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 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 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 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 A Low-Dispersion, Near-Infrared Survey for Galactic M Supergiants

1986 ◽  
Vol 116 ◽  
pp. 123-124
Author(s):  
D. J. MacConnell ◽  
R. F. Wing ◽  
E. Costa
Keyword(s):  
Interstellar Dust ◽  
Near Infrared ◽  
Galactic Plane ◽  
Galactocentric Distance ◽  
The Galaxy ◽  
Red Supergiants ◽  
Objective Prism ◽  
Low Dispersion ◽  
Infrared Survey

While there have been many surveys for luminous, blue galactic stars and their numbers can be considered somewhat complete, such is not the case for red supergiants (see e.g. Humphreys and McElroy 1984). One result of this incompleteness is that the ratios B/R and WR/R, often used as diagnostics for evolutionary models of massive stars and the variation of the ratios with galactocentric distance, are not well known for the Galaxy. In an attempt to improve the statistics, the first author began an objective-prism survey within 6 deg of the southern galactic plane using I-N plates. The dispersion is 3400 A/mm at the A-band, and the spectra cover the range 6800–8800 A; the deepest plates reach ir mag ∼13. The detection of possible M supergiants on such plates was first discussed by Nassau, et al. (1954) and depends on the presence of TiO at 7054 A and a spectrum sharply tapered to the blue. For supergiants, this shape results from integration of interstellar dust over a long path-length, but any sample of red stars with tapered spectra contains M giants in heavily-obscured regions and S stars; thus follow-up observations of the candidate stars are necessary.

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.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

scholarly journals Structure and dynamics of the Milky Way disk as revealed from the radial velocity distributions of APOGEE red clump stars

2016 ◽  
Vol 11 (S321) ◽  
pp. 50-50
Author(s):  
Daisuke Toyouchi ◽  
Masashi Chiba
Keyword(s):  
Near Infrared ◽  
Milky Way ◽  
Radial Velocities ◽  
Galactocentric Distance ◽  
Chemical Abundances ◽  
Structure And Dynamics ◽  
Evolution Experiment ◽  
Dynamical Properties ◽  
Red Clump ◽  
Independent Work

AbstractWe investigate the structure and dynamics of the Milky Way (MW) disk stars based on the analysis of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) data, to infer the past evolution histories of the MW disk component(s) possibly affected by radial migration and/or satellite accretions. APOGEE is the first near-infrared spectroscopic survey for a large number of the MW disk stars, providing their radial velocities and chemical abundances without significant dust extinction effects. We here adopt red-clump (RC) stars (Bovy et al. 2014), for which the distances from the Sun are determined precisely, and analyze their radial velocities and chemical abundances in the MW disk regions covering from the Galactocentric distance, R, of 5 kpc to 14 kpc. We investigate their dynamical properties, such as mean rotational velocities, 〈Vφ〉 and velocity dispersions, as a function of R, based on the MCMC Bayesian method. We find that at all radii, the dynamics of alpha-poor stars, which are candidates of young disk stars, is much different from that of alpha-rich stars, which are candidates of old disk stars. We find that our Jeans analysis for our sample stars reveals characteristic spatial and dynamical properties of the MW disk, which are generally in agreement with the recent independent work by Bovy et al. (2015) but with a different method from ours.

scholarly journals VVV DR1: The first data release of the Milky Way bulge and southern plane from the near-infrared ESO public survey VISTA variables in the Vía Láctea

2012 ◽  
Vol 537 ◽  
pp. A107 ◽  
Author(s):  
R. K. Saito ◽  
M. Hempel ◽  
D. Minniti ◽  
P. W. Lucas ◽  
M. Rejkuba ◽  
...  
Keyword(s):  
Near Infrared ◽  
Milky Way ◽  
Public Survey ◽  
Data Release
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