News and Announcements
|08 November||Special Notice #307: Observations crucial tonight for SDSS J001153.08-064739.1||
November 8, 2012: The HST COS far ultraviolet observations of the dwarf nova SDSS J001153.08-064739.1 have been scheduled for 2012 November 9 20:42:29 UT through November 10 04:57:33 UT (AAVSO Special Notice #304).
|07 November||Special Notice #306: Telluric standards for T Tau stars campaign spectroscopists||
7 November 2012: Further to AAVSO Alert Notice 473 (www.aavso.org/aavso alert-notice/473), Principal Investigator Darryl Sergison (University of Exeter) requests that spectroscopists planning to observe the targets RY Tau, DN Tau, and/or DR Tau image the corresponding telluric standards below at the same time:
|06 November||101st Annual Meeting of the AAVSO - Archive||
Meeting Archive Materials:
|06 November||Alert Notice 473: T Tauri stars observing campaign||
November 6, 2012: Darryl Sergison (University of Exeter) has requested AAVSO assistance with a campaign he is organizing on six T Tauri stars. He writes: "In Autumn 2013 I [and my PhD supervisor Tim Naylor of Exeter University are] undertaking a new study into the nature of pre-main-sequence low mass stars, using time series optical spectroscopy and UV-Visual-IR photometry...to build a clearer picture of the environment around young solar-type stars and characterise their various disc, accretion, and outflow structures.
|05 November||New eJAAVSO preprint: Period Analysis of 55 Semiregular (SR/SRa/SRb) Variables||
ej222: "Period Analysis of AAVSO Visual Observations of 55 Semiregular (SR/SRa/SRb) Variables"
|05 November||Special Notice #305: HST COS observations of FL Psc (ASAS J002511+1217.2) scheduled||
November 5, 2012: Further to AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden), the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of THE NEXT TARGET from the list, the WZ Sge-type cataclysmic variable
|05 November||Publication deadlines to remember||
APPROACHING PUBLICATION DEADLINES TO REMEMBER
December 15, 2012 AAVSO Annual Report (Section Reports, Meeting Minutes, Treasurer's Report, Director's Report, Development)
December 15, 2012 AAVSO Newsletter (any contributions)
|31 October||Special Notice #304: HST COS observations of SDSS J001153.08-064739.1 scheduled||
October 31, 2012: Further to AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden) and AAVSO Special Notice #298, the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of THE NEXT TARGET from the list, the dwarf nova-type cataclysmic variable
|31 October||Special Notice #303: VLBA and e-MERLIN observations of SS Cyg underway||
October 31, 2012: The cataclysmic variable SS Cyg is beginning to decline from what appears to be a narrow outburst, and was at visual magnitude 9.1 on 2012 October 30, according to observations in the AAVSO International Database.
|31 October||New eJAAVSO preprint: Ross variables revisited. II by W. Osborn and O. F. Mills||
ej 221: "The Ross Variable Stars Revisited. II" by W. Osborn and O. F. Mills
|29 October||VStar version 2.14.0||
A new version of VStar has just been released (the previous version was released in April 2012).
To get it, please visit http://www.aavso.org/vstar-overview and click "Download VStar Now".
|26 October||New eJAAVSO preprint: on Variability type determination and high precision ephemeris for NSVS 7606408||
ej 220: "Variability Type Determination and High Precision Ephemeris for NSVS 7606408" by R. Furgoni
|24 October||Special Notice #302: HST COS observations of 1RXS J023238.8-371812 scheduled||
October 24, 2012: Following on AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden, www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #298 (www.aavso.org/aavso-special-notice-298), the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of THE NEXT TARGET from the list, the WZ Sge-type cataclysmic variable
|24 October||Four new eJAAVSO preprints||
ej216: "BVRI Photometry of SN 2011fe in M101" by M. W. Richmond and H. A. Smith
ej217: "The Pulsation Period of the Hot Hydrogen-Deficient Star MV Sgr" by J. R. Percy and R. Fu
ej218: "Period Changes in RRc Stars" by J. R. Percy and P. J. Tan
ej219: "The Citation of Manuscripts Which Have Appeared in JAAVSO" by A. U. Landolt
|24 October||Special Notice #301: Retraction of Special Notice #300||
October 23, 2012: Multiple observers have checked the Hyades and found no evidence of the transient mentioned in by I. Shelton in ATel #4513. There is no object visible in the field according to observations by Patrick Schmeer, Emmanuel Conseil, and Ulisse Munari. Doug Welch notes that the object appears non-stellar on the image that was posted to Shelton's website, and suggests it may be the product of a cosmic ray hit.
|23 October||Two new eJAAVSO preprints||
ej214: "VSX J071108.7+695227: a Newly Discovered Short-period Eclipsing Binary" by M. Damasso, et al.
ej215: "A Practical Approach to Transforming Magnitudes onto a Standard Photometric System" by D. Boyd
|19 October||Alert Notice 472: Monitoring of HD 5980 requested for multiwavelength campaign||
October 19, 2012: Dr. Noel Richardson (Universite de Montreal, formerly at Georgia State University) has requested monitoring of the Small Magellanic Cloud eclipsing binary HD 5980 (in Tucana) as part of a multiwavelength campaign he is coordinating to study this unusual system. Dr. Richardson writes:
|17 October||Solar Bulletin - Volume 68, Number 9||
The September 2012 Solar Bulletin is now available!
|11 October||The AAVSO Newsletter - October 2012 - is published||
AAVSO Newsletter 54 - October 2012
|11 October||Annual Meeting Reminder: Hotel Deadline extended!||
Don't forget to register for the AAVSO Annual Meeting!
For more information please visit the Annual Meeting Description Page. We hope to see you in November!
|11 October||New eJAAVSO: on the variability of V538 Cas by G. Holmberg||
ej213: A Note on the Variability of V538 Cassiopeiae by G. Holmberg
|10 October||Special Notice #299: Observations needed TODAY of SDSS J164248.52+134751.4||
October 10, 2012: Dr. Boris Gaensicke (leader of the consortium observing CVs with the HST COS instrument; see AAVSO Alert Notice 471 and AAVSO Special Notice #297 for details and instructions) writes with an urgent message:
|06 October||Special Notice #298: Second set of HST COS CV targets announced||
October 6, 2012: Following on AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden, www.aavso.org/aavso-alert-notice-471), the second set of targets the HST COS (Cosmic Origins Spectrograph) will be observing has been announced.
|06 October||Special Notice #297: HST COS observations of SDSS J164248.52+134751.4 scheduled||
October 5, 2012: Following on AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden, www.aavso.org/aavso-alert-notice-471), the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of the cataclysmic variable SDSS J164248.52+134751.4 have been scheduled for 2012 October 12 from 01:03:27 to 06:21:43 UT.
|05 October||Annual Report for 2010-2011 is published||
The AAVSO Annual Report for FY 2010-2011 is now available online.