https://github.com/gabraganca/iau307_massive_stars

Material for the IAU 307 symposium about massive stars.
https://github.com/gabraganca/iau307_massive_stars

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Material for the IAU 307 symposium about massive stars.

• Host: GitHub
• URL: https://github.com/gabraganca/iau307_massive_stars
• Owner: gabraganca
• Created: 2014-02-24T10:18:08.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2014-07-07T09:26:27.000Z (over 10 years ago)
• Last Synced: 2024-10-28T14:47:10.706Z (2 months ago)
• Homepage: http://gabraganca.github.io/IAU307_massive_stars
• Size: 313 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# A Spectroscopic Study of OB Stars Located in the Outer Galactic Disk

This work was presented in the IAU symposium 307 entitled [New Windows on Massive Stars](http://obswww.unige.ch/Conferences/IAU307/index.html) which happened in Geneva, Switzerland, from 22 to 27 of June 2014.

The format of the presentation was **poster**.

**Authors** Bragança, G.; Lanz, T.; Daflon, S.; Cunha, K.; Garmany, C. D.; 

            Glaspey, J. W.; Borges Fernandes, M.; Oey, M. S.; Bensby, T.

**Abstract:**

Abundance gradients are observed in other galaxies, with their metallicities 

decreasing outwards from the galactic centers. The abundance slopes for different 

elements may vary depending on the galactic morphology. In our Galaxy, the radial 

abundance gradients remain somewhat uncertain on the outer parts of the Galactic 

disk, due to the small number of studied stars located beyond the Perseus Arm. The 

aim of this study is to provide a large abundance database of distant stars in order 

to better constrain the Galactic gradient in the Outer Disk. We have obtained 

high-resolution, echelle spectra for a sample of 137 OB stars located towards the 

Galactic anti-center using the 6.5m Magellan Clay telescope + MIKE spectrograph. A 

subsample of 50 single stars presenting sharp absorption lines has been selected to 

carry out the abundance analysis. Stellar parameters, Silicon and Oxygen abundances 

are derived consistently based on non-LTE synthesis of hydrogen, helium, Silicon and 

Oxygen lines, requiring ionization balance of SiII/III/IV and O I/II/III. In this work, 

we present preliminary abundance results of our analysis.

You can download the poster [here](http://dx.doi.org/10.6084/m9.figshare.1050565).

Please, cite this work as

Bragança, Gustavo; Lanz, T.; Daflon, S.; Cunha, K.; Garmany, C. D.; Glaspey, J. W.; Borges Fernandes, M.; Oey, M. S.; Bensby, T. (2014): A Spectroscopic Study of OB Stars Located on the Outer Galactic Disk. figshare. 

http://dx.doi.org/10.6084/m9.figshare.1050565

**Acknowledgements:**

We acknowledge financial support of National Science Foundation, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

 and the International Astronomomic Union. This research has made use of the SIMBAD database,

operated at CDS, Strasbourg, France and of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2013).