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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Irmak |
| Sað Açýklýk: | 04h49m41.61s |
| Yükselim: | -12°02'35.4" |
| Görünürdeki Parlaklýk: | 8.248 |
| Uzaklýk: | 862.069 parsek |
| özdevim Sað Açýklýk: | 5.3 |
| özdevim Yükselim: | -1.3 |
| B-T magnitude: | 8.247 |
| V-T magnitude: | 8.248 |
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