An Introduction to Astronomy and Astrophysics by Pankaj Jain

By Pankaj Jain

Astronomy is the sphere of technology dedicated to the research of astronomical items, similar to stars, galaxies, and nebulae. Astronomers have amassed a wealth of data concerning the universe via 1000s of years of painstaking observations. those observations are interpreted by means of actual and chemical legislation widespread to mankind. those interpretations provide information regarding the character of those astronomical items, bearing in mind the deduction in their floor and inside stipulations. The technology linked to those interpretations is termed astrophysics.

An advent to Astronomy and Astrophysics

offers a complete advent to astronomy and astrophysics, whole with illustrative examples and illuminating homework difficulties. Requiring a familiarity with simple physics and arithmetic, this undergraduate-level textbook:

  • Addresses key physics recommendations proper to stellar observations, together with radiation, electromagnetic spectrum, photometry, non-stop and discrete spectrum, and spectral lines
  • Describes tools used for astronomical observations in addition to how the radiation bought is characterised and interpreted to figure out the houses of stars
  • Examines the constitution of stars, the elemental equations which clarify stars in equilibrium, and the fusion reactions taking place in stellar cores
  • Discusses the evolution of stars, the sunlight procedure, the dynamics of galaxies, and the basics of contemporary cosmology
  • Explores the universe at excessive redshifts, the place it's ruled by means of items equivalent to lively galaxies

Solutions handbook and determine slides to be had with qualifying path adoption

An advent to Astronomy and Astrophysics

teaches scholars how you can interpret the evening sky, delivering them with a severe knowing of the celebrities and different heavenly bodies.

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Example text

The refractive index also depends on the frequency of light. If the incident light is a mixture or superposition of several different frequencies, these different components bend by different amounts. The refractive index in most materials increases with frequency. Hence a light beam of violet color undergoes larger refraction in comparison to red color. 6: A beam of light is incident at an angle θ1 with respect to the normal (dashed line) to the surface. As it propagates from medium 1 to 2, it bends, such that in medium 2 it makes an angle θ2 to the normal.

1 Refractor Telescope . . . . . . . . . . . . . . . . . . . 2 Reflecting Telescope . . . . . . . . . . . . . . . . . . . Observations at Visible Frequencies . . . . . . . . . . . . . . . 1 Theoretical Limit on Resolution . . . . . . . . . . . . 2 Seeing . . . . . . . . . . . . . . . . . . . . . . . . . . Mounting of Telescope . . . .

Hence the equatorial frame changes slowly and one has to specify the time or epoch in which the system is used. The system is updated every 50 years. Before 2000, the system B1950 was in use. Now the system J2000 is being used. 4). The ecliptic pole is the point where a line perpendicular to the ecliptic at the origin meets the celestial sphere. The origin may be chosen to be the position of the Earth or the Sun. The equatorial and ecliptic planes intersect along a straight line directed toward the vernal equinox, which is the reference direction for the definition of RA, the azimuthal coordinate in the equatorial system.

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