A scanning microphotometer with an on‐line data reduction for large field Schmidt plates

Fritze, K.; Lange, Marta; Möstl, G.; Oleak, H.; Richter, G. M.

doi:10.1002/asna.19772980402

Cited by 38 publications

(14 citation statements)

References 3 publications

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“…DDO 92: Photoelectric UBV measurements (DE VAUCOULEURS et al 1981). UGC 6456 = V I I Zw 403: Detailed investigation in the articles of GAROZZI et al (1974) and FISHER and TULLY (1979). DDO r65: Radial velocity and absolute magnitude from FISHER and TULLY (1979 KRAAN-KORTEWEG and TAMMANN (1979)…”

Section: List Of Dwarf Members In M 81/82 Group Of Galaxiesmentioning

confidence: 99%

Dwarf Galaxies in the M 81/82 Group. New Photometric Data

et al. 1982

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We present a list of 39 dwarf galaxies of the M 81/82 group. Three different methods are applied to determine their apparent integral magnitude : digital processing, equidensitometry, and calculation according to the formulae of FISHER and TULLY. The plates used were obtained with the Tautenburg Schmidt telescope. For a distance of the group of 3.5 Mpc the absolute magnitudes of the dwarf galaxies investigated are -15m < M < -gmEs wird eine Liste von 39 Zwerggalaxien, die zur M 81/8~-Gruppe gehciren, vorgelegt. Drei verschiedene Methoden wurden zur Bestimmung der scheinbaren Integralhelligkeiten angewandt : digitale Flachenphotometrie, Aquidensitometrie und die Methode von FISCHER und TULLY. Es wurden Platten des Tautenburger Schmidt-Teleskopes benutzt. Bei einer Entfernung der Gruppe iron 3.5 Mpc liegen die absoluten Helligkeiten der untersuchten Zwerggalaxien in dem Helligkeitsinterval1 -15m < M < -gm.

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Section: List Of Dwarf Members In M 81/82 Group Of Galaxiesmentioning

confidence: 99%

Dwarf Galaxies in the M 81/82 Group. New Photometric Data

et al. 1982

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“…The plates were scanned with the microdensitometer and processed with the programm system of the Sternwarte Babelsberg of the Central Institute for Astrophysics of the Academy of Sciences of the GDR (FRITZE et al (1977), RICHTER (1 978)). Because there are no calibration wedges or sensitometer points on the plates, the photographic density cannot be converted to an intensity.…”

Section: Measurementsmentioning

confidence: 99%

“…The examinations of archival plates in some observatories (SCHAEFER (1981), HUDEC et al (1984), SCHOLZ (1984), ATTEIA et al (1985), GREINER, FLOHRER (1985), HUDEC et al (1986)) have yielded several possible candidates, but the findings are not compelling yet. Particularly, there is no case of a second simultaneous exposure demonstrating the reality of the flash.…”

Section: Introductionmentioning

confidence: 96%

Density profiles of suspected optical counterparts of gamma‐ray bursts

Greiner¹,

Lorenz

Richter

1987

Astron Nachr

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Four suspected optical flashes on archival plates with coordinates within or near to the error boxes of gamma-ray bursts, respectively, are investigated by surface photometry, Their density profiles are shown to be consistent with that of stars of similar magnitude. Hence, the suspected flashes are not likely to be plate defects but real objects on the sky.Vier vermutete optische Einzelereignisse auf Archivplatten mit Koordinaten innerhalb beziehungsweise sehr nahe an den Fehlerboxen von Gammaausbruchen wurden flachenphotometrisch untersucht. Die Schwanungsprofile erwiesen sich als konsistent mit denen von Sternen ahnlicher Helligkeit. Es handelt sich also kaum um Plattenfehler, sondern um reale Objekte am Himmel.

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“…Device and methods were described in two papers by FRITZE et al (1977. The plates were taken with the 52inch Schmidt telescope of the Karl Schwarzschild Observatory at Tautenburg.…”

Section: Introductionmentioning

confidence: 99%

“…The corresponding informations are given in Table 2. The investigated Geld was scanned with the microphotometer and reduced with the software system described in the above mentioned papers (FRITZE et al 1977. The size of the scanning diaphragm was 40 pm = 2 arc sec, the step width 20 pm.…”

Section: Introductionmentioning

confidence: 99%

Investigation of clusters of galaxies II. A two colour photometry for the cluster Abell 1795

Baier

Ziener

1988

Astron Nachr

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A photographic photometry in B and V was performed for the cD cluster of galaxies A 1795 which is located near the north galactic pole. Our catalogue contains 721 galaxies in a field of 1.6 0" around thecluster center.Eine photographische Photometrie in B and V wurde fur den cD-Haufen A 1795 durchgefuhrt. Dieser Haufen liegt in der N&he des galaktischen Nordpols. Unser Katalog enthalt 721 Galaxien in einem Gebiet von 1.6 0" um das Haufenzentrum.Key words: clusters of galaxies -photometry IntroductionThe cluster A 1795 is located at a(1950) = 13h41m6 and 6(1950) = 26'50'. The basic parameters of this cluster according to the compilation of STRUBLE and ROOD (1982) are presented in Table 1. The distribution of galaxies in this cluster was investigated by BAHCALL (1975), BAIER and ZIENER (1977), and BAIER (1979). All these papers deal only with the investigation of the number density of this cluster. The core radius yields to 0.28 Mpc according to BAHCALL (1975) and BAIER and ZIENER (1977). The total cluster radius and the total cluster population according to BAIER (1979) are R = 3 Mpc and N = 120, respectively. Isopleths for the distribution of the number density in the field of this cluster are given by BAIER and ZIENER (1977) and by BAIER (1979). HOESSEL et al. (1980), HOESSEL and SCHNEIDER (1985), ROMANISHIN (1986), andMURPHY et al. (1983) carried out a photometry of the central cD galaxy. Up to the present time there is no photometry for the whole cluster. Now we performed a photometry in B and V in a field of 1?26 x 1?26 around the cluster center. = Number of galaxies in the cluster according to ABELL (1980) Observational material and data reductionThe photometry was performed by means of the microphotometer of the Central Institut for Astrophysics. Device and methods were described in two papers by FRITZE et al. (1977. The plates were taken with the 52inch Schmidt telescope of the Karl Schwarzschild Observatory at Tautenburg. The corresponding informations are given in Table 2.

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A scanning microphotometer with an on‐line data reduction for large field Schmidt plates

Cited by 38 publications

References 3 publications

Dwarf Galaxies in the M 81/82 Group. New Photometric Data

Dwarf Galaxies in the M 81/82 Group. New Photometric Data

Density profiles of suspected optical counterparts of gamma‐ray bursts

Investigation of clusters of galaxies II. A two colour photometry for the cluster Abell 1795

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