scholarly journals Spectral Classification from Low Dispersion Objective Prism spectra taken with the UK 1.2m Schmidt Telescope

1979 ◽  
Vol 47 ◽  
pp. 259-270
Author(s):  
K. Nandy
Keyword(s):  
Red Shift ◽  
Spectral Classification ◽  
Schmidt Telescope ◽  
Objective Prism ◽  
Measuring Machine ◽  
The Uk ◽  
Low Dispersion

AbstractA thin prism (with a dispersion of 2480 Å/mm at Hγ and Hβ) is now available for the UK 1.2m Schmidt telescope. Å 60-min. unwidened exposure on a Ilia-J (hypersensitized) emulsion reaches fainter than 20 mag. The spectra are measured and digitised with the fast measuring machine COSMOS. A method to determine the red shift of faint galaxies and the spectral classes of faint stars and galaxies from the digitised spectra will be described.

scholarly journals Automated Quasar Detection

1983 ◽  
Vol 104 ◽  
pp. 31-31
Author(s):  
Roger G. Clowes ◽  
John A. Cooke ◽  
Steven M. Beard
Keyword(s):  
Selection Effects ◽  
Schmidt Telescope ◽  
Royal Observatory ◽  
Objective Prism ◽  
Measuring Machine ◽  
The Uk

The existing spectral searches for quasars have increased the number of quasars known very substantially but have not contributed proportionately to an understanding of the collective properties because of the selection effects. To fully exploit the spectral searches we have developed the technique of automated quasar detection (AQD) using objective-prism plates from the UK Schmidt Telescope, the COSMOS measuring machine at the Royal Observatory Edinburgh, and the STARLINK nodes at Durham and Edinburgh.

scholarly journals Bright Stars in Five LMC Star Clusters

1986 ◽  
Vol 116 ◽  
pp. 417-418
Author(s):  
E. Kontizas ◽  
E. Xiradaki ◽  
M. Kontizas
Keyword(s):  
Star Clusters ◽  
Spectral Classification ◽  
Schmidt Telescope ◽  
Binocular Microscope ◽  
Objective Prism ◽  
Low Dispersion

The bright stars of five LMC clusters were classified for deriving the distribution of various spectral types. The studied clusters are very young (NGC 2093) young (NGC 1818, NGC 2157) intermediate (NGC 1831) and old (NGC 1806) (Van den Bergh 1981). The spectral classification of the stars was carried out using film copies of the 1.2 m Schmidt telescope objective prism plates. Medium dispersion (830 Å at Hγ) unwidened YJ and widened UJ and low dispersion (2440 Å at Hγ) UJ were examined by means of a binocular microscope. Details of the criteria used for the classification are described by Kontizas et al (1985).

The Medium Dispersion Prism of the UK Schmidt Telescope

1982 ◽  
Vol 4 (4) ◽  
pp. 468-474 ◽  
Author(s):  
R. D. Cannon ◽  
J. A. Dawe ◽  
D. H. Morgan ◽  
Ann Savage ◽  
M. G. Smith
Keyword(s):  
Schmidt Telescope ◽  
Objective Prism ◽  
The Uk ◽  
Low Dispersion

The U.K. 1.2 metre Schmidt Telescope acquired its first full aperture objective prism in 1975. This was a very low dispersion prism (2400 Å/mm at 4300 Å) which has been found to be particularly useful in searching for faint QSO’s.

scholarly journals Low-dispersion objective prism spectra from the UK 1.2-m Schmidt telescope

1977 ◽  
Vol 178 (1) ◽  
pp. 63P-66P ◽  
Author(s):  
K. Nandy ◽  
V. C. Reddish ◽  
K. P. Tritton ◽  
J. A. Cooke ◽  
D. Emerson
Keyword(s):  
Schmidt Telescope ◽  
Objective Prism ◽  
The Uk ◽  
Low Dispersion

scholarly journals Low-dispersion spectroscopy of blue stars from the UK Schmidt Telescope UBVRI survey

1992 ◽  
Vol 258 (3) ◽  
pp. 521-526 ◽  
Author(s):  
D. E. Holmgren ◽  
R. J. H. McCausland ◽  
P. L. Dufton ◽  
F. P. Keenan ◽  
D. Kilkenny
Keyword(s):  
Schmidt Telescope ◽  
The Uk ◽  
Low Dispersion

scholarly journals Objective-Prism Galaxy Redshifts in Fields Around the South Galactic Pole

1984 ◽  
Vol 78 ◽  
pp. 405-408 ◽  
Author(s):  
Q.A. Parker ◽  
H.T. MacGillivray ◽  
R.J. Dodd ◽  
J.A. Cooke ◽  
S.M. Beard ◽  
...  
Keyword(s):  
Large Scale ◽  
Schmidt Telescope ◽  
The South ◽  
Large Numbers ◽  
Objective Prism ◽  
The Uk

AbstractMeasurements made with the COSMOS machine on deep objectiveprism photographs taken with the UK 1.2m Schmidt Telescope are being used to obtain approximate redshifts (accurate to ~ 0.01 in z) for large numbers of galaxies in fields near the South Galactic Pole. The data are suitable for investigations of the distribution of galaxies, such as the detection of large-scale density enhancements or voids.

scholarly journals Contributions and Prospects for Spectral Classification of Stars with Objective Prism Techniques

1979 ◽  
Vol 47 ◽  
pp. 127-136
Author(s):  
E. K. Kharadze
Keyword(s):  
Galactic Structure ◽  
Spectral Classification ◽  
Missing Mass ◽  
Mass Problem ◽  
Important Stage ◽  
Objective Prism ◽  
Low Dispersion

The following topics will be discussed: a) A few historical comments; b) MK classification - the most important stage of classification work; c) Recently revealed peculiarity features and the problem of further differentiation of the classification scale; d) Classification work in the USSR; e) The role of classification results with respect to galactic structure studies; f) Low dispersion spectra and faint M-type stars and the missing mass problem; g) Extraterrestrial spectral observations: new promising means for research.

scholarly journals Preliminary Investigation of Quantitative Spectral Classification by Means of Objective-Prism Spectra Obtained with the Broerfelde Schmidt Telescope

1973 ◽  
Vol 50 ◽  
pp. 134-137
Author(s):  
J. V. Clausen
Keyword(s):  
Preliminary Investigation ◽  
Spectral Classification ◽  
Schmidt Telescope ◽  
Mean Error ◽  
Objective Prism ◽  
Hydrogen Lines

Different methods, used for measuring the strength of hydrogen lines in objective-prism spectra, are discussed and the parameters are compared with the photoelectric β-index. It is found that for A5V–G1V stars β can be given with a mean error of ±0.m020 (one spectrum).

scholarly journals A Test of the Accuracy of low Dispersion Objective Prism: Spectral Classification of Late-Type Stars Using DDO Photometry

1976 ◽  
Vol 72 ◽  
pp. 73-73
Author(s):  
J. J. Clariá ◽  
W. Osborn
Keyword(s):  
Band System ◽  
Class I ◽  
Spectral Features ◽  
Spectral Classification ◽  
Late Type ◽  
Intermediate Band ◽  
Metal Abundance ◽  
Objective Prism ◽  
Low Dispersion

A test has been made of the reliability of the multidimensional classification of late-type stars from low dispersion objective prism plates recently attempted by Stock and Wroblewski. Such classification at low dispersion is difficult due to the problem of separating the effects of luminosity from those of abnormal metal abundance. A sample of the stars classified by Stock and Wroblewski as metal weak (pec) and of those classified as luminous stars (class I) were observed using the DDO intermediate-band system. The photometry shows that the stars classified as pec are indeed population II giants, of low metal abundance ([Fe/H] < −1.0). The stars classified as I, however, were found in general not to be true supergiants but rather a mixture of various types of giants, such as CN strong stars, with spectral features that resemble, in one way or another, those of higher luminosity stars.

The UKST Survey of Planetary Nebulae in the Small Magellanic Cloud

1995 ◽  
Vol 148 ◽  
pp. 415-418
Author(s):  
D. H. Morgan
Keyword(s):  
Spatial Distribution ◽  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Small Magellanic Cloud ◽  
Schmidt Telescope ◽  
Objective Prism ◽  
The Uk

AbstractThis paper describes the results of searches for planetary nebulae on seven objective prism plates which were taken with the UK 1.2m Schmidt Telescope and cover the entire Small Magellanic Cloud. A total of 62 objects were detected; their spatial distribution is discussed.

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