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:
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
|25 August||Alert Notice 446: Supernova 2011fe in M101 (NGC 5457) = PSN J14030581+5416254||
August 26, 2011
|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.
|22 August||Nuevo foro de AAVSO en idioma español||
A partir de hoy, la AAVSO inaugura un espacio de intercambio para la comunidad hispanoparlante
|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
|09 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
|08 August||Special Notice #247: Possible Nova in Lupus||
Possible Nova in Lupus
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.
|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)||
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.
|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.
|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
|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!
|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||
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.