ABSTRACT We present model atmosphere analysis for a sample of B-type stars in optical region to obtain their fundamental parameters e.g. effective temperature, surface gravities, and rotational velocities. Approximate masses for the sample of stars under study are obtained by comparing the resulted effective temperatures and surface gravities with the evolutionary tracks. Comparison between these masses and the empirical effective temperatures-mass relation revealed good agreement.
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nullS. Saad and M. Nouh, "Model Atmosphere Analysis of Some B-Type Stars," International Journal of Astronomy and Astrophysics, Vol. 1 No. 2, 2011, pp. 45-51. doi: 10.4236/ijaa.2011.12007.
 N. A. Sokolov, “The Determination of T_eff_ of B, A and F Main Sequence Stars from the Continuum between 3200 A and 3600 A,” Astronomy and Astrophysics, Vol. 110, 1995, pp. 553-564.
 T. Lanz and I. Hubeny, “A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-Type Stars,” The Astrophysical Journal Supplement Series, 2007, Vol. 169, No. 1, pp. 83-104. doi:10.1086/511270
 S. Ste? and T. Rivinius, “HEROS Be Star Campaigns,” ASP Conference Proceedings, Vol. 214, 2000, p. 356.
 P. Skoda and M. Slechta, “2-Meter Telescope Devices: Coudé Slit Spectrograph and HEROS,” Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic, No. 90, 2002, pp. 1-4.
 J. Horn, A. M. Hubert, H. Hubert, P. Koubsk'y and N. Bailloux, “CX Draconis—The Orbit Parameters for Both Components,” Astronomy and Astrophysics, 1992, Vol. 259, No. 1, pp. L5-L8.
 P. Skoda, “SPEFO—A Simple, Yet Powerful Program for One-Dimensional Spectra Processing,” ASP Conference Proceedings, Vol. 101, 1996, p. 187.
 S. M. Saad, J. Kubát, D. Kor?áková, P. Koubsky, P. ?koda, M. ?lechta, A. Kawka, A. Budovi?ová, V. Vo- truba, L. ?arounová and M. I. Nouh, “Observations of Hα, Iron, and Oxygen Lines in B, Be, and Shell Stars,” Astronomy and Astrophysics, Vol. 450, No. 1, 2006, pp. 427-430.
 R. L. Kurucz, “Synthetic Template Spectra,” Highlights of Astronomy, 1995, Vol. 10, p. 407.
 R. O. Gray, “The Calibration of Stromgren Photometry for A, F and Early G Supergiants. III—The A and Early F Supergiants,” Astronomy and Astrophysics, 1992, Vol. 265, No. 2, pp. 704-710.
 R. O. Gray, “Erratum: The Calibration of Stromgren Pho- tometry for A, F and Early G Supergiants. III. The A and Early F Supergiants,” Astronomy and Astrophysics, Vol. 273, 1993, p. 349.
 R. O. Gray, “Precision Classification,” ASP Conference Series, Vol. 60, 1994, p. 75.
 C. Allende-Prieto, “Automated Analysis of Stellar Spectra,” Astronomische Nachrichten, Vol. 325, No. 6-8, 2004, pp. 604-609.
 Q. Z. Zhang and F. Cheng, “Application of the Complete Linearization Method to the Analysis of Solar Prominence Emission Spectrum,” Acta Astronomica Sinica, Vol. 27, 1986, pp. 30-37.
 D. F. Gray, “The Observation and Analysis of Stellar Photospheres,” John Wiley & Sons, New York, 1976.
 L. Girardi, A. Bressan, G. Bertelli and C. Chiosi, “Evolutionary Tracks and Isochrones for Low- and Intermediate-Mass Stars: From 0.15 to 7 Msun, and from Z=0.0004 to 0.03,” Astronomy and Astrophysics Supplement, Vol. 141, 2000, pp. 371-383.
 W. W. Morgan, P. C. Keenan and E. Kellman, “An Atlas of Stellar Spectra, with an Outline of Spectral Classification, Ill,” The University of Chicago Press, Chicago, 1943.
 H. L. Johnson and W. W. Morgan, “Fundamental Stellar Photometry for Standards of Spectral Type on the Revised System of the Yerkes Spectral Atlas,” The Astrophysical Journal, Vol. 117, 1953, p. 313.
 R. M. Petrie, “A Re-Examination of the Space Motions and Luminosities of the Stars of the Cassiopeia-Taurus Group Based upon New Radial Velocities,” Monthly Notices of the Royal Astronomical Society, Vol. 118, 1958, p. 80.
 A. E. Tarasov, P. Harmanec, J. Horn, L. S. Lyubimkov, S. I. Rostopchin, P. Koubsky, C. Blake, V. V. Kostunin, G. A. H. Walker and S. Yang, “The Archetype Line-Profile Variable ? 45 Persei Is a Spectroscopic Triple System,” Astronomy and Astrophysics Supplement, Vol. 110, 1995, p. 59.
 W. W. Morgan, A. C. Code and A. E. Whitford, “Studies in Galactic STRUCTURE.II.LUMINOSITY Classification for 1270 Blue Giant Stars,” Astrophysical Journal Supplement, Vol. 2, 1955, p. 41. doi:10.1086/190016
 W. W. Morgan and P. C. Keenan, “Spectral Classification,” Annual Review of Astronomy and Astrophysics, Vol. 11, 1973, p. 29.
 D. H. McNamara, “Periods and Absolute Magnitudes of the Beta Canis Majoris Stars,” Publications of the Astronomical Society of the Pacific, Vol. 65, No. 387, 1953, p. 286. doi:10.1086/126627
 H. A. Abt and S. G. Levy, “Binaries among B2-B5 IV, V Absorption and Emission Stars,” Astrophysical Journal Supplement Series, Vol. 36, 1978, pp. 241-258.
 H. A. Abt, H. Levato and M. Grosso, “Rotational Velocities of B Stars,” The Astrophysical Journal, Vol. 573, No. 1, 2002, pp. 359-365. doi:10.1086/340590
 E. R. Mitchell, “Treasurer’s Report,” Monthly Notices of the Royal Astronomical Society, Vol. 9, 1911, p. 26.
 P. Koubsky, J. Horn, P. Harmanec, L. H. Iliev, B. Z. Kovacev, C. T. Bolton, R. W. Lions, H. Bozic and K. Pavlovski, “96 Herculis: A Remarkable Early-Type Multiple System,” Information Bulletin on Variable Stars, No. 2778, 1985, p. 1.
 A. Blaauw and T. S. van Albada, “Radial Velocities of B-Type Stars in the Nearest Associations,” Astrophysical Journal, Vol. 137, 1963, p. 791.
 K. C. Smith and M. M. Dworetsky, “Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra—Part One—Iron Peak Elements,” Astronomy and Astrophys, Vol. 274, No. 2, 1993, p. 335.
 W. Huang and D. R. Gies, “Stellar Rotation in Field and Cluster B Stars,” Astrophysical Journal, Vol. 683, No. 2, 2008, p. 1045. doi:10.1086/590106
 K. Lefever, J. Puls, T. Morel, C. Aerts, L. Decin and M. Briquet, “Spectroscopic Determination of the Fundamental Parameters of 66 B-Type Stars in the Field-of-View of the CoRoT Satellite,” Astronomy and Astrophysics, 2010, Vol. 515, p. 74.
 R. S. Levenhagen and N. V. Leister, “Spectroscopic Analysis of Southern B and Be Stars,” Monthly Notices of the Royal Astronomical Society, Vol. 371, No. 1, 2006, pp. 252-262. doi:10.1111/j.1365-2966.2006.10655.x
 E. L. Fitzpatrick and D. Massa, “Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry,” The Astronomical Journal, Vol. 129, No. 3, 2005, p. 1642.
 S. J. Adelman, “Spectrophotometry of B, A, and F stars,” Astrophysical Journal, Vol. 222, 1978, pp. 547-555.
 S. J. Adelman, “Elemental Abundance Analyses with DAO Spectrograms. VII—The Late Normal B Stars Pi Ceti, 134 Tauri, 21 Aquilae, and Nu Capricorni and the Use of RETICON Spectra,” Monthly Notices of the Royal Astronomical Society, Vol. 252, 1991, pp. 116-131.
 E. Theodossiou and E. Danezis, “The Stellar Temperature Scale for Stars of Spectral Types from O8 to F6 and the Standard Deviation of the MK Spectral Classification,” Astrophysics and Space Science, Vol. 183, No. 1, 1991, pp. 91-115.
 C. Morossi, M. L. Malagnini, “Observed and Computed Spectral Flux Distribution of Non-Supergiant O9-G8 Stars. III—Determination of T(eff) for the Stars in the Breger Catalogue,” Astronomy and Astrophysics Supplement Series, Vol. 60, 1985, pp. 365-372.
 J. S. Adelman, O. I. Pintado, M. F. Nieva, K. E. Rayle and S. E. Sanders Jr., “On the Effective Temperatures and Surface Gravities of Superficially Normal Main Sequence Band B and A Stars,” Astronomy and Astrophys, Vol. 392, 2002, pp. 1031-1037.
 Y. Frémat, J. Zorec, A.-M. Hubert and M. Floquet, “Effects of Gravitational Darkening on the Determination of Fundamental Parameters in Fast-Rotating B-Type Stars,” Astronomy and Astrophys, Vol. 440, No. 1, 2005, pp. 305-320.
 H. A. McAlister, T. A. Brummelaar, D. R. Gies, W. Huang, W. G. Bagnuolo Jr., M. A. Shure, J. Sturmann, L. Sturmann, N. H. Turner, S. F. Taylor, D. H. Berger, E. K. Baines, E. Grundstrom, C. Ogden, S. T. Ridgway and G. van Belle, “First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator α Leonis (Regulus),” Astrophysical Journal, 2005, Vol. 628, No. 1, pp. 439-452. doi:10.1086/430730