A DEFINITIVE HELIUM ABUNDANCEASTRONOMICAL JOURNALOAAI
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