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Improved distances to several Galactic OB associations
Improved distances several Galactic associations
2011/10/11
Based on uvbybeta photometry we study the structure of several Galactic star-forming fields. Lac OB1 is a compact association at 520+/-20 pc spatially correlated with a region of intense HII emission ...
Distances of Galactic Planetary Nebulae Based on a Relationship Between the Central Star Mass and the N/O Abundance
ISM abundances planetary nebulae
2009/6/4
Distances of Galactic Planetary Nebulae Based on a Relationship Between the Central Star Mass and the N/O Abundance。