Influence of opal equation of state to interior structure and evolution of the sun

Durmus, A
Civelek, R
It was computed the interior structure and evolution of the Sun with the OPAL equation of state during the hydrogen burning phase. Theoretical evolution calculations of solar model, starting from threshold of stability point at which gravitational and internal energy are nearly the same, were carried out using Ezer equation of state through the gravitational contraction and premain sequence. Later, during hydrogen burning phase, solar model was constructed with OPAL equation of state which was defined in the temperature range 5000 <= T <= 10(8) K. We compared our solar model with recent models computed by other groups and with helioseismic results.


YILDIZ, M; ERYURTEZER, D (Springer Science and Business Media LLC, 1992-04-01)
Calculation of equation of state in stellar interiors becomes difficult as contained gas deviates from perfect gas. We present a method for the calculation of electron pressure in terms of density and temperature in the presence of degeneracy. The method is applicable for T < 10(9) K, and requires complete ionization.
DEFPOS and its first results
Sahan, M; Yegingil, I; Aksaker, N; Kiziloglu, U; Akyılmaz, M. Özdemir (IOP Publishing, 2005-04-01)
A spectrometer was built to examine the interstellar medium (ISM) using the hydrogen Balmer a line. It is called Dual Etalon Fabry-Perot Optical Spectrometer (DEFPOS). DEFPOS will be coupled to coude exit of the 150 cm telescope (RTT150) installed at TUBITAK National Observatory (TUG). DEFPOS was ready for observations about two years ago, but work was still continuing on the RTT150 coude exit alignment. So we have started observing HII regions with DEFPOS without the RTT150. We present here some characteri...
Very high energy gamma rays from the composite SNR G0.9+0.1
Aharonian, F; et. al. (EDP Sciences, 2005-03-01)
Very high energy (> 100 GeV) gamma-ray emission has been detected for the first time from the composite supernova remnant G0.9+ 0.1 using the HESS instrument. The source is detected with a significance of approximate to 13sigma, and a photon flux above 200 GeV of ( 5.7 +/- 0.7(stat) +/- 1.2(sys)) x 10(-12) cm(-2) s(-1), making it one of the weakest sources ever detected at TeV energies. The photon spectrum is compatible with a power law ( dN/dE proportional to E-Gamma) with photon index Gamma = 2.40 +/- 0.1...
A Suzaku X-ray study of the mixed-morphology supernova remnant Kes 69 and searching for its gamma-ray counterpart
Sezer, A.; Ergin, Tülün; Yamazaki, R.; Ohira, Y.; Cesur, N. (Oxford University Press (OUP), 2018-11-01)
Kes 69 is a mixed-morphology (MM) supernova remnant (SNR) that is known to be interacting with molecular clouds based on 1720 MHz hydroxyl (OH) maser emission observations in the northeastern and southeastern regions. We present an investigation of Kes 69 using similar to 67 ks Suzaku observation. The X-ray spectrum of the whole SNR is well fitted by a non-equilibrium ionization model with an electron temperature of kT(e) similar to 2.5 keV, ionization time-scale of tau similar to 4.1 x 10(10) cm(-3) s and ...
Modeling of the expansion of ultra-short-pulse laser-produced plasmas in magnetic fields
Ditmire, T; Rubenchik, A; Mirnov, VV; Ucer, D (American Astronomical Society, 2000-04-01)
The study of hot plasma expansion in a uniform magnetic field is of interest for many astrophysical applications. In order to observe this process in laboratory, an experiment is proposed in which an ultrashort laser pulse produces a high-temperature plasma by irradiation of a jet of atomic clusters. The very high laser light absorption exhibited in such a gas of clusters facilitates the creation of a hot (> 5 keV), dense (10(19)-10(20) cm(-3)) plasma with a sharp boundary. The small scale of the plasma ( 1...
Citation Formats
A. Durmus and R. Civelek, “Influence of opal equation of state to interior structure and evolution of the sun,” INTERNATIONAL JOURNAL OF MODERN PHYSICS D, pp. 323–334, 2005, Accessed: 00, 2020. [Online]. Available: