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EK Draconis: Long-term photometry on Sonneberg Sky-Patrol plates
We performed long-term photometry of the young solar analog EK Draconis(HD 129333) using 1030 blue-sensitive Sky-Patrol plates taken atSonneberg Observatory from 1958 onwards. A secular dimming of 0.0057+/-0.0008 mag/y beginning around 1975 was found. Hence, the recent trendfirst observed with Automatic Photoelectric Telescopes (APTs) isconfirmed and traced back to the mid-seventies.
| Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm
| The Program to Link the HIPPARCOS Reference Frame to an Extragalactic Reference System Using the Fine Guidance Sensors of the Hubble Space Telescope
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1997AJ....114.2796H&db_key=AST
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Ejderha |
| Sað Açýklýk: | 14h36m17.78s |
| Yükselim: | +63°27'56.1" |
| Görünürdeki Parlaklýk: | 8.074 |
| Uzaklýk: | 160.772 parsek |
| özdevim Sað Açýklýk: | -16.3 |
| özdevim Yükselim: | 18.1 |
| B-T magnitude: | 8.52 |
| V-T magnitude: | 8.111 |
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