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Aprender Astronomía con 100 ejercicios prácticos by Jordi Lopesino

By Jordi Lopesino

¿Le atrae el cielo nocturno? ¿Le gustaría observarlo, an easy vista o con telescopio, pero no sabe por dónde empezar? Este es el libro de astronomía que estaba buscando. Cien temas diferentes, cien ejercicios prácticos para convertirse en un astrónomo experto. become aware of el cielo an easy vista, con prismáticos, con telescopios, con cámaras CCD? No habrá más secretos para usted. Aprenda a distinguir los planetas de las estrellas, a encontrar l. a. estrella Polar, cómo se apunta y enfoca un telescopio, que telescopio le conviene más, cómo fotografiar una galaxia. Un libro para los angeles gente que empieza a mirar el cielo, pero con el que puede hacer todo el recorrido. Aprenda paso a paso, empezando por lo más básico y acabando con l. a. construcción de un observatorio astronómico. Jordi Lopesino es astrónomo beginner y lleva más de veinte años practicando astronomía y escribiendo libros y artículos sobre el cielo. Tiene un observatorio en l. a. terraza de su casa y colabora activamente con el Minor Planet heart (MPC) y el Exoplanet Transit Database (ETD). Los capítulos de este libro están basados en su experiencia como observador astronómico. Jordi Lopesino es astrónomo novice y lleva más de veinte años practicando astronomía y escribiendo libros y artículos sobre el cielo. Tiene un observatorio en los angeles terraza de su casa y colabora activamente con el Minor Planet middle (MPC) y el Explanet Transit Database (ETD). Los capítulos de este libro están basados en su experiencia como observador astronómico.

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5 Luminosity Effects Luminosity effects are evident in the morphology of galaxies through surface brightness differences between giants and dwarfs and through the sophistication of structure such as spiral arms. Van den Bergh (1998) describes his classification system which takes luminosity effects into account using a set of luminosity classes that are analogous to those used for stars. The largest, most massive spirals have long and well-developed arms, while less massive spirals have less well-defined arms.

In the same manner as bars, a strong spiral often has dust lanes on the concave sides of the inner arms. This is shown for NGC 1566 in the upper right panels of > Fig. 1-25. Both bar and spiral dust lanes are face-on patterns. Another type of face-on pattern is the dust ring. The inner dust ring of NGC 7217 is shown in the right middle frames of > Fig. 1-25, and it appears as the dark, inner edge of a stellar ring having the same shape. Dust rings can also be detected in more inclined galaxies.

This is a type of spiral that is deficient in neutral atomic hydrogen gas, and, as a consequence, it has a lower amount of dust and star formation activity. The arms of NGC 4921 resemble those of an Sb or Sbc galaxy in pitch angle and extensiveness but are as smooth as those typically seen in Sa galaxies. Anemic spirals were first recognized as galaxies with “fuzzy” arms (see van den Bergh, 1998) where star formation has been suppressed due to ram-pressure stripping in the cluster environment. In the case of NGC 4921, the environment is the Coma Cluster.

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