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Delta Scorpii: el nacimiento de una estrella Be

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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

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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.

Variable Star iPhone App Now Free

The Variables Stars and AstroClock iPhone apps are now available for free. Thanks, Diatom software!

Arne Henden Receives Leslier C. Peltier Award

Arne Henden received the Leslier C. Peltier Award from the Astronomical League last weekend at their annual meeting in Utah. Click here for Sky & Telescope's coverage of the meeting.

Arne joins fellow AAVSO staffer Elizabeth Waagen and current member/observer Gerry Samolyk as past winners.

Special Notice #244: Continued close monitoring of T Pyx requested

Continued close monitoring of T Pyx requested

June 30, 2011: Since its outburst on 2011 April 14 (see AAVSO Alert Notice 436), the recurrent nova T Pyx has been very well monitored by visual and instrumental observers who can reach -32o. Thank you! Currently T Pyx is visual/V magnitude ~8.3.

New eJAAVSO: Light Curve of the Eccentric Eclipsing Binary GSC 3152-1202, by R. K. Buchheim

Abstract

A complete light curve of this eccentric (~2.094d) eclipsing binary system has been determined, in B, V, and R bands. The primary and secondary minima are slightly different in depth, and the color index does not change during either primary or secondary eclipse. Newly-determined times of minimum confirm the previously-suspected rapid change in the orbital phase of the secondary minimum, implying significant apsidal motion.

http://www.aavso.org/ejaavso

Minor VSP upgrades

Hi, all. Today we rolled out some relatively minor upgrades to VSP. There is nothing groundbreaking here. It's mostly minor tweaks and bug fixes. But I'm outlining them here for your information:

Additions
 - There is a new "reset all" button that will reset all fields in the user interface to their default values.
 - The variable star designator (cross hairs at the center of the chart) now appears on all charts, regardless of the limiting magnitude.

New eJAAVSO: The Ross Variable Stars Revisited. I. by W. Osborn, O. F. Mills

Abstract

Better magnitudes and epochs have been determined for 189 of the 379 confirmed and suspected variable stars discovered by Ross from 1925 to 1931. Accurate positions have been determined for those objects for which unambiguous identifications had been lacking.

http://www.aavso.org/ejaavso

Pages

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