scholarly journals Objective Prism Spectral Classification at the Stockholm Observatory

1973 ◽  
Vol 50 ◽  
pp. 85-90 ◽  
Author(s):  
B. Nordström ◽  
A. Sundman
Keyword(s):  
Milky Way ◽  
Spectral Classification ◽  
Late Type ◽  
Objective Prism ◽  
Spectral Survey

As a result of the spectral survey at the Stockholm Observatory finding lists are prepared for early and late type stars in the Southern Milky Way. In order to make the lists more useful we present the principles of the stellar classification.

scholarly journals Why We Need a Deep Spectral Survey of the Milky Way

1995 ◽  
Vol 148 ◽  
pp. 337-343 ◽  
Author(s):  
Omar M. Kurtanidze ◽  
Miriam G. Nikolashvili
Keyword(s):  
Near Infrared ◽  
Milky Way ◽  
Short Review ◽  
Late Type ◽  
Giant Stars ◽  
Infrared Spectral ◽  
Objective Prism ◽  
Type Giant ◽  
Spectral Survey ◽  
Low Dispersion

AbstractIn this short review we briefly discuss all the extensive low dispersion objective-prism spectral surveys carried out in the last fifty years for the study of the surface and space distributions of late-type giant stars, namely C stars. In the light of data obtained and new discoveries, the expediency of undertaking a deep mI low dispersion spectral survey in the near-infrared spectral region is considered.

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.

scholarly journals Objective-Prism Surveys of the Galaxy

1994 ◽  
Vol 161 ◽  
pp. 467-469 ◽  
Author(s):  
O. Kurtanidze ◽  
M. Nikolashvili
Keyword(s):  
Milky Way ◽  
Late Type ◽  
The Galaxy ◽  
Objective Prism ◽  
Low Dispersion

The main sources of data for low dispersion objective-prism surveys of the Milky Way undertaken in the last fifteen years for the study of the distribution of late type stars, namely M and C stars, are summarized in Table 1.

scholarly journals Radial velocities of early-type stars

1970 ◽  
Vol 38 ◽  
pp. 290-290
Author(s):  
J. P. Kaufmann
Keyword(s):  
Velocity Gradient ◽  
Milky Way ◽  
Radial Velocities ◽  
Circular Motion ◽  
The Sun ◽  
Spectral Classification ◽  
Early Type ◽  
Objective Prism ◽  
Minimum Distances ◽  
Early Type Stars

With the Fehrenbach objective prism radial velocities of about 700 stars of type B0 to A0 were determined in two fields of the Southern Milky Way (lII = 295° bII = −0.6°; lII = 320° bII = −2.5°), with a mean error of ±20 km s−1. An additional photographic UBV-photometry with plates of the ADH-telescope at Boyden Observatory was accomplished. Minimum distances for the stars resulted from absorption-corrected magnitudes and a MK-spectral classification. About 200 stars lay at distances greater than 1.5 kpc from the sun. The largest distances determined were 5 kpc. From the radial velocities and distances circular velocities were derived and plotted against galactocentric distances R. Even within the possible error limits a positive velocity gradient showed up in the range 8 kpc < R < 9.5 kpc, which French authors had already found for the region 10.5 kpc < R < 12.5 kpc. If there do not exist significant deviations from circular motion for these stars, a conformity with Schmidt's 1965 model cannot be obtained.

scholarly journals Hamburg Observatory Northern Milky Way Spectral Survey For Emission Objects

1984 ◽  
Vol 78 ◽  
pp. 311-314
Author(s):  
L. Kohoutek
Keyword(s):  
Emission Line ◽  
Milky Way ◽  
Planetary Nebulae ◽  
H Ii Region ◽  
Objective Prism ◽  
Protoplanetary Nebula ◽  
Spectral Survey ◽  
Individual Objects

Objective-prism spectral surveys open the possibility to search for faint emission-line objects with the aim to complete their statistics and to pick out most interesting individual objects for further study. In the years 1964 - 1970 the Hamburg Hα Spectral Survey of the Northern Milky Way was accomplished using the Schmidt camera (80/120 cm, f= 240 cm) in Bergedorf with the following parameters: area 1 32° - 214°, -10°<b<+10°, 160 fields. Kodak 103aE + RG1, exp. 60min, widen. 10", 4° prism (580 Å/mm at Hγ ). As a main result the list of about 140 faint objects classified as planetary nebulae or possible planetary nebulae (Kohoutek,1965, 1969a,1972), and the identification of about 1500 new stars having Hα in emission (Kohoutek, Wehmeyer, in preparation) can be reported. The best known examples of this survey are K 3-50, a prototype of a compact H II region, and the symbiotic variable HBV 475 = V 1329 Cyg (Kohoutek, 1969b), which is also classified as a protoplanetary nebula.

scholarly journals A Deep Spectral Survey of Peculiar A-Type Stars

1995 ◽  
Vol 148 ◽  
pp. 353-356
Author(s):  
Omar M. Kurtanidze ◽  
Miriam G. Nikolashvili
Keyword(s):  
Milky Way ◽  
Early Stage ◽  
Star Clusters ◽  
Open Star Clusters ◽  
Nitrogen Gas ◽  
Open Star ◽  
Wide Range ◽  
Objective Prism ◽  
Spectral Survey

AbstractWe are conducting a long-term deep spectral survey to investigate the distribution of Ap and Am stars in selected fields of the Milky Way and in open star clusters of different ages. The spectral survey is based on objective prism spectra obtained with an eight degree prism attached to the 70/98 cm meniscus telescope (f/3, 135 Å mm−1 at Hδ) at the Abastumani Observatory. Kodak IIIa-J emulsions hypersensitized by baking in nitrogen gas are used in combination with a 500 Å FWHM filter centered on Hδ. A limiting magnitude of mB = 14 was reached in an exposure time of 120 m. Study of the objective prism plates is still in a very early stage. Observations of the central part of the same field taken with a CCD resulted in a limiting magnitude mB = 16. On the basis of spectral material obtained, a wide range of spectra may be classified in the MK system.

scholarly journals A Deep Visual-Red and Near Infrared Objective Prism Spectral Survey of the Milky Way

1989 ◽  
Vol 106 ◽  
pp. 63-63 ◽  
Author(s):  
O.M. Kurtanidze ◽  
M.G. Nikolashvili
Keyword(s):  
Near Infrared ◽  
Milky Way ◽  
Objective Prism ◽  
Spectral Survey ◽  
Low Dispersion

The deep visual-red and near infrared low dispersion (1250 Å/mm at Hɤ and 7000 A/mm at Å band) objective prism spectral survey of the Milky Way equatorial ten degree belt has been done by 70 cm meniscus telescope equipped with 2° prism (30° < 1 < 115° infrared).

scholarly journals An atlas of cool supergiants from the Magellanic Clouds and typical interlopers

2018 ◽  
Vol 618 ◽  
pp. A137 ◽  
Author(s):  
Ricardo Dorda ◽  
Ignacio Negueruela ◽  
Carlos González-Fernández ◽  
Amparo Marco
Keyword(s):  
Photographic Plate ◽  
Magellanic Clouds ◽  
Spectral Classification ◽  
Late Type ◽  
Spectral Ranges ◽  
Work Done

We present an atlas composed of more than 1500 spectra of late-type stars (spectral types from G to M) observed simultaneously in the optical and calcium triplet spectral ranges. These spectra were obtained as part of a survey to search for cool supergiants in the Magellanic Clouds and were taken over four epochs. We provide the spectral and luminosity classification for each spectrum (71% are supergiants, 13% are giants or luminous giants, 4% are carbon or S stars, and the remaining 12% are foreground stars of lesser luminosities). We also provide a detailed guide for the spectral classification of luminous late-type stars, the result of the extensive classification work done for the atlas. Although this guide is based on classical criteria, we have put them together and re-elaborated them for modern CCD-spectra as these criteria were scattered among many different works and mainly conceived for use with photographic plate spectra. The result is a systematic, well-tested process for identifying and classifying luminous late-type stars, illustrated with CCD spectra of standard stars and the classifications of our own catalogue.

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