Astrophysics update 2 by John Mason

By John Mason

«Astrophysics Updates» is meant to serve the data wishes astronomers and postgraduate scholars approximately components of astronomy, astrophysics and cosmology which are wealthy and lively examine spheres. Observational equipment and the most recent result of astronomical learn are offered in addition to their theoretical foundations and interrelations. The contributed commissioned articles are written through best exponents in a layout that might attract specialist astronomers and astrophysicists who're attracted to themes outdoor their very own particular components of study. This number of well timed reports can also allure the curiosity of complicated novice astronomers looking scientifically rigorous insurance.

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Astrophysics update 2

«Astrophysics Updates» is meant to serve the data wishes astronomers and postgraduate scholars approximately parts of astronomy, astrophysics and cosmology which are wealthy and lively study spheres. Observational equipment and the most recent result of astronomical learn are awarded in addition to their theoretical foundations and interrelations.

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Carbon monoxide is destroyed by conversion to CH4 + H2 O in gas parcels transported upward by convective mixing. The convective mixing time tmix is tmix ∼ H 2 /Keddy The H and Keddy in this equation are the pressure scale height and the vertical eddy diffusion coefficient. The pressure scale height is a function of atmospheric temperature, mean molecular weight (µ), and gravity H= RT µg The vertical eddy diffusion coefficient is estimated from the convective heat flux and is typically 107 –109 cm2 s−1 for the tropospheres of Jupiter and Saturn.

These clouds may be traceable by the strength of neutral monatomic Mg and Si lines, or in the case of Si, observations of band strengths of SiO, SiS and various Si hydrides (depending on Ptot ). , FeH, CrH, CO, H2 O) still present when the silicates form. The Mg I lines may be more prominent that Si I lines because Mg I is the dominant Mg gas whereas Si I gas is a minor fraction of all Si-bearing gases. Very weak Mg I lines can be seen in the J-band spectra of late M dwarfs and are probably present in L2 dwarfs (Mc03) but these weak lines are not useful for monitoring any systematic decrease of Mg through the L-sequence.

In order to escape a neutron star’s powerful gravitational field photons must give up some of their energy. The amount of energy lost, ∆E = E0 [(1 − 2GM/c2 R)−1/2 − 1] called the gravitational redshift, provides a direct measure of the mass to radius ratio, β = GM/c2 R, also called the compactness, of the neutron star. So, an observation of, for example, redshifted spectral lines from the surface of a neutron star would provide important information on its structure. However, a redshift measurement alone does not by itself allow a unique determination of both the mass and radius separately.

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