Years of RXTE Monitoring of Anomalous X-ray Pulsar 4U 0142+61: Long-Term Variability
Yellow and Red Supergiants in the Large Magellanic Cloud
Yellow evolved stars in open clusters
Yellow giants - A new class of radial velocity variable?
Yellow giants in young clusters. I - Photometric observations
Yellow hypergiant interferometry: A clue to understanding evolutionary instability
Yellow supergiant reddenings from BVRI data
Yellow supergiants as supernova progenitors: an indication of strong mass loss for red supergiants?
Yellow Supergiants in the Andromeda Galaxy (M31)
Yellow Supergiants in the Small Magellanic Cloud (SMC): Putting Current Evolutionary Theory to the Test
Yerkes actinometry. Zone +73deg to +90deg.
Yerkes Observatory
Yerkes Observatory University of Chicago, Bulletin No. I.
Yes, High School Students Can Analyze Chandra Data
Yes, it is the Image of an Exoplanet
Yes, semiclassical zero temperature black holes exist
Yes, the Sun is located near the corotation circle
Yet another fast multipole method without multipoles --- Pseudo-particle multipole method
Yet another galaxy identification for an ultraluminous X-ray source
Yet Another Model of Gamma-Ray Bursts