MARC details
| 000 -LEADER |
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| fixed length control field |
04968nam a2200253Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
IN-BaIIA |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20211110155313.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
211028s9999 xx 000 0 eng d |
| 040 ## - CATALOGING SOURCE |
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| Transcribing agency |
IIA Library |
| 080 ## - UNIVERSAL DECIMAL CLASSIFICATION NUMBER |
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| Universal Decimal Classification number |
043:52 |
| Item number |
BAB |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Babu, G S D |
| 9 (RLIN) |
14868 |
| Relator term |
Author |
| 245 #4 - TITLE STATEMENT |
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| Title |
The study of faint galactic open clusters |
| Statement of responsibility, etc. |
G S D Babu |
| Medium |
[Ph.D Thesis] |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. |
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| Place of publication, distribution, etc. |
Bangalore, |
| Name of publisher, distributor, etc. |
Indian Institute of Astrophysics |
| Date of publication, distribution, etc. |
1985 |
| 300 ## - PHYSICAL DESCRIPTION |
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| Extent |
240p. |
| 502 ## - DISSERTATION NOTE |
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| Degree type |
Doctor of Philosophy |
| Name of granting institution |
Indian Institute of Astrophysics, Bangalore |
| Year degree granted |
1985 |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
The topic of this thesis was originally suggested by<br/>Late Prof. M. K. V. Bappu and was undertaken with two major aims.<br/>The first was to obtain the luminosities of stars contained<br/>in the very distant and hitherto not well-studied clusters.<br/>The second aim was to use the younger of these clusters as<br/>spiral arm tracers to substantiate the existing optical picture<br/>of our Galaxy's spiral structure. In this thesis, the portion<br/>covered was restricted to the anticenter direction of the Galaxy<br/>(1600 < gal. long. < 2800 ) so th at an attempt may be made to<br/>optically study the remotest galactic parts. This is made<br/>slightly easier because in this direction, the complications<br/>due to the effects of interstellar extinction are less than<br/>those in the direction of the galactic center.<br/>As the first step, one hundred and four not well-studied<br/>clusters were chosen from the catalogue of open clusters ; n<br/>the given range of galactic longitudes. Then thirty two of<br/>them were observed with the modified objective grating method<br/>(Hoag & Schroeder, 1970), so as to get an approximate estimate<br/>of spectral types of the individual stars in each cluster region.<br/>These spectral types were combined with their respective visual<br/>magnitudes determined from the image sizes on the already existing<br/>sky survey charts, to construct the approximate HR-diagram<br/>of each cluster. Out of them, six were found to have stars<br/>of spectral type B3 or earlier on the respective main-sequence<br/>bands and were categorised as young. Six more bluer clusters were selected based on the visual inspection of the blue and<br/>red prints of the sky survey charts.<br/>All these twe lve clusters were photometrically observed<br/>using the facilities at Kavalur Observatory in India and at<br/>Siding Spring Observatory in Australia. In general, the stars which<br/>appeared to be members, out of the observed ones, in each of<br/>the programme clusters, ,have been found to be in the range<br/>of 10 to 30, with one exception, for which 55 members have<br/>been counted.<br/>Each one of these clusters is found to be showing some<br/>amount of luminosity spread, which is mainly caused by stars<br/>of differing ages, supporting the earlier suggestion that star<br/>formation in clusters is not coeval.<br/>range of 6.0 x 106 to 5.9 x 108 years.<br/>The ranges are in the<br/>Their distances are found to be ranging from 0.6 kpc<br/>to 7.1kpc and their colour excesses, E(B-V), are in the range<br/>of 0.00 mag to 1.20 mag. It is clearly seen from the present<br/>work that as the cluster distance increases, the value of<br/>E(B-V) increases. That is, the amount of interstellar matter<br/>increases in the line of sight column with the increasing distance<br/>from the Sun ;n the plane of the Galaxy.<br/>Out of the twelve clusters studied here, four are located<br/>along the Cygnus-Orion arm and onecs a definite member of the<br/>Sagittarius-Carina arm. The existence of the outer Peruses<br/>spiral feature is substantiated by four clusters at distances<br/>of about 4 to 5.S kpc in the direction of the galactic longitude 170° to 220°, some evidence for which was found earlier by<br/>Moffat & Vogt (1973). There is a clear indication that this<br/>outer feature is probably extending into the Puppis group of<br/>clusters which seems to be the junction for the merging of<br/>the loc a 1 arm with the outer Peruse arm. Thisis supported<br/>by one of the presently studied clusters which is located at<br/>a distance of about 6.5 kpc in the galactic longitude of about<br/>245° ,<br/>There is an indication of a feature which is originating<br/>from the Orion-Cygnus arm at a distance of about 4.5 kpc and<br/>extending upto a distance of about 8 kpc towards the galactic<br/>longitude of 280°, This inference is based on the location<br/>of one of the programme clusters at a distance of about 7 kpc<br/>in the direction of galactic longitude 2700 along with two<br/>other already known clusters in the same area. Even though<br/>there is some suggestion of this branching off feature from<br/>the radio studies, this is perhaps its first indication from<br/>the optical observations.<br/> |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Astronomy and Astrophysics Thesaurus |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Clusters of Galaxies |
| 9 (RLIN) |
13374 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Open Clusters |
| 9 (RLIN) |
12645 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Ph.D Thesis |
| 9 (RLIN) |
1344 |
| 700 ## - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
J. C. Bhattacharyya |
| Relator term |
Supervisor |
| 9 (RLIN) |
48845 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS |
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| Link text |
Click Here to Access eThesis |
| Uniform Resource Identifier |
<a href="http://prints.iiap.res.in/handle/2248/103">http://prints.iiap.res.in/handle/2248/103</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Koha item type |
Thesis & Dissertations |
| Source of classification or shelving scheme |
Universal Decimal Classification |
