Photoionization Models of Metal-poor Extragalactic H 0 Regions and the Primordial Helium Abundance

Bibcode
2003RMxAC..18...56L
Luridiana, V.; Peimbert, A.; Peimbert, M.
Referencia bibliográfica

The Eight Texas-Mexico Conference on Astrophysics (Eds. M. Reyes-Ruiz & E. Vázquez-Semadeni) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 18, pp. 56-59 (2003) (http://www.astroscu.unam.mx/~rmaa/)

Fecha de publicación:
9
2003
Número de autores
3
Número de autores del IAC
0
Número de citas
0
Número de citas referidas
0
Descripción
We discuss the effects of collisional enhancement of Balmer lines on the determination of the primordial helium abundance. To this aim, we present a photoionization model of the metal-poor extragalactic H 0 region SBS 0335-052. We show that the derived helium abundance (Y) of this H 0 region depends on the amount of collisional excitation affecting the Balmer lines, both directly (through an underestimation of the actual He/H ratio) and indirectly (through an overestimation of the interstellar reddening). We detail how each of these effects affects the derived value of Y.
Tipo
Sin árbitro
Galaxias
Regiones H II

Te puede interesar

  • Sin árbitro
    ROSALIA: ROman Sky Analyst for Low surface brightness Imaging & Astronomy
    Diffuse emission in the outskirts of galaxies, such as stellar tidal streams, galaxy stellar halos and intracluster light, provides important constraints on the structure and evolution of the Universe. However, such low surface brightness diffuse emission can be up to thousands of times dimmer (>29 AB mag/[square arcseconds]) than the sky
    Laine, Seppo et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024AAS...24412902L
    Número de citas
    0
  • Sin árbitro
    A Systematic Search for and Characterization of White Dwarf Binaries Across the H-R Diagram
    White dwarfs (WDs) are the endpoint of evolution for 97% of stars. Most of these stars are in multiple systems, and a significant fraction of those are compact enough to exchange mass, altering the structures and subsequent evolution of both stars. The physical mechanisms that facilitate these mass exchanges include common envelope evolution, Roche
    Anguiano, Borja et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024AAS...24410807A
    Número de citas
    0
  • Sin árbitro
    The molecular gas perspective on the growth and death of H emitters in the Spiderweb protocluster at Alpha z=2.16
    Galaxy clusters at low redshift are dominated by massive quiescent galaxies hosting stellar populations 10 Gyrs old, indicating that they were formed in the early universe when clusters were still in the process of being assembled (i.e., protoclusters). The rapid growth of galaxies within protoclusters is driven by the efficient transformation of
    Martinez, J. M. P.

    Fecha de publicación:

    3
    2024
    Bibcode
    2024aecc.conf...12M
    Número de citas
    0