3-11 July 2007
Merida, Mexico
Mexico/General timezone
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Contribution Poster

Merida, Mexico - Regency (Hyatt)

The Dependence of the 22Ne/20Ne Ratio on the Distribution of Massive Stars in the Galaxy

Speakers

  • Dr. Ashraf FARAHAT

Primary authors

Abstract content

In this paper we are introducing a technique to show the variation of the 22Ne/20Ne ratio at different galactic locations and the dependence of this ratio on the distribution of massive stars in the galaxy. Most of the previously developed models focused on explaining the ratio variation between the galactic and solar 22Ne/20Ne but never pointed out to the possibility of variation of the 22Ne/20Ne ratio at different galactic locations. We examined the 22Ne/20Ne ratio at different galactic locations outside the solar system. We show that the distribution of the massive stars in the galaxy have a major effect on the abundance ratio which means that this anomaly in the ratio is not something unique between the solar system and the galactic cosmic rays. In this paper we will concentrate on the effect of the Wolf-Rayet (WR) stars with initial masses generally 40 times larger than the mass of the Sun. The flexibility of this technique will allow us to individually examine all the sources that can produce a certain cosmic ray nuclei in the galaxy and estimate the probability of survival of the 22Ne as a function of the radial distance of the WR star from the solar system.

Reference

Proceedings of the 30th International Cosmic Ray Conference; Rogelio Caballero, Juan Carlos D'Olivo, Gustavo Medina-Tanco, Lukas Nellen, Federico A. Sánchez, José F. Valdés-Galicia (eds.); Universidad Nacional Autónoma de México, Mexico City, Mexico, 2008; Vol. 2 (OG part 1), pages 105-108