The frequency by mass of Galactic carbon stars inferred from Gaia measurements of star cluster members
| Autor: | Pal, Tathagata, Worthey, Guy |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, Volume 506, Issue 3, September 2021, Pages 3669-3677 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stab1967 |
| Popis: | We investigate the frequency of occurrence of Galactic carbon stars as a function of progenitor mass using Gaia data. Small number statistics limit fidelity, but C star frequency agrees with that observed in the Magellanic Clouds (MCs) down to $m \approx1.67$ M$_\odot$. At $m \approx 1.38$ M$_\odot$, the frequency rises by a factor of three even though the frequency appears to drop to zero for the MCs. In fact this is due to a lack of clusters at the key age range in the MCs. At $m \approx 1.24$ M$_\odot$ and below, no C stars are observed, corresponding to ages older than 4 Gyr. Within uncertainties, C~star frequency in M 31 is consistent with that of the Galaxy and the MCs. We find an ambiguous C-star candidate at $\sim$7 M$_\odot$. Comment: 10 pages, 8 figures, 4 tables. Accepted in MNRAS |
| Databáze: | arXiv |
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