X Leonis, 1970-1979
X line distribution determined from earthward and tailward convective bursty flows in the central plasma sheet
X marks the SPOT - Distribution and excitation of unidentified molecules in the Red Rectangle
X Muscae-A Large Amplitude Red Variable
X Ophiuchi
X Per-Optical circular polarization
X Per: The Template Sightline for the Diffuse Interstellar Medium
X Persei
X Persei
X Persei
X Persei
X Persei
X Persei
X Persei
X Persei
X Persei (= 4U 0352+30)
X Persei - Optical 13.9-minute periodicity
X Persei - Optical polarization variation on the 580 day binary-like period
X Persei active again!
X Persei an X-ray Source?