On using the CMD morphology of M67 to test solar abundances
On variations of the brightness of type Ia supernovae with the age of the host stellar population
On-disk coronal rain
On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines
One blind and three targeted searches for (sub)millisecond pulsars
One possible mechanism for massive neutron star supported by soft EOS
Ongoing surveys for close binary central stars and wider implications
Onset of Fast Magnetic Reconnection in Partially Ionized Gases
Onsets and spectra of impulsive solar energetic electron events observed near the Earth
Open and closed boundaries in large-scale convective dynamos
Open clusters in 2MASS photometry - I. Structural and basic astrophysical parameters
Open issues in stellar modelling
Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections
Optical and Infrared Imaging and Spectroscopy of the Multiple-Shell Planetary Nebula NGC 6369
Optical and Mid-Infrared Observations of the Planetary Nebula NGC 6781
Optical and near infrared coverage of SN 2004et: physical parameters and comparison with other type IIP supernovae
Optical and Near-Infrared Photometric Observation during the Superoutburst of the WZ Sge-Type Dwarf Nova, V455 Andromedae
Optical and Near-Infrared Photometry of Nova V2362 Cyg : Rebrightening Event and Dust Formation
Optical and Near-Infrared Spectroscopy of the L Subdwarf SDSS J125637.13-022452.4
Optical and Supersoft X-ray Light Curve Models of Classical Nova V2491 Cygni: A New Clue to the Secondary Maximum