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M. I. Nouh

Publications and source records attributed to M. I. Nouh.

24 records · Page 2Linked to original sources
arXiv2014

A Holistic Study of the W UMa Binary EQ Tau

We present a new BVR light curves of the system EQ Tau carried out in the period from March to April 2006 using a 50 cm F/8.4 Ritchey Chretien telescope of the Baja Astronomical Observatory (Hungary, and 512*512 Apogee AP-7 CCD camera). The observed light curves were analyzed using the 2009 version of the Wilson-Devinney code. The results show that the more massive component is hotter than the low massive one by 99 K. A long term orbital period study shows that the period increases by the rate 8.946*10^(-11) day/cycle. Evolutionary state of the system has been investigated and showed that, the primary component of the system is located nearly on the ZAMS for both the M-L and M-R relations. The secondary component is close to the TAMS track for M-L and above the M-R relations.

astro-ph.SR↗
arXiv2014

First Orbital Solution and Evolutionary State for the Newly Discovered Eclipsing Binaries USNO-B1.0 1091-0130715 and GSC-03449-0680

First photometric study for the newly discovered systems USNO-B1.0 1091-0130715 and GSC-03449-0680 were applied by means of recent windows interface version of the Wilson and Devinney code based on model atmospheres by Kurucz (1993). The accepted models reveal some absolute parameters for both systems, which used in adopting the spectral type of the systems components and follow their evolutionary status. Distances to each systems are and physical properties are estimated. Comparisons of the computed physical parameters with stellar models are discussed.

astro-ph.SR↗
arXiv2014

Modern Comprehensive study of the W UMa System TY Boo

New CCD three colors light curves of TY Boo were carried out in five nights from February to May 2006 in BVR bandpass using a 50-cm F/8.4 Ritchey Chretien telescope (Ba50) of the Baja Astronomical Observatory (Hungary), and 512*512 Apogee AP-7 CCD camera. A photometric solution of these light curves was obtained by means of Willson-Devinney code. The results showed that the low massive component is hotter than the more massive and cool one, and the temperature difference between the components is Delta T = 249 K. Long term investigation for the period behavior of the system based on all available data shows two stages of increase and similar of decrease, which look like as a periodic behavior. A new light elements yields a new period (p= 0.3171506 day) and shows a period decrease with the rate dP/dE = 5.858*10^(-12) day/cycle or 6.742*10^(-9) day/year or 0.1 second/century. The evolutionary status of the system is discussed.

astro-ph.SR↗
arXiv2014

Spectroscopic Analysis of the Double Lined Eclipsing Binary αVir

αVir is a well known double-lined spectroscopic binary with a B-type for both components. In the present paper we have analyzed a total of 90 spectra obtained through 1992-2000. Spectral analysis are based on two spectral lines H(alpha) and HeI 6678 belong to H(alpha) region. Radial velocity analysis have suggested low eccentric orbit (e=0.002) at inclination (i=81.89+-2.34) and with 4d.01422 period, semi-amplitude k1=100 km/s, mass ratio q=0.49+-0.05 and mass function f(m) =0.547. Using KOREL program for spectrum disentangling we have been able to decompose the spectrum of the system to its primary and secondary components. Synthetic spectral analysis of both the individual and disentangled spectra has been performed and yielded effective temperatures Teff= 25000+-250 K, surface gravities log g=3.75+-0.25 and projected rotational velocities (v sin i= 180+-5 km/s) for the primary, while for the secondary they are Teff = 17000+-250 K, log g = 4.0+-0.25.

astro-ph.SR↗
arXiv2010

Spectroscopic analysis of the B/Be visual binary HR 1847

We studied both components of a slightly overlooked visual binary HR 1847 spectroscopically to determine its basic physical and orbital parameters. Basic stellar parameters were determined by comparing synthetic spectra to the observed echelle spectra, which cover both the optical and near-IR regions. New observations of this system used the Ondřejov and Rozhen 2-m telescopes and their coudé spectrographs. Radial velocities from individual spectra were measured and then analysed with the code {\FOTEL} to determine orbital parameters. The spectroscopic orbit of HR 1847A is presented for the first time. It is a single-lined spectroscopic binary with a B-type primary, a period of 719.79 days, and a highly eccentric orbit with e=0.7. We confirmed that HR 1847B is a Be star. Its Hαemission significantly decreased from 2003 to 2008. Both components have a spectral type B7-8 and luminosity class IV-V.

astro-ph.SR↗