…continuedA Treasure-Trove of Variable Stars
Notes on These New Variables
"Mining Hipparcos’s Buried Treasure," for all of these stars are tentatively classed in ESA's Hipparcos and Tycho Catalogues as eclipsing binaries close, unresolved pairs in which one star circles another in an orbit nearly edge on to our view. Probably neither component varies by itself, but their combined brightness drops each time one passes in front of the other and blocks some or all of its light.
A few stars on this list may stay constant for months or years before exhibiting any telltale dip. The mere fact that no one noticed their variations in the past tells us so. The Hipparcos mission, which lasted from late 1989 through mid-1993, made only 30 to 380 measurements of any given star not enough, in most cases, to produce a reliable light curve or establish the period unambiguously.