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Model atmosphere analysis of two new early–type O4 dwarfs stars

D.A. Fouda

D.A. Fouda

National Research Institute of Astronomy and Geophysics (NRIAG), Department of Astronomy, Stellar LabCairo, Egypt
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Fouda, D.A.
, 
M. Hamdy

M. Hamdy

National Research Institute of Astronomy and Geophysics (NRIAG), Department of Astronomy, Stellar LabCairo, Egypt
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Hamdy, M.
, 
M. Nouh

M. Nouh

National Research Institute of Astronomy and Geophysics (NRIAG), Department of Astronomy, Stellar LabCairo, Egypt
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Nouh, M.
, 
M. Beheary

M. Beheary

Department of Astronomy and Meteorology, Faculty of Science, El Azhar UniversityCairo, Egypt
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Beheary, M.
, 
Abdelaziz Bakrey

Abdelaziz Bakrey

Department of Astronomy and Meteorology, Faculty of Science, El Azhar UniversityCairo, Egypt
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Bakrey, Abdelaziz
 and 
S. M. Saad

S. M. Saad

  • National Research Institute of Astronomy and Geophysics (NRIAG), Department of Astronomy, Stellar LabCairo, Egypt
  • Kottamia Centre of Scientific Excellence for Astronomy and Space ScienceCairo, Egypt
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Saad, S. M.
  
Dec 25, 2017
Model atmosphere analysis of two new early–type O4 dwarfs stars's Cover Image
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Published Online: Dec 25, 2017
Page range: 559 - 564
Received: Mar 09, 2017
Accepted: Dec 25, 2017
DOI: https://doi.org/10.21042/AMNS.2017.2.00046
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© 2017 D.A. Fouda, M. Hamdy, M. Nouh, M. Beheary, Abdelaziz Bakrey, S. M. Saad, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

We present a synthetic spectra study of two new galactic early-type O4 dwarf stars(ALS 19618 and BD+50886) with high signal-to-noise ratio, typically S/N ∼ 300, medium-rosalution R ∼ 2500 optical spectra of O4 dwarfs stars from Galactic O-Stars Spectroscopic Survey (GOSSS), The main stellar parameters (Teff, surface gravity, rotational velocity) have been established using non-LTE, line-blanketed, atmospheric models calculated by TLUSTY204 and SYNSPEC49.

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