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News and Announcements

24 November New eJAAVSO preprint: Pulsating star period-amplitude relation

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eJAAVSO

Does the Period of a Pulsating Star Depend on its Amplitude?

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John R. Percy
Jeong Yeon Yook

Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada

21 November New eJAAVSO preprint: V1073 Herculis and the Possible Detection of a Dwarf Companion

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First Photometric Study of the Short Period Solar Type Binary V1073 Herculis and the Possible Detection of a Dwarf Companion

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Ronald G. Samec
Faculty Research Associate, Pisgah Astronomical Research Institute, One Pari Drive, Rosman, NC 28772

19 November Solar Bulletin - Volume 70, Number 10

The October 2014 Solar Bulletin is now available.
 
Please visit the Solar Bulletin web page to download your copy: 

​http://www.aavso.org/solar-bulletin

 

19 November Three new eJAAVSO preprints

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Long-term Secular Changes in the Period of Mira Stars

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Thomas Karlsson

Almers väg 19, 432 51 Varberg, Sweden

Received June 3, 2014; revised October 8, 2014; accepted October 24, 2014

Abstract

17 November New eJAAVSO preprint: observing zeta Aur binary stars

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eJAAVSO

The Challenge of Observing the zeta Aurigae Binary Stars

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Frank J. Melillo


Holtsville Observatory, 14 Glen-Hollow Dr, E-16, Holtsville, NY 11742

Received March 31, 2014; revised May 12, 2014 and June 12, 2014; accepted June 12, 2014

10 November Special Notice #390: New possible WZ Sge variable ASASSN-14jv

November 10, 2014: Astronomer's Telegram (ATel) #6676 (B.J. Shappee et al. 2014) notes the discovery of ASASSN-14jv, a bright optical transient found at V=11.3 on 2014 November 9.19 (JD 2456970.69). This object is suspected to be a cataclysmic variable of the WZ Sge subtype. Shappee et al. note that the source is less than one arcsecond away from a g=19.1 magnitude source in the Kepler Input Catalog, suggesting a large amplitude typical of UGWZ stars.

03 November The AAVSO Director search results are in!

Hello Members, Observers, Colleagues, and Friends,

As you may know, Dr. Arne A. Henden is retiring as Director of the AAVSO at the end of January 2015 after ten years of devoted service to the Association.

29 October Special Notice #389: Possible Supernova in NGC 4303 (M61) - PSN J12215757+0428185

October 29, 2014: The CBAT Transient Object Confirmation Page (follow-up page = http://www.cbat.eps.harvard.edu/unconf/followups/J12215757+0428185.html) reports the discovery of a possible supernova in M61 (NGC 4303) by Koichi Itagaki (Yamagata, Japan) on 2014 Oct. 29.8376 UT at magnitude 13.6 CCD unfiltered.

Coordinates:  R.A. 12 21 57.57   Dec. +04 28 18.5   (2000.0)

24 October Alert Notice 505: Monitoring of Northern dwarf novae for radio jets campaign

October 24, 2014: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several dwarf novae in support of their campaign to observe them in outburst with the Very Large Array (VLA) to search for radio jets.

24 October Silicon and Glass

Everyone’s familiar with the term ‘bricks and mortar’. Many donors prefer to give to specific projects or programs that result in well-defined, tangible goods, such as the new wing of a building, a playground, or furniture and athletic equipment for a recreation center.

24 October Special Notice #388: Outburst of VSX J213806.5+261957

October 23, 2014: Carey Chiselbrook (Georgia, United States; AAVSO observer code CCY) observed the WZ Sge-type dwarf nova VSX J213806.5+261957 in outburst at a visual magnitude of 9.7 on 2014 October 22.0590 (JD 2456952.55903). Prior to the outburst detection,  the last observation (also by CCY) indicated the star was not in outburst less than 24 hours prior (mvis < 13.8 at JD 2456951.6326).

22 October Charts and Sequences Update October 22, 2014

The following objects have had new or revised sequences added since the end of May. Please be sure you are using the most up to date charts and sequences if you observe any of these objects.

A complete listing of new and revised sequences for 2014 is available here.

20 October Solar Bulletin - Volume 70, Number 09
The September 2014 Solar Bulletin is now available. 
Please visit the Solar Bulletinweb page to download your copy: 
http://www.aavso.org/solar-bulletin
15 October AAVSO Newsletter for October 2014 is published

AAVSO Newsletter 62, October 2014 is now available to members

The AAVSO Newsletter is a periodic, general forum that supports our various observing programs with lists of new targets, observing programming ideas, and general information that spans a wide area of interest. Guest writers contribute pieces that can range from current events to book reviews.

29 September New eJAAVSO preprint: Amplitude variations in pulsating yellow supergiants

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Amplitude Variations in Pulsating Yellow Supergiants

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John R. Percy
Rufina Y. H. Kim

Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada

Received June 12, 2014; revised July 24, 2014; accepted July 24, 2014

Abstract

17 September Alert Notice 504: Epsilon Aur monitoring during predicted pulsation phase

September 17, 2014: Dr. Robert Stencel (University of Denver Astronomy Program) has requested that AAVSO observers monitor epsilon Aurigae from now through the end of the observing season.

12 September New eJAAVSO preprint: CT Lac--Long-period Carbon Star with Long-Timescale Variations?

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CT Lacertae: Another Long-period Carbon Star with Long-Timescale Variations?

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Matthew R. Templeton
Peter Maurer
Wolfgang Kriebel
Wayne M. Lowder (1932–2003)
Etienne Morelle
Steve O’Connor
Andrzej Arminski
Laurent Bichon
John E. Bortle

AAVSO, 49 Bay State Road, Cambridge, MA 02138

11 September Announcing the 2014 AAVSO Council Nominees

Please click on the name of the nominee to view his/her online biography.  Council election ballots were mailed to each member in mid-September.  Best of luck to all of our nominees!

05 September Two new eJAAVSO preprints: O-C Methods; EQ Eri

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Methods for O–C (Observed Minus Computed) Diagrams and for the Determination of Light Elements of Variable Stars with Linear and Second Order Polynomial Ephemerides

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Roy Andrew Axelsen
P.O. Box 706, Kenmore, Queensland 4069, Australia

Received July 24, 2014; accepted July 28, 2014

Abstract

03 September New eJAAVSO preprint: 23 New Variable Stars

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eJAAVSO

23 New Variable Stars

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Maurice Clark
Texas Tech University, Physics Department, P.O. Box 41051, Lubbock, TX 79409

Received May 20, 2014, accepted June 30, 2014

28 August New eJAAVSO preprint: V393 Car, current light elements

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Current Light Elements of the δ Scuti Star V393 Carinae

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Roy Axelsen
P. O. Box 706, Kenmore, Queensland 4069, Australia

Received May 1, 2014; revised July 1, 2014; accepted July 1, 2014

28 August New eJAAVSO preprint: AL Pictoris and FR Piscium: Two Regular Blazhko RR Lyrae Stars

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AL Pictoris and FR Piscium: Two Regular Blazhko RR Lyrae Stars

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Pierre de Ponthière
15 Rue Pré Mathy, Lesve, Profondeville 5170, Belgium

Franz-Josef (Josch) Hambsch
12 Oude Bleken, Mol, 2400, Belgium

Kenneth Menzies
318A Potter Road, Framingham, MA 01701

27 August Two new eJAAVSO preprints: Sloan Magnitudes for the Brightest Stars; BVRI Photometry of SN 2013ej

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Sloan Magnitudes for the Brightest Stars

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Anthony Mallama

14012 Lancaster Lane, Bowie, MD 20715

Received April 8, 2014; revised June 23, 2014; accepted July 8, 2014

Abstract

20 August New DSLR Observing Manual Available Free From AAVSO

The AAVSO is pleased to announce the availability of our new DSLR Observing Manual.

18 August Solar Bulletin - Volume 70, Number 7
The July 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484