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News and Announcements

17 November Charts and Sequences Update November 2011

 Dear AAVSO Observers,

09 November Please Take Our Demographic Survey

We are conducting a survey to learn more about the demographics of our members, observers and anyone affiliated with or interested in the AAVSO. Information may be used for purposes such as making strategic plans for the AAVSO, writing grant applications, planning observing campaigns, writing papers about our membership, etc.

Identifiable survey data will never be shared with anyone outside of the AAVSO.

07 November ArXiv Preprint: Multiwavelength Campaign of Observations of AE Aqr

Longtime friend of the AAVSO, Dr. Chris Mauche (Lawrence Livermore National Lab), has published a paper about AE Aqr in which he uses data from AAVSO observations. It was submitted for inclusion in the proceedings of the conference "The Golden Age of CVs and Related Objects".

The ArXiv link to the black/white paper is here.

But you can download the color paper directly here.

The abstract:

04 November New eJAAVSO preprint: Periodicity Analysis of the Semiregular Variable Star EV Aquarii, by E. Terziev, J. R. Percy, A. A. Henden

ej152: Periodicity Analysis of the Semiregular Variable Star
EV Aquarii

http://www.aavso.org/ejaavso

02 November Special Notice #262: Long-term monitoring of AGN targets extended

November 2, 2011:  The observing campaign described in AAVSO Alert Notice 443 (M. Templeton) has been extended through the end of November 2011. One of the original targets, NGC 6814, has been removed from the target list for the remainder of the campaign.

02 November Modern observations of Hubble's first-discovered Cepheid in M31

The paper "Modern observations of Hubble's first-discovered Cepheid in M31" has been accepted for publication to PASP, and is now available on arXiv.org.

28 October AAVSO Newsletter 50 now online

AAVSO Newsletter 50, October 2011, is now online.

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

25 October Alert Notice 450: Request for observations of SDSS J080434.20+510349.2‭ ‬in support of HST observations

October 25‭, ‬2011: Dr‭. ‬Paula Szkody‭ (‬University of Washington‭) ‬has requested the help‭ ‬of AAVSO observers in monitoring the WZ Sge-type cataclysmic‭ ‬variable SDSS J080434.20+510349.2 (SDSS0804+51)‭ ‬in support of Hubble Space Telescope ultraviolet‭ ‬spectroscopic observations scheduled for 20:52:40‭ - ‬23:32:35‭ ‬2011‭ ‬November 3‭ ‬UT‭ (‬the night of Wednesday‭, ‬November 2/3‭)‬ ‭(‬JD 2455869.36991-‭.‬48096‭). ‬Nightly observations are requested‭ ‬beginning immediately and continuing through November 30‭.

25 October Alert Notice 449: Outburst of the UGWZ Candidate BW Scl

October 25, 2011

Event: Outburst of the UGWZ Candidate BW Scl

24 October Reminder: Observing Challenges End Soon!

There are only two months left to get a certificate for achieving one of our centennial observing challenges!

21 October Special Notice #261: Outburst of the UGWZ Candidate BW Scl

The short period cataclysmic variable BW Scl appears to be in outburst. The object was detected in outburst at m(vis)=9.6 by M. Linnolt on 2011 October 21.3146 (JD 2455855.8146), and confirmed by A. Plummer at m(vis)=9.4 on October 21.3424.  Observations of this object are encouraged.  The object has conflicting classifications in astronomical literature, but is probably a WZ Sge-type dwarf nova rather than a novalike variable.

BW Scl is located at the following (J2000) coordinates:

19 October AAVSO 100th Anniversary Commemorative Posters

By popular demand! A set of twenty pdf commemorative posters exhibited at AAVSO Headquarters is available for downloading from our ftp site.

The posters show portraits of the AAVSO's Directors, Presidents, Secretaries, Treasurers, Council members, and Staff from 1911 to 2011, and the top Visual, CCD, PEP, and Photographic/Photovisual observers.

Click on the links below to download each poster.

19 October Deep light curve of GRB 110918A

18 October Sky & Telescope to Celebrate Seventy Years!

It's not only the AAVSO that is celebrating milestones this month. Our close personal friends, Sky & Telescope magazine is celebrating its 70th Anniversary in its own style.

18 October Group Photo from the AAVSO's 100th Anniversary Meeting

Click on this link for a downloadable high-resolution group photo (1.7MB)

Click on this link for a downloadable KEY to the photo (877kb pdf)

      Downloadable key includes list of those who attended but were not present for the photo

09 October New HQ Officially Dedicated

The AAVSO's new headquarters was officially dedicated at a ceremony during the 100th Annual Meeting of the AAVSO, part of our 2011 centennial celebrations.

The event was broadcast live on U-Stream. A video archive is still available on their servers.

Sky & Telescope has a nice news article covering the dedication and events surrounding it.

29 September Charts and Sequences Update September 2011

The following stars (objects) have new or revised sequences as of September 29, 2011.

Please update your charts if you observe any of these objects.

 

26 September New eJAAVSO preprint: Recent Minima of 146 EB Stars by G. Samolyk

ej151: "Recent Minima of 146 Eclipsing Binary Stars" by G. Samolyk

http://www.aavso.org/ejaavso

23 September Astronomy Now Interview w/Williams and Saladyga

Astronomy Now has posted an interesting dialog with the authors of  Advancing Variable Star Astronomy: Tom Williams and Michael Saladyga.

22 September Special Notice 257: Reminder to observe V455 And for HST observations

September 22, 2011: As detailed in AAVSO Alert Notice 448, Dr. Paula Szkody has requested monitoring of the WZ Sge-type cataclysmic variable V455 And through October 10. Observations tonight - September 22/23, tomorrow, and Saturday are crucial.

16 September Request to Take Astronomy Knowledge Survey

Dear AAVSO Members and Observers,

Dr. Stephanie Slater (Center for Astronomy & Physics Education Research [CAPER] and Capitol College) has requested that active AAVSO members and observers take a survey about basic astronomy knowledge at the following URL:

http://www.surveymonkey.com/s/2YYX9JQ

16 September Special Notice #256: Request for fast optical time series of SN 2011fe

September 16, 2011: Dr. Bradley Schaefer (LSU) requests fast time series of SN 2011fe over the next several weeks to attempt the detection of fast optical variations in supernova light.

The following request was prepared by Dr. Schaefer which we forward at his request:

14 September Special Notice 255: Cataclysmic Variable in Draco = PNV J18422792+4837425

September 14, 2011: IAU CBAT Central Bureau Electronic Telegram 2818 (Daniel W. E. Green, ed.) announces the discovery by Hideo Nishimura, Miyawaki, Kakegawa, Shizuoka-ken, Japan, of a cataclysmic variable in Draco on 2011 Sept. 5.529 UT at magnitude 11.8 (reported by S. Nakano, Sumoto, Japan). The variable was designated PNV J18422792+4837425 when posted on the Central Bureau's TOCP webpage.

14 September Three new eJAAVSO preprints

ej148: "Deep Infrared ZAMS FIts to Benchmark Open Clusters Hosting delta Scuti Stars" by D. J. Majaess, D. G. TUrner, D. J. Lane, T. Krajci

ej149: "Delta Scuti Behavior Detected in HD 349422" by G. Turner, R. Kaitchuck

ej150: "A Search for Eclipsing Binary Light Curve Variations Among MACHO Project Light Curves of 3,256 Fundamental-Mode RR Lyrae Variables in the Galactic Bulge" by M. W. Richmond

 

http://www.aavso.org/ejaavso

14 September Supernova Photometry Chat with Dr. Michael Richmond

On 13 September, 2011, we had the good fortune to have Dr. Michael Richmond, Physics Professor and Observatory Director for the Rochester Institute of Technology in New York chat with us about SN 2011fe and supernova photometry in general. Here is the transcript from that chat session.

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