[C/O] Observations in Low-[Fe/H] Halo Stars

Bibcode
2008psa..conf...45F
DOI
10.1007/978-3-540-75485-5_10
Fabbian, D.; Nissen, P. E.; Asplund, M.; Akerman, C. J.; Pettini, M.
Referencia bibliográfica

Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 2008 pp. 45-46

Fecha de publicación:
0
2008
Número de autores
5
Número de autores del IAC
0
Número de citas
1
Número de citas referidas
0
Descripción
We have observed 15 halo stars to determine the [C/O] behaviour at low [Fe/H]. Making use of our recent non-LTE calculations, which show that the high excitation C and O lines used in previous studies in the literature are affected by very significant departures from LTE, we aim to obtain accurate [C/O] ratios down to [Fe/H]˜ —3.2, which will enable us to shed light on the possible presence of an upturn of [C/O] at low metallicities.
Tipo
Sin árbitro

Te puede interesar

  • Sin árbitro
    A machine learning method to infer clusters of galaxies mass radial profiles from mock Sunyaev-Zel'dovich maps with The Three Hundred clusters
    Our study introduces a new machine learning algorithm for estimating 3D cumulative radial profiles of total and gas mass in galaxy clusters from thermal Sunyaev-Zel'dovich (SZ) effect maps. We generate mock images from 2522 simulated clusters, employing an autoencoder and random forest in our approach. Notably, our model makes no prior assumptions
    Ferragamo, A. et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024EPJWC.29300019F
    Número de citas
    0
  • Sin árbitro
    The European Low Frequency Survey. Observing the radio sky to understand the beginning of the Universe
    In this paper we present the European Low Frequency Survey (ELFS), a project that will enable the detection of primordial B-mode polarization by measuring the Galactic and extra-Galactic foregrounds in the 5- 120 GHz frequency window. Indeed, the main difficulty in measuring the Bmode polarization comes not just from its sheer faintness, but from
    Mennella, A. et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024EPJWC.29300031M
    Número de citas
    0
  • Sin árbitro
    Estimation of the hydrostatic-to-lensing mass bias from resolved cluster masses
    We present a study on the bias of hydrostatic masses with respect to lensing mass estimates for a sample of 53 clusters in a redshift range between z = 0.05 and 1.07. The M 500 mass for each cluster was inferred from X-ray and lensing data, without using a priori observable-mass scaling relations. Cluster masses of our reference analysis were
    Muñoz-Echeverría, M. et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024EPJWC.29300033M
    Número de citas
    0