VizieR Online Data Catalog: Variability in C-rich proto-PNe. (Hrivnak+, 2010)
Abstract
Photometric observations were made at the Valparaiso University Observatory (VUO). The observing program was begun in earnest in the summer of 1994, with observations made using only the V (Johnson) filter. Beginning in the summer of 1995, occasional observations were made through the R (Cousins) filter to investigate color variations, and these were continued with increased frequency. Since summer 2002, the V and R observations have consistently been made together. Integration times were adjusted with a goal of obtaining a precision of σ<=+/-0.01mag.
(5 data files).- Publication:
-
VizieR Online Data Catalog
- Pub Date:
- March 2012
- DOI:
- 10.26093/cds/vizier.17091042
- Bibcode:
- 2012yCat..17091042H
- Keywords:
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- Photometry: VRI;
- Effective temperatures;
- Planetary nebulae;
- Stars: giant;
- Stars: carbon