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News and Announcements

08 July 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]

08 July 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.

07 July 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.

07 July Charts and Sequences Update July 2011

 

06 July Variable Star iPhone App Now Free

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

05 July 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.

30 June AAVSO 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.

29 June Variable Star Astronomy TOC in Belorussian

Galina Miklosic has recently translated the table of contents for our Variable Star Astronomy curriculum to Belorussian. Thank you, Galina!

28 June 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

28 June 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.

24 June 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

15 June New Observing Section Created to study Young Stellar Objects (YSOs)

 Michael Poxon has taken it upon himself to head a new AAVSO section on his favorite class of variable star: Pre-Main Sequence Stars (YSO/PMS). The AAVSO has had a long history of working with such objects, especially the "Orion variables" that were monitored by many visual observers for years.

15 June New Logo Contest Deadline is Close

As part of the AAVSO's Centennial Celebrations we are holding a contest to design a new logo for the organization. This is just a quick reminder that the deadline for submission to the contest is July 1. As of this posting we have five submissions. Click here for more information on the logo contest and instructions on how to submit a design. 

14 June The Cepheid Variable M31_V1: Hubble's First Cepheid

08 June 20% Discount on New Centennial Book (updated)

July 21 Update: The books are here! The AAVSO has 100 copies of the book that we are selling at the same Cambridge Press discounted rate of $80. So please order from the AAVSO store and help support the organization. We have the books in stock for immediate shipment.

But wait, there's more! If you add an order for one of our limited edition Centennial T-Shirts, we will take $15 off your total order at checkout.

08 June JAAVSO vol. 39, nr. 1, is published

The Journal of the American Association of Variable Star Observers (JAAVSO), Volume 39, Number 1, 2011, is now available for downloading and for hardcopy purchase.


http://www.aavso.org/jaavso-v39n1

07 June AAVSO Eclipsing Binary Ephemeris for 2011 available

The 2011 AAVSO Eclipsing Binary Ephemeris, prepared by Gerry Samolyk, is now available online at

http://www.aavso.org/eclipsing-binary-ephemerides

Good observing!

07 June AAVSO Special Notice #243: Pre-SN 2011dh images of M51 requested

Pre-SN 2011dh images of M51 requested

06 June Margaret Mayall Assistantship Open for Applications for Summer 2011

(update: this position has been filled.)

03 June AAVSO Special Notice #242

SN 2011dh = Supernova in M51 = PSN J13303600+4706330


June 3, 2011: As an update to AAVSO Special Notice #241 (http://www.aavso.org/aavso-special-notice-241), the supernova in M51 has been designated SN 2011dh. Discovery, classification, and observation information have been published in IAU CBET 2736 (Daniel W. E. Green, ed.).

Coordinates: 13:30:05.08 +47:10:11.2  (J2000.0)

03 June Alert Notice 442: Nova Scorpii 2011 = PNV J16551100-3838120

June 3, 2011

Event: Nova Scorpii 2011 = PNV J16551100-3838120

Discovered by: John Seach, Chatsworth Island, NSW, Australia

Discovery Date: 2011 June 1.40 UT

Discovery Magnitude: magnitude 9.5 on three CCD images (limiting
mag 11.0) taken with a digital SLR camera (+ 50-mm f/1.2 lens
+ orange filter).  

Coordinates: R.A. = 16:55:11, Decl. = -38:38:12 (equinox 2000.0)

Spectra: Three sets of spectra have been reported:

03 June AAVSO Special Notice #241

New Supernova in M51

03 June Women in the Geosciences: Past, Present, and Future

The following announcement is made on behalf of long time AAVSO observer/member Dr. Kristine Larsen:

01 June April Solar Bulletin

The April Solar Bulletin has been posted.

01 June AAVSO Special Notice #240

Possible Nova in Scorpius

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