[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.
Bibliographical reference

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

Advertised on:
0
2008
Number of authors
5
IAC number of authors
0
Citations
1
Refereed citations
0
Description
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.
Type
Non-refereed

It may interest you

  • Non-refereed
    Performance of the image persistence model for Euclid infrared detectors
    Large-format infrared detectors are at the heart of major ground and space-based astronomical instruments, and the HgCdTe HxRG is the most widely used. The Near Infrared Spectrometer and Photometer (NISP) of the ESA's Euclid mission launched in July 2023 hosts 16 H2RG detectors in the focal plane. Their performance relies heavily on the effect of
    Kubik, B. et al.

    Advertised on:

    8
    2024
    Bibcode
    2024SPIE13103E..15K
    Citations
    0
  • Non-refereed
    HARMONI at ELT: athermal toroidal mirror mount for HARMONI pre-optics
    HARMONI is the high angular resolution optical and near-IR integral field spectrograph for the Extremely Large telescope (ELT). It covers a large spectral range from 470nm to 2450nm with resolving powers from 3300 to 18000 and spatial sampling from 60mas to 4mas. The Instrument Pre-Optics (IPO), a sub-system under the responsibility of the
    Hernández, Elvio et al.

    Advertised on:

    8
    2024
    Bibcode
    2024SPIE13100E..34H
    Citations
    0
  • Non-refereed
    HARMONI at ELT: project status and instrument overview
    HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450 nm to 2450 nm with resolving powers from 3500 to 18000 and spatial sampling from 60 mas to 4 mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The
    Thatte, Niranjan A. et al.

    Advertised on:

    7
    2024
    Bibcode
    2024SPIE13096E..14T
    Citations
    0