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Estimation of stellar intrinsic colours, distances and colour excesses based on the Stromgren and H-beta photometry of 804 B, A, and F stars in 10 Selected Areas
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1989A&AS...78..105F&db_key=AST
| Four-colour UVBY and H-beta photometry of all A and F stars brighter than MPG of about 11.0 mag in 4 Selected Areas at intermediate galactic latitudes
As a second part of an investigation of the distribution of interstellardust in the solar vicinity, uvby-beta photometry has been obtained for260 stars of spectral types A and F, and brighter than mpg of11.0 mag in four Kapteyn's Selected Areas. The observed areas are: SA95, SA 120, SA 168, and SA 200. They are centered at intermediategalactic latitudes, in the range from b of about -38 deg to -42 deg.From the observed (b-y) versus beta diagrams it can be seen that starsin SA 95 are strongly affected by reddening, while the other areas showvery little absorption.
| The nebula L 1569 - an accurate distance determination
Stromgren photometry for 40 A an F type stars belonging to the SelectedArea 95 is used to derive the distance of the dark cloud L 1569.Inspection of UVBY-Beta diagrams shows clearly that several stars almosthave the same reddening, suggesting the presence of an absorbing layerin front of them. From the E(b-y)-distance data, a distance of 130 + or- 20 pc is suggested for this cloud, which locates, at least in part,the IRAS IR cirrus source that lies at the same direction. The star HD25154 is suspected to be a premain-sequence star inside L 1569.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Boga |
| Sað Açýklýk: | 03h52m15.95s |
| Yükselim: | +01°14'36.4" |
| Görünürdeki Parlaklýk: | 10.485 |
| özdevim Sað Açýklýk: | -1 |
| özdevim Yükselim: | -6.4 |
| B-T magnitude: | 10.701 |
| V-T magnitude: | 10.503 |
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