2005: Past Meets Present in Astronomy And Astrophysics: by Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho PDF

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By Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho

ISBN-10: 9812568875

ISBN-13: 9789812568878

ISBN-10: 9812773061

ISBN-13: 9789812773067

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Extra info for 2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting

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The pulsation frequencies expected for each model were computed using the code of linear adiabatic acoustic pulsations described at Ref. [4]. The large and small frequency separations used to compute the CD diagram were selected taking into account the highest amplitude oscillations expected for PMS stars. The maximum power pulsations were estimated using the predictions given at Ref. [2]. A normalised version of the small separation 7 was used to compute the CD diagram that is displayed on the lower panel of Figure 1.

For several years we have been conducting a systematic UBVRI photometric survey of open clusters in this part of the Galaxy 6 - 9 to study the 43 44 structure of the Disc. In particular, young open clusters are privileged spiral tracers since their distances can be better determined than those of individual stars and their youth keeps them close to the spiral arms where they were born. In this contribution we report the detection of a distant young stellar population and discuss how this result casts considerable doubt on the interpretation of the CMa over-density as the core of an external galaxy.

Santos, N. et al. , A&A 426L, 19S (2004) 18. Sato, B. et al. , ApJ 633, 465S (2005) 19. fr/planetes 20. Udalski, A. et al. , Acta. Astron. 52, 115 (2002) PROBING THE STRUCTURE A N D ATMOSPHERES OF EXTRA-SOLAR PLANETS N. C. pt In this paper we review the recent results concerning the detection of extra-solar planets, with particular emphasis on the cases where a transit event is measured. 1. I n t r o d u c t i o n From 1995 to the present, following the discovery of the first extra-solar planet orbiting a solar type star 1 6 , about 160 giant planets have been announced, showing t h a t these are common around stars in the solar neighborhood 3 '.

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2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting by Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho


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