... Watching the Stars go `Round and `Round . Abstract:. ... results from several seasons of photometric observations of X--ray sources in the Orion OB1a and OB1b star formation regions ...
... But, if the star is 0.5 Myr old star when it loses its disk, then, it will be a 4 ... By the time a star reaches the 1 day periods seen in some stars in Orion OB1a and b ...
... Next: Stars without Periods Up: Other Stars Previous: Stars with Highly . Periods could be determined for many other stars. ... In the histogram, the stars with the less secure period determinations trace the other stars well. ...
... Next: Rotation Periods of PMS Stars Previous: Direct Monitoring of PMS Stars . ... High--mass stars tend to rotate much more quickly than the low--mass stars. ... Once stars reach the main sequence, all stars experience a Skumanich--like slowdown ...
... Next: Discussion Up: Other Stars Previous: Stars with Less . ... 75 stars (Choi & Herbst 1996) and variability has been seen in 186 stars (Attridge ... stars had very little signal; at least 20% of the X--ray sources monitored exhibited ...
... While the bulk of these stars were located in the Orion OB1a and OB1b fields, two stars of particular interest were monitored from our Mount Stony Brook Observatory. ...