Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne–Żytkow Object and Super-AGB Star Candidates
نویسندگان
چکیده
In previous work we identified a population of 38 cool and luminous variable stars in the Magellanic Clouds examined 11 detail order to classify them as either Thorne-\.Zytkow Objects (T\.ZOs, red supergiants with neutron star cores) or super-AGB (the most massive that will not undergo core collapse). This includes HV\,2112, peculiar previously considered other works be T\.ZO high-mass AGB star. Here continue this investigation, using kinematic radio environments local formation history these place constraints on age progenitor systems presence past supernovae. These are associated regions recent formation, find no evidence supernovae at their locations. Finally, also assess heavy elements lithium spectra compared supergiants. We strong absorption Li s-process RSGs sample, consistent nucleosynthesis, while HV\,2112 shows additional lines nucleosynthesis. Coupled our mass estimates, results being (~4-6.5M$_{\odot}$) (~6.5-12M$_{\odot}$) thermally pulsing phase, providing crucial observations transition between low- stellar populations. is more ambiguous; it could maximally sAGB star, if minimum for stability extends down <13 M$_\odot$.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2023
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/aca655