Download PDF by Afonso J.: Past Meets Present in Astronomy And Astrophysics

By Afonso J.

ISBN-10: 9812568875

ISBN-13: 9789812568878

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E. supergiants). We then conclude that star formation is predominantly taking place in the outskirts of the cluster. And, in a general way, field galaxies in this line of sight reveal less evolved stellar populations. e. old and intermediate age stars are more abundant in the centre of the cluster than in the outskirts, whereas young stars dominate the stellar population as we approach the periphery of the cluster. Regarding field galaxies in this area, we find less evolved stellar populations than the ones obtained for members in the cluster centre.

Ch/exoplanets 39 40 = °- 4 s'"'P - {V" ! 6 (MJ„P) Figure 1. Mass-radius diagram for the giant planet companions for which a transit event has been detected. The position of Jupiter and Saturn, the two giant gaseous planets in the Solar System, is also marked (open squares). 4 and 1 . 0 g e m - 3 are shown for comparison. light dimming of the star as its planet crossed the stellar disk. The realm of data coming from these discoveries is opening, for the first time, the possibility of probing the planetary atmospheres and internal structure.

For the later case notice the field lines bending towards the equator. The field opens up at r=3R«. 4. Discussion and conclusions We show that very different surface flux distributions give rise to similar coronal fields. For surface fields concentrated near the poles, the field lines that emerge at high latitudes are driven towards low latitudes. Physically, this is simply a consequence of the very large magnetic pressure difference between high and low latitudes. Therefore, a strong field near the pole and a weak field near the equator at the stellar surface do not imply a strong field near the pole and a weak field near the equator in the corona.

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Past Meets Present in Astronomy And Astrophysics by Afonso J.

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