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Photometric and spectroscopic analysis of high Galactic latitude molecular clouds. I - Distances and extinctions of stars toward 25 selected regions
The paper presents new photoelectric photometry in the UBV, uvby, andH-beta systems for 320 stars at high Galactic latitudes, selected fortheir proximity to the densest portions of a variety of high Galacticlatitude atomic and molecular clouds. Low-resolution digital spectra areemployed to classify 115 of the stars. Several novel techniques aredeveloped for automatic digital spectral classification, and fordereddening Stromgren uvby-beta and Johnson UBV,H-beta photometry. Anempirical determination of the errors in the derived dereddened colors,and techniques for converting between the two photometric systems arepresented on the basis of the analysis of a statistically significantsample of 1480 stars with complete data sets in both photometric systemsand with an accurate MK spectral type. New constraints on the distancesto several clouds are presented.
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| Сазвежђа: | Једра |
| Ректацензија: | 10h57m58.94s |
| Deклинација: | -42°02'21.8" |
| Apparent магнитуда: | 7.073 |
| Даљина: | 128.7 parsecs |
| Proper motion RA: | 5.5 |
| Proper motion Dec: | -12.8 |
| B-T magnitude: | 7.291 |
| V-T magnitude: | 7.091 |
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