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lpv of the month

LPV of the Month July, 2018

SS Virginis

A Carbon Star

Summary

This month's Long Period Variable (LPV), SS Vir, should be a treat for visual observers. SS Vir is a bright but very dark red Carbon Star.  It’s B-V index is 4.20, making it one of the reddest object around.

LPV of the Month June, 2018

LPV of the Month May, 2018

T Ursae Minoris (T UMi)

Revisited

Summary

T Ursae Minoris (T UMi) is an LPV that has shown a dramatic increase in its period and decrease in its brightness over the last 39 years, so much so that it is no longer considered a Mira type of LPV but is now classified as a Semi-regular (SR) LPV.    

LPV of the Month February, 2018

Z Tauri

Z Tau is an interesting Mira that has been observed by AAVSO observers and members since 1904.  Nearly 6,000 observations are in the AID from over 400 different observers as can be seen in the light curve shown below which displays all observations in the AID.  It is not one of the Legacy LPV Program stars, however there is a good reason why it deserves some special attention! 

LPV of the Month January, 2018

JANUARY 2018

KHI CYGNI

Discovery

The German astronomer Gottfried Kirch discovered its variability in 1686, when in July of that year he observed that the star had disappeared from the sky, not being visible again until the month of October.

The data

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484