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 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 A Survey of Planetary Nebulae in the SMC and M31

1989 ◽  
Vol 131 ◽  
pp. 351-351
Author(s):  
N. Meyssonnier ◽  
M. Azzopardi ◽  
J. Lequeux ◽  
R. Gathier
Keyword(s):  
Emission Line ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Objective Prism ◽  
Low Dispersion ◽  
Selection Of ◽  
General Method

Our general method for finding planetary nebulae (PN) is to make wide field objective-prism or objective-grating low-dispersion spectra on photographic plates, PN stand up amongst other emission-line objects either as Hα + [N II] 6548-6583 A emitters or as [O III] 50007 A emitters with faint or no continuum, higher-resolution spectroscopy is used for confirming a selection of candidates.

scholarly journals The Absolute Spectrophotometry of 170 Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 55-58 ◽  
Author(s):  
B.A. Vorontsov-Velyaminov ◽  
E.B. Kostjakova ◽  
O.D. Dokuchaeva ◽  
V.P. Arhipova
Keyword(s):  
Emission Line ◽  
Planetary Nebulae ◽  
Homogeneous System ◽  
Astronomical Institute ◽  
Line Intensities ◽  
Objective Prism ◽  
The Absolute

An investigation of planetary nebulae has been underway at the Sternberg State Astronomical Institute in Moscow for several years. It was begun with the measurement of the emission-line intensities of planetary nebulae in an homogeneous system in absolute units. More than 300 long-exposure objective prism spectrograms were obtained with the 50-cm Maksutov telescope at the Crimean Station of the Institute and with the 70-cm meniscus telescope of the Abastumani Observatory. The dispersion of the spectrograms was 190 and 160 Å/mm at Hγ respectively.

scholarly journals Lists of Confirmed Planetary Nebulae in the Magellanic Clouds

1978 ◽  
Vol 76 ◽  
pp. 64-64
Author(s):  
N. Sanduleak ◽  
D.J. MacConnell ◽  
A.G. Davis Philip
Keyword(s):  
Emission Line ◽  
Total Mass ◽  
Planetary Nebulae ◽  
High Sensitivity ◽  
Hii Regions ◽  
Magellanic Clouds ◽  
Schmidt Telescope ◽  
Deep Blue ◽  
Two Systems ◽  
Objective Prism

Very deep, blue and red-sensitive objective-prism plates, taken with the Curtis Schmidt telescope at the Cerro Tololo Inter-American Observatory, were used to survey both Magellanic Clouds for unresolved objects which could be classified as highly probable planetary nebulae. The high sensitivity of the baked Kodak IIIa-J emulsion at 5000 Å made it possible to detect the N1 and N2 lines of [OIII] in fainter objects than previously observed. A number of emission-line stars, compact HII regions, and very-low-excitation objects, formerly considered to be probable or possible planetaries, were recognized and excluded. The final lists contain 27 confirmed planetaries in the SMC and 100 in the LMC, a ratio equivalent to the estimated ratio of total mass in the two systems. As would be expected, most of these objects had been detected in previous objective-prism surveys but some apparently new planetaries were found.

scholarly journals Kinematics and dynamics of galactic Planetary Nebulae

1997 ◽  
Vol 180 ◽  
pp. 407-407
Author(s):  
S. Durand
Keyword(s):  
Emission Line ◽  
Milky Way ◽  
Large Range ◽  
Planetary Nebulae ◽  
The Other ◽  
Initial Mass ◽  
Kinematics And Dynamics ◽  
Astrophysical Interest ◽  
Bright Emission ◽  
Bright Emission Line

Planetary Nebulae (PNe) are transient objects of considerable astrophysical interest: there are thought to descend from low and intermediate initial mass stars and therefore cover a large range of ages. On the other hand there are easily identified thanks to their bright emission-line spectra. In view of this it is perhaps surprising that little use has been made of PNe for kinematical studies of the Milky Way.

scholarly journals Surveys for Hα Emission-Line Stars using the Bosscha Schmidt Telescope

1995 ◽  
Vol 148 ◽  
pp. 388-394
Author(s):  
Bambang Hidayat ◽  
Katsuo Ogura ◽  
Masao Shinohara
Keyword(s):  
Emission Line ◽  
Planetary Nebulae ◽  
T Tauri Stars ◽  
Schmidt Telescope ◽  
Dark Clouds ◽  
T Tauri ◽  
Hα Emission ◽  
Objective Prism ◽  
Emission Stars

According to McCarthy (1984) the objects detected in objective prism surveys for Hα emission line are a ”most unnatural“ group. Of course they consist of many natural groupings whose identities or other peculiarities could become apparent after observing them with higher dispersion and resolution spectroscopy. In some cases, however, their galactic locations and associations with other known populations, can provide a clue to their population types.The aims of the objective prism surveys using the Bosscha Schmidt telescope can be broadly categorised as follows: 1.Searches for galactic planetary nebulae in the region 240° < l < 360 °; |b| ≤ 10°, initiated by The (1968).2.Searches for T-Tauri stars in some southern dark clouds (Shinohara, Ogura & Hidayat 1989).3.Searches for variations in Hα intensities and luminous emission stars in some selected galactic regions, such as in the Puppis and Carina regions.

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 Peculiar Central Stars and Related Objects

1978 ◽  
Vol 76 ◽  
pp. 212-212
Author(s):  
Julie Lutz
Keyword(s):  
Emission Line ◽  
Absorption Spectra ◽  
Planetary Nebulae ◽  
Symbiotic Stars ◽  
Be Stars ◽  
Phase 3 ◽  
Emission Line Spectrum ◽  
Protoplanetary Nebula ◽  
Astronomy And Astrophysics ◽  
Central Stars

Results are presented of a spectroscopic survey of sixteen peculiar central stars (i.e., central stars which have absorption spectra and continuua which are too cool to account for the superimposed emission line spectrum). Classifications on the MK system are presented for the absorption spectra. Intensities relative to H are presented for some of the strongest emission lines. The relationships between peculiar central stars and other types of emission line objects such as Be stars, symbiotic stars and P Cygni stars will be discussed. Three interpretations for peculiar central stars will be considered: 1) Some of them are binary nuclei of planetary nebulae, 2) Some of them are manifestations of the protoplanetary nebula phase, 3) Some of them are not related to planetary nebulae. (Paper will appear in Astronomy and Astrophysics.)

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.

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