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News and Announcements

01 September Visual Observing Manual - Portuguese Version

Thanks to the hard work and perseverance of David Duarte and his colleagues at the Centro de Estudos Astronômico de Alagoas (CEAAL), there is now a version of the AAVSO Manual for Visual Observing of Variable Stars available for download here:

http://www.aavso.org/visual-observing-manual-portuguese

We hope that this manual will be helpful to all of our many Portuguese-speaking observers and that you will feel free to share it with others.

30 August New eJAAVSO preprint: "Secular Variation of the Mode Amplitude-Ratio of the Double-Mode RR Lyrae Star NSVS 5222076, Part II, by D. Hurdis and T. Krajci

"Secular Variation of the Mode Amplitude-Ratio of the Double=Mode RR Lyrae Star NSVS 5222076, Part II, by D. Hurdis and T. Krajci

http://www.aavso.org/ejaavso

25 August Alert Notice 446: Supernova 2011‭fe ‬in M101‭ (‬NGC 5457‭) = ‬PSN J14030581+5416254

August 26‭, ‬2011

Discovered by‭:  ‬The Type Ia supernova science working group of the‭ ‬ Palomar Transient Factory‭:  ‬Peter Nugent‭, ‬Lawrence Berkeley National‭ ‬Laboratory‭ (‬LBL‭), ‬University of California at Berkeley‭; ‬Mark‭ ‬Sullivan‭, ‬Oxford University‭; ‬David Bersier‭, ‬Liverpool John Moores‭ ‬University‭ (‬LJMU‭); ‬D‭. ‬A‭. ‬Howell‭, ‬Las Cumbres Observatory Global‭ ‬Telescope Network Inc‭., ‬University of California at Santa Barbara‭; ‬Rollin Thomas‭, ‬LBL‭; ‬Phil James‭, ‬LJMU

24 August Special Notice #250: Possible Type-Ia Supernova in M101

P. Nugent et al. report in ATel #3581 that a possible Type-Ia supernova has been discovered by the Palomar Transient Factory shortly after eruption in the galaxy M101 and has been designated "PTF11kly".  The object is currently at a magnitude of g=17.2, but may well rise by several magnitudes. The object is well placed within M101 for good photometry, and observations of this potential bright SNIa are strongly encouraged.

The (J2000) coordinates reported for the object are

    RA: 14:03:05.81 , Dec: +54:16:25.4

24 August NSV 11154: A newly classified R CrB star

A paper by Nutsinee Kijbunchoo (LSU) and others on the star NSV 11154 has just been accepted for publication in the Publications of the Astronomical Society of the Pacific.  This paper "NSV 11154 is a New R Coronae Borealis Star" is now available on arXiv.org, and makes use of observations old and new. 

23 August Nuevo foro de AAVSO en idioma español

A partir de hoy, la AAVSO inaugura un espacio de intercambio para la comunidad hispanoparlante
donde intercambiar experiencias, preguntas, comentarios, información, observaciones y todo lo que tenga que ver con el estudio de las estrellas variables.

Foro de discusión de AAVSO en Español

19 August Special Notice #249: FTP site for submitting AGN images requested in Alert Notice 443

August 19, 2011: As announced in AAVSO Alert Notice 443, Dr. Misty Bentz (Georgia State University) requests observations of four active galactic nuclei (AGN) for a study of variability in these sources by the STARE Collaboration. She requests BVRcIc filtered photometry of NGC 6814, NGC 7213, NGC 7469, and NGC 1566 from July 10, 2011, to November 1, 2011. She also requests that observers submit their images for analysis. An FTP site has been created for this purpose.

19 August Alert Notice 445 - Request for monitoring of SS Cygni in support of European VLBI radio observations

August 19, 2011: Following their very successful multiwavelength observing campaign on the dwarf nova SS Cygni in 2010 April (see AAVSO Special Notices #204 and 206 and the related information page), Dr. James Miller-Jones (International Centre for Radio Astronomy Research, Curtin University, Perth, Western Australia) and colleagues have a follow-up multiwavelength campaign on SS Cyg scheduled.

17 August Buy the AAVSO Centennial History book directly from the AAVSO!

The AAVSO has 100 copies of Advancing Variable Star Astronomy that we are selling at the 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.

11 August Special Notice #248: Radio outburst in V1343 Aquilae

Radio outburst in V1343 Aquilae
August 11, 2011

Note: This text was updated from the original to include the most recent observation. -M. Templeton, 2011 August 11

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.

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