Description:
Double Long-Focus Astrograph (DLFA) has two tubes with photographic and photovisual objectives; D/F = 40/550; a 24 cm x 24 cm plate coves 2 degree x 2 degree of the sky with a scale of 37.5 arcsec/mm. Almost all of DLFA-projects were the sort of proper motions survey as a photographic part of the Faint Stars Catalogue project. Among them there are areas with galaxies and fundamental stars, areas with variable stars (long-period, semiregular and novae) and so-called the special program areas with open and globular clusters, close and visual binaries and star associations of the Orion Trapezium kind. These four projects include 5474 plates (Table 1). The bank includes four corresponding files: Limiting stellar magnitude of each plate can be estimated by means of Table 2. The data base of all photographic observations of celestial bodies of Golosiiv observatory is created by Pakulyak L. et al. [3].
References:
1. Deutsch, A.N. Lavdovskij, V.V. and Fatchikhin N.V.: 1955, Izv. Glavnoj astron. observ. v Pulkovo, vol. 20, 14. 2. Fatchikhin N.V. and Latypov, A.A.: 1959, Circular Tashkent. astron. observ., No. 302, 14. Izv. Glavnoj astron. observ. v Pulkovo, vol. 20, 14. 3. Pakulyak L. et al.: 1996, Newsletters on Wide-field imaging (in press.) 4. Zverev, M.S.: 1952, The Faint Stars Catalogue as an astrometric problem, Academy of Science of USSR, Moscow, 81 pp.
Table 1. The distribution of the plates over projects _____________________________________________________________ Project Number of Number sky areas of plates _____________________________________________________________ Galaxies 164 1103 Fundamental stars 402 1769 Variable stars 211 788 Special programme 379 1814 _____________________________________________________________ Table 2. Limiting stellar magnitude _____________________________________________________________ Emulsion, Declination [degree] Plates with Band -13 -+10 +10- +30 +30 -+60 gratings _____________________________________________________________ image order zero first _____________________________________________________________ Exposure time [min] _____________________________________________________________ 60 5 60 5 60 5 20 20 _____________________________________________________________ Agfa-Astro, B 15.8 13.6 15.5 13.6 15.7 13.3 14.7 10.9 Ilford, B 16.0 16.0 Kodak OaO, B 16.0 14.1 16.3 14.7 16.1 14.8 15.5 12.5 ORWO ZU-1,2, B 15.9 16.2 14.1 16.1 14.1 14.4 11.5 ORWO ZU-21, B 15.6 14.0 15.7 14.4 16.0 14.2 14.8 11.6 ORWO NP27, V 13.6 11.7 13.9 11.9 14.2 11.9 _____________________________________________________________Table 3. Data bite to bite description _______________________________________________________________________________ Column Bytes Format Design Units Remarks _______________________________________________________________________________ 1 1- 8 a8 Name - Name of the sky area in accordance with the log-book. For galaxies: Number of the field according to [1, 2] or NGC number of central galaxy; For fundamental stars: Number of fundamental stars according to [4]; For variable stars: Name of star according to GCVS (General Catalogue of Variable Stars); For special programme: Number of multiply system according to ADS (Aitken Double Star catalogue), Number of cluster according to NGC or Messier, Name or BD number of central stars, Area; 2 9-14 a6 No - Number of the plate in accordance with the log-book, 4-digital number and following blank or flag "a". 3 15-20 f6.1 R.A.(1950) h, m Right Ascension of the equinox 1950.0; digitals 1,2 are hour, digitals 3,4,point, 5 are minute. 4 21-26 i6 Dec.(1950) o, ' Declination of the equinox 1950.0; 5-digital number, digital 1 is sign, digitals 2,3 are degree, digitals 4,5 are minute. 5 27-31 i5 Y year Year of observational epoch, 4-digital number. 6 32-34 i3 M month Month of observational epoch. 2-digital number. 7 35-37 i3 D day Day of observational epoch. 2-digital number. 8 38-41 i4 Ex.time min The first exposure time. 9 42-44 i3 min The second exposure time. 10 45-47 i3 min The third exposure time. 11 48-52 i5 h.a. min Hour angle. 12 53-59 a7 Em - Emulsion: io - Ilford Ordinary, ip - Ilford Process, iz - Ilford Zenith, aa - Agfa Astro, rotra - Rot Rapid, kodak - Kodak OaO, orwo01- ORWO ZU 01, orwo02- ORWO ZU 02, orwo21- ORWO ZU 21, np27 - ORWO NP 27. 13 60-63 a4 Band - Spectral band: ipg- International photographic, ipv- International photovisual. 14 64-66 i3 Ob - Code of observer, 2-digital number. 15 67-69 i3 S1 cm Gorizontal size of plate, 2-digital number. 16 70-72 i3 S2 cm Vertical size of plate, 2-digital number. 17 73-76 i6 tC degree C Air temperature. 19 77-78 a2 f - Remark 1, blank, g - plate with gratings, 6 - plate with hexagonal diaphragm. 20 79-87 a9 N - Remark 2, for special programme only: NGC number of stellar cluster. _______________________________________________________________________________