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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
Keywords
© 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.

Fig. 1

Best fit (black dotted line) of the observed (gray line) of ALS 19618.The upper figure shows the whole fit to the blue-violet spectrum, The lower figure shows detailed fits for the standard diagnostic lines of He and H . The effective temperature is 42900 K, log g=4.00 and vsini=210 km s−1.
Best fit (black dotted line) of the observed (gray line) of ALS 19618.The upper figure shows the whole fit to the blue-violet spectrum, The lower figure shows detailed fits for the standard diagnostic lines of He and H . The effective temperature is 42900 K, log g=4.00 and vsini=210 km s−1.

Fig. 2

Best fit (black dotted line) of the observed (gray line) of BD+50886.The upper figure shows the whole fit to the blue-violet spectrum, The lower figure shows detailed fits for the standard diagnostic lines of He and H . The effective temperature is 44000 K, log g=3.95 and vsini=150 km s−1.
Best fit (black dotted line) of the observed (gray line) of BD+50886.The upper figure shows the whole fit to the blue-violet spectrum, The lower figure shows detailed fits for the standard diagnostic lines of He and H . The effective temperature is 44000 K, log g=3.95 and vsini=150 km s−1.

Observational data of two new galagtic O4V stars from GOSSS_

StarRA (hms)dec (dms)spectral type

Spectral type are taken from Maíz Apellániz, J. et al. 2016 [8]

VB-V
ALS 1961818 : 20 : 34.493-16 : 10 : 11.85O4 V (n)((fc))11.29+1.11
BD+5088604 : 03 : 20.736+51 : 18 : 52.46O4 V ((fc))11.22+1.05

Steller Parameters of the program stars_

Starspectral typeTeff (kK)Log (g)vsini (km s−1)
ALS 19618 O4 V (n)((fc))42.9 ± 1.04.00 ± 0.1210
BD+50886O4 V ((fc))44.0 ± 1.03.95 ± 0.1150
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