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Solar Bulletin - Volume 74, Number 08

The August Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The August SID Data report is available here: https://www.aavso.org/sid-database

LPV of the Month September, 2018

S Aurigae

A Carbon Star

Summary

This month's Long Period Variable (LPV) star, S Aur, should be a treat for Visual observers. S Aur is a fairly bright but very dark red Carbon star.  It’s B-V index is between ~3.5 to ~5, making it a very red object. (The B-V ratio seems to change over time, which might be investigated in the future with a focus on the B, V, and Ic bands.)

From Wikipedia:

Alert Notice 649: Dwarf nova outburst of GK Per (N Per 1901)

Note: Although this outburst of GK Per has been over for some time, ongoing good coverage is requested.  -  Elizabeth O. Waagen, 13 April 2020

August 24, 2018: The old nova GK Per (N Per 1901), which has dwarf nova (minor) outbursts, appears to be going into outburst, according to observations reported to the AAVSO. Recent observations include:

Solar Bulletin - Volume 74, Number 07

The July Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The July SID Data report is available here: https://www.aavso.org/sid-database

Alert Notice 647: Nova in Ophiuchus - N Oph 2018 No. 3 = PNV J17422408-2053088

August 13, 2018

Event: Nova in Ophiuchus - N Oph 2018 No. 3 = PNV J17422408-2053088

Discovered by: C. Jacques, J. Barros, E. Pimentel, and P. Holvorcem, on behalf of the Brazilian Transient Search - BraTS (at SONEAR Observatory, Oliveira, Brazil); via TOCP

Discovery magnitude: unfiltered CCD magnitude 11.1 (on three frames, 10-sec exposure, using an astrograph 11" f/2.2 + CCD camera)

Discovery date: 2018 August 08.9596 UT

Alert Notice 646: VW Hyi in outburst and monitoring needed for multiwavelength campaign

August 6, 2018 : Further to AAVSO Alert Notice 640, the SU UMa-type dwarf nova VW Hyi is in outburst and is the subject of a multiwavelength campaign designed to detect possible radio emission during the outburst.

LPV of the Month August, 2018

R Leo Minoris

R LMi is an interesting Mira star that has been observed by AAVSO observers and members since 1865.  Over 21,000 observations are in the AID from over 900 different observers as can be seen in the light curve shown below which displays all observations in the AID.  It is one of the Legacy LPV Program stars.  It was observed initially in the 1860’s-1870’s before a cessation in observations occurred.  Reasonable coverage did not commence again until the establishment of the AAVSO in 1911.

Alert Notice 645: Monitoring of LPVs for Maser Study

Note: This campaign has been extended to October 2020 and the list of targets has been revised. Please see AAVSO Alert Notice 687 for details. - Elizabeth O. Waagen, December 4, 2019

July 31, 2018: Michael Stroh (Ph.D. candidate, University of New Mexico) requests AAVSO assistance in monitoring 19 LPVs in support of a VLA campaign studying SiO masers. AAVSO monitoring begins now and goes through October 2019.

Alert Notice 644: FO Aqr monitoring requested in faint-state study

Note: As of June 2020, the REQUESTED OBSERVING CADENCE IS CHANGED. Please obtain at least one long light curve (time series) per month per observer while FO Aqr is in its high state. This cadence will help to enable keeping track of the rapidly changing spin period.  The cadence should be higher if FO Aqr goes into its low state.  -  Elizabeth O. Waagen, 21 June 2020

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