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AAVSO Newsletter 49 now online
AAVSO Newsletter 49, July 2011, is now online.
http://www.aavso.org/aavso-newsletter
Week of Online Chats for Beginners: July 25-29
We will be hosting three online chat sessions for beginners to the AAVSO during the week of July 25, 2011. Below are the list of the chat topics. However, feel free to bring up any topic at any chat.
The chat room can be accessed by pointing your browser here. Details about how to use dedicated chat clients are here.
Beginner Chat #1: Visual Observing
Monday, July 25 at 9pm eastern (-4UT)
Pro-Am White dwarf Monitoring (PAWM) Pilot Project
Bruce Gary has announced a one-month pilot project to evaluate the feasibility of observing exoplanet transits of white dwarfs. The advantage of looking at white dwarfs is that the eclipses will be deeper. The disadvantage is they will be very short (on the order of minutes). So there is considerable challenge here!
Alert Notice 443: Long-term monitoring of four AGN in support of ground-based spectroscopy
[Edited 2011 July 12 to indicate that the apertures and annuli are radii rather than diameters. -- M. Templeton, AAVSO]
Delta Scorpii: el nacimiento de una estrella Be
This is also available in English
Las estrellas Be
El estadio Be no es sólo una etapa evolutiva en las vidas de algunas estrellas calientes de tipo B de rápida rotación sino también un fenómeno transitorio que puede ir y venir con el paso de los años en la misma estrella. Varias razones se han propuesto para explicar el comportamiento de estas estrellas y aun están en debate.
Delta Scorpii: the birth of a Be star
The Be stars
Be-ness is not only an evolutionary stage in the lives of some rapidly rotating hot B-type stars but also a transient phenomenon that may come and go over the years for the same star. Several reasons have been proposed to explain the behavior of these stars and are still in debate.