A5004231479- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
Chalmers University of Technology
2021
University College London
2018-2019
Massive stars play an important role in both cluster and galactic evolution the rate at which they lose mass is a key driver of their own interaction with environment up to including SNe explosions. Young massive clusters provide ideal opportunity study co-eval population stars. We performed 3mm continuum observations Atacama Large Millimetre/submillimetre Array Galactic Westerlund 1, constituent determine mass-loss rates for diverse post-main sequence population. detected emission from 50...
We report new 5.5 GHz radio observations of the massive star cluster Westerlund 1, taken by Australia Telescope Compact Array, detecting nine ten yellow hypergiants (YHGs) and red supergiants (RSGs) within cluster. Eight sources are spatially resolved. The nebulae associated with YHGs Wd1-4a, -12a -265 demonstrate a cometary morphology - first time this phenomenon has been observed for such stars. This structure is also echoed in ejecta RSGs Wd1-20 -26; each case tails directed away from...
Massive stars and their stellar winds are important for a number of feedback processes. The mass lost in the wind can help determine end-point star as NS or BH. However, impact mass-loss on post-Main Sequence evolutionary stage massive is not well understood. Westerlund 1 an ideal astrophysical laboratory which to study great detail over large range different phases. Aims: We aim radio emission from 1, order measure fluxes population stars, rates spectral indices where possible. Methods:...
Despite their large impact on stellar and galactic evolution, the properties of outflows from red supergiants are not well characterised. We used Onsala 20m telescope to perform a spectral survey at 3mm 4mm (68 - 116 GHz) supergiant NML Cyg, alongside yellow hypergiant IRC+10420. Our observations Cyg were combined with complementary archival data enable search for signatures morphological complexity in circumstellar environment, using emission lines 15 molecular species. The recovered...