RT info:eu-repo/semantics/bachelorThesis
T1 A chemical abundance analysis of P-rich star candidates
A1 Ciardella, Samuele
K1 Fosforo
K1 Espectro estelar
K1 Abundancia
K1 phosphorus
K1 abundance
K1 stellar spectrum
K1 cerium
K1 estrellas
K1 f´osforo
K1 abundancia
K1 espectro estelar
K1 cerio
AB In this memory will be analysed the work done on the spectra of 39 stars to determine ifthey can be included in the group of the P-rich stars, stars whose abundance of phosphorus ishigher than average.These stars are very important in order to explain the origin of the phosphorus found in ourgalaxy, currently underpredicted by chemical evolution models. On the other hand, last yearwere released an article that, analysing data from the APOGEE survey, presents the discoveryof the existence of stars with an abundance of P higher than normal, called P-rich [1]. In asecond work, were shown 39 stars with anomalies in their composition.[2] This project had asobjective to determine if these 39 stars were P-rich and if they presented a correlation betweenP and other elements (O,Mg, Al,Si and Ce). To do this we used the data, provided by theAPOGEE database, of the stars studied (H-band spectra, effective temperature, surface gravityand abundance of carbon, nitrogen and alpha elements, among others) as initial data of thespectral synthesis code BACCHUS, which provided the abundance of phosphorus and ceriumof these stars. We found that 37 stars (∼90%) are very rich in P ([P/Fe]>=1 dex) and richin Ce ([Ce/Fe]>0 dex). Then, we compared the P and Ce abundances with those from otherelements as well as with those observed in other stars with similar atmospheric parameters. Wefound that there is indeed the possibility of a correlation between phosphorous and oxyge, aswell between O and Si and between Al and Mg.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/25731
UL http://riull.ull.es/xmlui/handle/915/25731
LA es
DS Repositorio institucional de la Universidad de La Laguna
RD 06-may-2024