H_2 Emission as a Large-Scale Tracer of Molecular Hydrogen in Interstellar Clouds

H_2 Emission From the Large Magellanic Cloud

H_2 formation pumping signatures: a modellist's view

H_2 in the Quadrupolar Planetary Nebula NGC 6881

H_2 Quadrupole and H^+_3 Emission from Uranus: The Uranian Thermosphere, Ionosphere, and Aurora

H_2 Velocity Structure in the Molecular Outflow DR 21

H_2CO in the Horsehead nebula

H_2O Activity of Comet Hale-Bopp

H_2O Ice in the Envelopes of OH/IR Stars

H_3(+) Emission at the Foot of the Io Flux Tube

H_alpha Observations of SS Cyg at Quiescence and Outburst

H_gamma Line Spectrum of Intermediate Polars

H_α Survey of Galaxies in Hickson Compact Groups

Hɛ Emission in the Spectrum of Arcturus

Hα and Far-infrared Correlation in Early-type Spirals

Hα -Derived Star-Formation Rates of 0.6 < z < 0.8 Galaxy Clusters

Hα absolute Chromospheric fluxes in G and K. stars

Hα Activity and the Light Curve of the RS Canum Venaticorun Star DH Leo (HD86590)

Hα Activity in the RS CVn System, SZ Psc

Hα Activity in X-Ray Bright Points and the Origin of Spicules