We present preliminary results of a possible cyclic activity of the are star II TAU based on are ... more We present preliminary results of a possible cyclic activity of the are star II TAU based on are activity observed during long monitoring campaign of the Pleiades region performed in 60-80-ies of the last century. Bayesian statistical analysis (Gregory-Loredo method for periodic signal detection of unknown shape in time-series with Poissonian and Gaussian errors) of the registered are times and released energies during the maximum of the ares indicates on a 3-3.5 year activity period.
The Bamberg Observatory Southern Sky Survey provided 93 photographic plates with the FU Orionis o... more The Bamberg Observatory Southern Sky Survey provided 93 photographic plates with the FU Orionis object BBW 76, clearly detectable in the time interval 1963-1976. We perform aperture photometry of BBW 76 from the 2 x 2 degrees area near target star scanned with the Epson Expression 1640 XL flatbed scanner. For each plate a transformation of plate magnitude to the GSC 2.2 magnitudes in B photographic band was found out for selected reference stars, and used for deriving B magnitudes of BBW 76. The analysis of the photometric behaviour of BBW 76 is presented.
The results from five-year work on the Bamberg Observatory plate collection from inventory to dig... more The results from five-year work on the Bamberg Observatory plate collection from inventory to digitization are presented. The project supported by the Alexander von Humboldt Foundation, Deutsche Forschung Gemeinschaft, and Bulgarian Academy of Sciences has begun since 2002. At present the information for about 28 000 plates from the Bamberg Southern and Northern surveys is accessible on-line from WFPDB (http://www.skyarchive.org). More than 700 plates are digitized with the professional flatbed scanner EPSON 1640XL. Two more tasks complete the overall project: digitization of the entire plate collection, started with some pilot fields as LMC/SMC, the Pleiades, etc. and linking the digitized information to German Astronomical Virtual Observatory (GAVO) and European Virtual Observatory. Some successful examples of using the Bamberg plate collection to study long-term variability of chromospherically active stars are present.
New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect in... more New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect information for the digitized Pleiades plates mainly in the field of 25 square degrees around Alcyone. Using the Wide-Field Plate Database (WFPDB, [http://www.skyarchive.org]) for the Pleiades plate search we found more than 3100 plates existing in the Asiago, Sonneberg, Harvard, Kyiv, and Moscow plate collections. The Pleiades cluster as one of the most observed stellar cluster, which is quite well visible in the Northern sky, is a basic one for many astronomical projects, carried out since the beginning of systematical photographic sky monitoring in 1872 (the Gould survey). More plates from the Asiago, Sonneberg, Harvard, Kyiv, and Moscow wide-field plate archives were scanned and added to the database.
New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect in... more New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect information for the digitized Pleiades plates mainly in the field of 25 square degrees around Alcyone. Using the Wide-Field Plate Database (WFPDB, [http://www.skyarchive.org]) for the Pleiades plate search we found more than 3100 plates existing in the Asiago, Sonneberg, Harvard, Kyiv, and Moscow plate collections.
The wide-field plate archives at disposal in Rozhen Observatory (9332 plates obtained in the peri... more The wide-field plate archives at disposal in Rozhen Observatory (9332 plates obtained in the period 1979 - 1994) and Belgrade Observatory (14500 plates obtained in the period 1936 - 1996) are presented. The plate archives, made in the frames of different observing programmes, reflect the tendencies in the development of astronomy in these countries. The results from the joint collaboration
The data in the Wide-Field Plate Database for the archived photographic observations obtained wit... more The data in the Wide-Field Plate Database for the archived photographic observations obtained with the 0.38 m refractor and the 0.16 m camera of the Bucharest Observatory in the context of the their repeated use are being analyzed. A summary of the observational programs carried out with these two instruments since 1930 is presented. Results from the scanning of selected
Proceedings of the International Astronomical Union, 2011
ABSTRACT We present the Wide-Field Plate Database, a basic source of data and meta-data for astro... more ABSTRACT We present the Wide-Field Plate Database, a basic source of data and meta-data for astronomy's more than 2.4 million wide-field photographic images obtained with professional telescopes worldwide. The technology developed in Sofia for plate digitization with commercial high-quality flatbed scanners yields low-resolution digital images for quick visualization and easy online access, and optimal high-resolution ones for photometric and astrometric investigations.
We present new photoelectric (UBV), photographic and visual observations of 22 selected symbiotic... more We present new photoelectric (UBV), photographic and visual observations of 22 selected symbiotic stars. The photoelectric observations were made in 1990-91, the photographic in 1982-91, while the visual observations cover the interval 1973-1991. Some interesting results can be summarized as follows: EG And: Descending branches of the light-curve preceding primary and secondary minima were observed in U. R Aqr: Visual
... In Mount John University Observatory the pro-gramme was executed by I. Paterson and M. Clark.... more ... In Mount John University Observatory the pro-gramme was executed by I. Paterson and M. Clark. In San Miguel Observatory the observations were done by F.-M. Sosna and A. Alarcon. All plates at present are stored in the observatory plate stacks in very good condi-tions. ...
We present preliminary results of a possible cyclic activity of the are star II TAU based on are ... more We present preliminary results of a possible cyclic activity of the are star II TAU based on are activity observed during long monitoring campaign of the Pleiades region performed in 60-80-ies of the last century. Bayesian statistical analysis (Gregory-Loredo method for periodic signal detection of unknown shape in time-series with Poissonian and Gaussian errors) of the registered are times and released energies during the maximum of the ares indicates on a 3-3.5 year activity period.
The Bamberg Observatory Southern Sky Survey provided 93 photographic plates with the FU Orionis o... more The Bamberg Observatory Southern Sky Survey provided 93 photographic plates with the FU Orionis object BBW 76, clearly detectable in the time interval 1963-1976. We perform aperture photometry of BBW 76 from the 2 x 2 degrees area near target star scanned with the Epson Expression 1640 XL flatbed scanner. For each plate a transformation of plate magnitude to the GSC 2.2 magnitudes in B photographic band was found out for selected reference stars, and used for deriving B magnitudes of BBW 76. The analysis of the photometric behaviour of BBW 76 is presented.
The results from five-year work on the Bamberg Observatory plate collection from inventory to dig... more The results from five-year work on the Bamberg Observatory plate collection from inventory to digitization are presented. The project supported by the Alexander von Humboldt Foundation, Deutsche Forschung Gemeinschaft, and Bulgarian Academy of Sciences has begun since 2002. At present the information for about 28 000 plates from the Bamberg Southern and Northern surveys is accessible on-line from WFPDB (http://www.skyarchive.org). More than 700 plates are digitized with the professional flatbed scanner EPSON 1640XL. Two more tasks complete the overall project: digitization of the entire plate collection, started with some pilot fields as LMC/SMC, the Pleiades, etc. and linking the digitized information to German Astronomical Virtual Observatory (GAVO) and European Virtual Observatory. Some successful examples of using the Bamberg plate collection to study long-term variability of chromospherically active stars are present.
New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect in... more New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect information for the digitized Pleiades plates mainly in the field of 25 square degrees around Alcyone. Using the Wide-Field Plate Database (WFPDB, [http://www.skyarchive.org]) for the Pleiades plate search we found more than 3100 plates existing in the Asiago, Sonneberg, Harvard, Kyiv, and Moscow plate collections. The Pleiades cluster as one of the most observed stellar cluster, which is quite well visible in the Northern sky, is a basic one for many astronomical projects, carried out since the beginning of systematical photographic sky monitoring in 1872 (the Gould survey). More plates from the Asiago, Sonneberg, Harvard, Kyiv, and Moscow wide-field plate archives were scanned and added to the database.
New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect in... more New results for the Pleiades Plate Database (PPDB) are presented. The database aims to collect information for the digitized Pleiades plates mainly in the field of 25 square degrees around Alcyone. Using the Wide-Field Plate Database (WFPDB, [http://www.skyarchive.org]) for the Pleiades plate search we found more than 3100 plates existing in the Asiago, Sonneberg, Harvard, Kyiv, and Moscow plate collections.
The wide-field plate archives at disposal in Rozhen Observatory (9332 plates obtained in the peri... more The wide-field plate archives at disposal in Rozhen Observatory (9332 plates obtained in the period 1979 - 1994) and Belgrade Observatory (14500 plates obtained in the period 1936 - 1996) are presented. The plate archives, made in the frames of different observing programmes, reflect the tendencies in the development of astronomy in these countries. The results from the joint collaboration
The data in the Wide-Field Plate Database for the archived photographic observations obtained wit... more The data in the Wide-Field Plate Database for the archived photographic observations obtained with the 0.38 m refractor and the 0.16 m camera of the Bucharest Observatory in the context of the their repeated use are being analyzed. A summary of the observational programs carried out with these two instruments since 1930 is presented. Results from the scanning of selected
Proceedings of the International Astronomical Union, 2011
ABSTRACT We present the Wide-Field Plate Database, a basic source of data and meta-data for astro... more ABSTRACT We present the Wide-Field Plate Database, a basic source of data and meta-data for astronomy's more than 2.4 million wide-field photographic images obtained with professional telescopes worldwide. The technology developed in Sofia for plate digitization with commercial high-quality flatbed scanners yields low-resolution digital images for quick visualization and easy online access, and optimal high-resolution ones for photometric and astrometric investigations.
We present new photoelectric (UBV), photographic and visual observations of 22 selected symbiotic... more We present new photoelectric (UBV), photographic and visual observations of 22 selected symbiotic stars. The photoelectric observations were made in 1990-91, the photographic in 1982-91, while the visual observations cover the interval 1973-1991. Some interesting results can be summarized as follows: EG And: Descending branches of the light-curve preceding primary and secondary minima were observed in U. R Aqr: Visual
... In Mount John University Observatory the pro-gramme was executed by I. Paterson and M. Clark.... more ... In Mount John University Observatory the pro-gramme was executed by I. Paterson and M. Clark. In San Miguel Observatory the observations were done by F.-M. Sosna and A. Alarcon. All plates at present are stored in the observatory plate stacks in very good condi-tions. ...
Uploads