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News and Announcements

01 June Through a Picket Fence - Overview of aliasing in data analysis

 

Grant Foster has written a new blog post titled "Through a Picket Fence". It describes the effect of aliasing when analyzing variable star data. It's written at an introductory level appropriate for those new to data analysis, but with brief references to the math more advanced people may find interesting. The post is at the URL below.

http://tamino.wordpress.com/2012/05/31/through-a-picket-fence/

01 June New eJAAVSO preprint: "Miras"

(ej193): "Miras" by L. A. Willson and M. Marengo

www.aavso.org/ejaavso

31 May Special Notice #285: Outburst of old nova X Ser

31 May 2012: As announced by Robert Modic (Richmond Heights, OH) 2012 May 30 in the aavso-photometry discussion group (http://www.aavso.org/pipermail/aavso-photometry/) and subsequently reported in vsnet-alert 14629, the old slow nova X Ser (Nova Ser 1903) is in outburst. This outburst is likely a dwarf nova-like outburst, similar to the one seen in 2009, which was the first reported since the nova outburst in 1903.

31 May New eJAAVSO preprint: Type 2 Cepheids in the Milky Way Galaxy and the Magellanic Clouds

(ej192): "Type 2 Cepheids in the Milky Way Galaxy and the Magellanic Clouds" by D. L. Welch

www.aavso.org/ejaavso

29 May Solar Bulletin - Volume 68, Number 4

The April 2012 Solar Bulletin is now available.

26 May Special Notice #284 - NOVA OPHIUCHI 2012 No. 2 = PNV J17395600-2447420

26 May 2012IAU CBET 3124 (Daniel W. E. Green, ed.) announces the discovery by John Seach (Chatsworth Island, NSW, Australia) of a nova in Ophiuchus on 2012 May 19.484 UT at magnitude 10.5 (digital SLR camera + 50-mm f/1.0 lens). Seach reports nothing is visible at this position on the Digitized Sky Survey. The object was designated PNV J17395600-2447420 when it was posted on the Central Bureau's TOCP webpage (http://www.cbat.eps.harvard.edu/unconf/tocp.html).

25 May Two new eJAAVSO preprints: on RR Lyr stars and on Digital Archiving

(ej191): "Digital Archiving: Where the Past Lives Again" by K. B. Paxson

(ej190): "RR Lyrae Stars: Cosmic Lighthouses With a Twist" by K. Kolenberg

www.aavso.org/ejaavso

24 May 2012 Spring Director's Report Now Online!

The 2012 Spring Director's Report presented during the AAVSO Meeting held in Big Bear, CA, was recorded and is now online to download and view.

Please click here to download the video. When unzipped it is an .wmv file which, with appropriate software, will be viewable on Windows, Macintosh, and Linux systems.

24 May Two new eJAAVSO preprints: on symbiotic stars and on RS Gru

(ej189): "Symbiotic Stars" by U. Munari

(ej188): "The Pulsational Behavior of the High Amplitude d Scuti Star RS Gruis" by J. R. García

www.aavso.org/ejaavso

23 May Special Notice #283: Supernova 2012cg IN NGC 4424 = PSN J12271283+0925132

May 23, 2012: IAU Central Bureau Electronic Telegram 3111 (Daniel W. E. Green, ed.) announces the LOSS discovery (reported by M. Kandrashoff, S. B. Cenko, W. Li, and A. V. Filippenko) of a supernova in NGC 4424 on 2012 May 17.22 at unfiltered magnitude 16.9.

Spectra indicating the object to be a Type Ia supernova discovered about two weeks before maximum were obtained by:

22 May Spring 2012 Director's Report to be broadcast online!

Join us on Wednesday, May 23rd at approximately 7:15pm Pacific/10:15pm Eastern/2:15 UT for Arne Henden's Director's Report.  On the heels of the very successful "Astro-April" series of webinar broadcasts for the Citizen Sky celebration and as part of the Spring 2012 Meeting being held jointly with SAS in Big Bear, California we are using GoToWebinar to broadcast Arne's talk.

Click here any time between now and the talk to register for the broadcast. (Mac or Windows)

21 May Special Notice #282: Apparent fading of V854 Cen

May 21, 2012: The R CrB star V854 Cen appears to be fading from maximum, according to recent observations reported to the AAVSO:

2012 May 17.1313 UT, 7.2 (B. Cudnik, Houston, TX);
17.380, 7.4 (P. Williams, Heathcote, NSW, Australia);
17.5069, 7.3 (D. Leys, Warrimoo, NSW, Australia);
17.5181, 7.4 (A. Plummer, Linden, NSW, Australia);
18.2125, 7.4 (Cudnik);
18.4917, 7.4 (Plummer);
19.1458, 7.5 (Cudnik);
19.3264, 7.35 (M. Linnolt, Ocean View, HI);

21 May New eJAAVSO preprint: Observations of Cataclysmic, RR Lyr, and High Amplitude d Scuti (HADS) Variable Stars

(ej187): "Intensive Observations of Cataclysmic, RR Lyr, and High Amplitude d Scuti (HADS) Variable Stars" by F. Hambsch

www.aavso.org/ejaavso

15 May New eJAAVSO preprint: Adverse Health Effects of Nighttime Lighting

(ej186): "Adverse Health Effects of Nighttime Lighting" by M. Motta

www.aavso.org/ejaavso

15 May Special Notice #281: Revised timetable for AE Aqr MAGIC observations

15 May 2012: Dr. Christopher Mauche, Lawrence Livermore National Laboratory, has informed us that the timetable of MAGIC telescope  observations of the intermediate polar cataclysmic variable AE Aqr announced in AAVSO Alert Notice 458 has been revised. Here is the revised timetable for the dates in May and early June:

2012 May
16, 3:30 - 4:49 UT
17, 3:21 - 4:49
18, 3:17 - 4:49
19, 3:13 - 4:47
20, 3:09 - 3:53
21, 3:06 - 3:49

14 May New eJAAVSO preprint: on RASNZ-VSS and Variable Stars South

(ej185): "The RASNZ Variable Star Section and Variable Stars South" by A. Jones and S. Walker

www.aavso.org/ejaavso

11 May Two new eJAAVSO preprints: on Clint Ford; on BAA-VSS history

(ej183): "An Appreciation of Clinton B. Ford and the AAVSO of Fifty Years Ago" by T. Hull

(ej184): "British Astronomical Association Variable Star Section, 1890–2011" by J. Toone

www.aavso.org/ejaavso

11 May Alert Notice 458: Multiwavelength observing campaign on AE Aqr

NOTE: Table of MAGIC observations revised 14 and 15 May 2012 per Dr. Christopher Mauche.

10 May New eJAAVSO preprint: On the usefulness of Type Ia Supernovae

(ej182): "The Usefulness of Type Ia Supernovae for Cosmology—A Personal Review" by K. Krisciunas

www.aavso.org/ejaavso

10 May New eJAAVSO preprint: on Frank Elmore Ross

(ej181): "Frank Elmore Ross and His Variable Star Discoveries" by W. Osborn

www.aavso.org/ejaavso

10 May New eJAAVSO preprint: Progress Report for Adapting APASS Data Releases for the Calibration of Harvard Plates

(ej180): "Progress Report for Adapting APASS Data Releases for the Calibration of Harvard Plates" by E. Los

www.aavso.org/ejaavso

09 May New eJAAVSO preprint: The Visual Era of the AAVSO EB Program

(ej179): "The Visual Era of the AAVSO Eclipsing Binary Program" by D. B. Williams, M. E. Baldwin, G. Samolyk

www.aavso.org/ejaavso

09 May Special Notice #280: HST UV spectroscopy observations of S Dor scheduled

May 9, 2012: We have been informed by Dr. Noel Richardson, Georgia State University, that the UV spectroscopy observations of S Dor to be made with the Hubble Space Telescope have been scheduled for

2012 MAY 11 from 21:21:55 UT to 23:55:04 UT.

08 May Special Notice #279: Request for monitoring of SS Cygni in support of European VLBI radio observations

7 May 2012:  As mentioned in AAVSO Alert Notice 445 in August 2011 and AAVSO Special Notice #258 in October 2011, Dr.

04 May New eJAAVSO preprint: The “Werkgroep Veranderlijke Sterren” of Belgium

(ej178): "The “Werkgroep Veranderlijke Sterren” of Belgium" by P. Wils, E. Broens, H. Hautecler, F. Van Loo

www.aavso.org/ejaavso

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