Speaker
Description
Chemically peculiar stars, such as the recently discovered metal-poor ([Fe/H]$\sim$-1) phosphorus-rich stars, query the current theories on stellar nucleosynthesis and galactic chemical evolution. Consequently, the origin of these stars, their progenitors and hence the source of phosphorus in the Galaxy remains unclear.
In this study, we achieved a remarkable enlargement of the P-rich stars sample, from originally 15 to approximately 85 stars. Based on the high resolution near-IR (H-band) spectra from the SDSS-IV/APOGEE-2 survey (DR17), a detailed abundance analysis of 13 elements, C, N, O, Na, Mg, Al, S, Si, Fe, Ce, Nd, P, Ca has been successfully performed on the new enlarged sample using the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS). As a result, we report overabundances of several elements, such as O, Mg, Al, Si and Ce, confirming strong correlations between phosphorus and other elements. These correlations put important constraints on the search for the P-rich stars progenitors and the nucleosynthetic mechanism behind the unusual abundance patterns of the P-rich stars.
| Length of presentation requested | Oral presentation: 8 min + 2 min questions (Poster-type talk) |
|---|---|
| Please select between one and three keywords related to your abstract | Stellar evolution |
| 2nd keyword (optional) | Nucleosynthesis |
| 3rd keyword (optional) | Chemical Evolution: the Milky Way |
