Studies of pulsating carbon stars (Record no. 14478)

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003 - CONTROL NUMBER IDENTIFIER
control field IN-BaIIA
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20211110161011.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
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040 ## - CATALOGING SOURCE
Transcribing agency IIA Library
080 ## - UNIVERSAL DECIMAL CLASSIFICATION NUMBER
Universal Decimal Classification number 043:52
Item number RAV
100 ## - MAIN ENTRY--PERSONAL NAME
Personal name Raveendran, A. V
9 (RLIN) 16768
Relator term Author
245 #0 - TITLE STATEMENT
Title Studies of pulsating carbon stars
Remainder of title a thesis submitted for the degree of Doctor of Philosophy in the faculty of science, Bangalore University, Bangalore
Statement of responsibility, etc. A. V. Raveendran
Medium [Ph.D Thesis]
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Place of publication, distribution, etc. Bangalore
Date of publication, distribution, etc. 1989
300 ## - PHYSICAL DESCRIPTION
Extent ix, 193p.
500 ## - GENERAL NOTE
General note Thesis Supervisor N. K. Rao
502 ## - DISSERTATION NOTE
Degree type Doctor of Philosophy
Name of granting institution Indian Institute of Astrophysics, Bangalore
Year degree granted 1989
520 ## - SUMMARY, ETC.
Summary, etc. The present work was begun with the goal of understanding the formation and properties of circumstellar dust envelopes around carbon-rich objects, especially those belonging to the RV Tauri group of variables. A study of dust envelopes would provide valuable information not only on the mass loss from the objects but also on the nature of interstellar grains because of their probable origin in circumstellar envelopes. Both multiwavelength polarimetry and infrared photometry serve as the most useful observational tools for such an investigation. <br/>The thesis essentially contains, ( i) broadband multiwavelength (UBVRI) polarimetry of a sample of carbon-rich objects belonging to the different variability types cepheids, RV Tauri stars and red variables - and its analysis, (ii) extensive two color (BV) photometry of the RV Tauri star AR Pup, (iii) an interpretation of the Infra Red Astronomy Satellite data of RV Tauri stars, and (iv) a discussion of some theoretical aspects of polarization produced by circumstellar dust envelopes. It has been divided into six chapters and each into several sections and subsections.<br/>In the first chapter observational characteristics brief of the descriptions of the different variability classes are given. Short accounts of the mechanisms which cause the instabilities and the mass loss observed in these objects are also presented. The instrumentation used for the observations, and the method of observations and data reduction are discussed in the second and third chapters, respectively.<br/>The data, analysis and results are presented in the fourth chapter which has two parts; part A deals with the cepheids and RV Tauri stars, and part B with the red carbon stars. The list of programme stars for polarimetry contained 2 carbon cepheids (RU Cam and V553 Cen) , 4 carbon RV Tauri stars (AR Pup, RU Cen, SX Cen and AC Her) and 12 red carbon stars (VX And, UU Aur, T Cae, Y CVn, U Hya, Y Hya, R Lep, RY Mon, W Ori, Y Per, RT Pup and X Vel). Out of these objects, polarimetric observations have been reported in the literature only for RU Cam, AC Her, R Lep, Y CVn, Y Per, W Ori and Y Hya, and except for R Lep, multiwavelength observations have been reported for none of them. A considerable part of the available 102-cm telescope time was devoted to observe AR Pup since it was found to show exceptionally large and highly time dependent polarization. The amplitude of polarization in U band was found to be -14.6%, the highest ever observed in any late-type star.<br/>The IRAS Point Source Catalogue, which gives the fluxes at far Infrared wavelengths - 12, 25, 60 and 100~m - provides a good database for a systematic study of the composition and formation of circumstellar dust; an interpretation of the IRAS data on RV Tauri stars is presented in the fifth chapter. In the same chapter a discussion of the possible polarization mechanisms operating in the objects considered, and a few computational polarization models of circumstellar envelope using Mie theory under single scattering approximation are also presented.<br/> Finally, in the last chapter the conclusions are summarized, and the further investigations needed to answer some of the related problems are discussed.<br/>The equations, tables and figures are numbered sequentially in each chapter, and the corresponding chapter number is prefixed whenever a reference is made to them in any other chapter. The related publications and literature cited are listed at the end.<br/>
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element Carbon stars
9 (RLIN) 11641
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element Ph.D.Thesis
9 (RLIN) 1344
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element Pulsating Variable Stars
9 (RLIN) 1139
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element Stars
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name N. K. Rao
Relator term Supervisor
9 (RLIN) 48854
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="http://prints.iiap.res.in/handle/2248/140">http://prints.iiap.res.in/handle/2248/140</a>
Link text Click Here to Access eThesis
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Thesis & Dissertations
Source of classification or shelving scheme Universal Decimal Classification
Holdings
Withdrawn status Lost status Source of classification or shelving scheme Damaged status Not for loan Home library Current library Shelving location Date acquired Full call number Barcode Date last seen Price effective from Koha item type
    Universal Decimal Classification     IIA Library-Bangalore IIA Library-Bangalore General Stacks 13/02/2002 043:52/ RAV 15400 05/11/2021 13/02/2002 Thesis & Dissertations

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