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News and Announcements

10 August JAAVSO Call for Papers for Special epsilon Aurigae Issue

CALL FOR PAPERS

for a special edition of the

Journal of the American Association of Variable Star Observers

dedicated to epsilon Aurigae, similar objects and amateur observing techniques of bright stars.

09 August Alert Notice 444: Nova Lupi 2011

August 9, 2011

Event: Nova in Lupus  -  Nova Lupi 2011   =  PNV J14542000-5505030

08 August Special Notice #247: Possible Nova in Lupus

Possible Nova in Lupus
August 7, 2011

Nick Brown in vsnet-alert 13560 posts about a possible new nova from his photographic survey:


"The star appears at mag 10.2 photographic, on 2 films taken on August 4.73UT using a 135F2 cannon lens and tmax 400 film.unfiltered. No object is present on film taken on july 5.85UT down to 11.7pg. No previous variable stars are reported at this near position."

The coordinates are: 14 54 20  -55 05 03  J2000

06 August Special Notice #246: Continued Monitoring of epsilon Aurigae

August 8, 2011: The bright star epsilon Aurigae has emerged from its most recent eclipse that began in August, 2009. A BVRIJH light curve for the last 365 days of the eclipse can be viewed at the following URL.

http://tinyurl.com/epsaur

04 August Eclipses During the 2010 Eruption of the Recurrent Nova U Scorpii

28 July Effects of dust on light-curves of ε Aur type stars (updated)

100728 Update: Dr. Budaj has offered a short description of the paper with a nice illustration, which can be read via the Citizen Sky forums.

The following is an abstract for a paper recently been posted to ArXiv (and accepted for publication in A&A Letters). The paper is based on your AAVSO observations of apsilon Aurigae and acknowledges AAVSO support.

Click here to read the paper.

25 July New Online Forum: Getting Started with the AAVSO
21 July Visual Estimate Experiment

19 July AAVSO Newsletter 49 now online

AAVSO Newsletter 49, July 2011, is now online.

http://www.aavso.org/aavso-newsletter

19 July 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.

19 July AAVSO 100th Annual Meeting

October 4-8, 2011

Cambridge & Woburn, MA

Click here for Group Photo!

19 July 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!

Click here for his web page describing the project.

11 July The Chart Error Reporting Tool (CHET) is back online
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

También disponible en español

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 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.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484