عنوان

Hydrogen Deficient Stars and Related Objects :

9400947445

9789400947443

b593397

Hydrogen Deficient Stars and Related Objects :

[Book]

Proceeding of the 87th Colloquium of the International Astronomical Union Held at Mysore, India, 10-15 Nevember 1985.

Kurt Hunger

Dordrecht

Springer Netherlands

1986

(471 pages)

I. Introduction.- Introductory comments.- II. Basic Data.- Basic data on hydrogen-deficient stars (Review).- Radial velocities of extreme helium stars and of hot sdO stars.- III Hot Extreme Helium Stars.- Spectroscopic analyses of hot extreme helium stars (Review).- Photometric properties of the extreme helium stars (Review).- High resolution spectroscopy of six new extreme helium stars.- Emission lines in high resolution spectra of extreme helium stars.- The peculiar spectrum of the extreme helium star BD-9 Degrees4395.- Non-radial pulsations in the extreme helium star HD 160641.- The period of the extreme helium star BD +1 Degrees4381.- A preliminary analysis of the pulsating extreme helium star V 652 Her (BD +13 Degrees3224).- The radial velocity curve of V 652 Her (BD +13 Degrees3224).- The light curve of the pulsating extreme helium star BD +13 Degrees3224: further evidence of a decline in the period decrease rate.- IV Cool Hydrogen Deficient Stars.- The chemical composition of cool stars: II-the hydrogen deficient stars (Review).- The RCB stars and their circumstellar material (Review).- Polarimetric observations of hydrogen deficient stars.- Distribution of light minima of R Coronae Borealis type stars.- Abundance analysis of R CrB variable UW Cen.- Spectrophotometric observations of R CrB during 1972, 74 minima.- Photometric and radial velocity variations of R CrB near maximum light.- Preliminary analysis of the broad He I emission lines in R CrB.- 3.0 to 3.5 micron spectrum of V 348 Sgr and R CrB.- RY Sgr: Can the time of the next deep minimum be predicted?.- RY Sgr: Pulsation related phenomenon.- Anomalous UV-extinction and the effective temperature of V 348 Sgr.- On the mass and luminosity of V 348 Sgr.- The Large Magellanic Cloud R CrB star - HV 12842.- V Hydrogen Deficient Binaries.- Hydrogen-poor binary stars (Review).- Photometric and spectroscopic variability of the hydrogen-deficient binary CPD -58 Degrees2721.- Hydrogen deficiency in Algol secondaries.- VI Intermediate Helium Stars.- Intermediate helium stars: Atmospheric parameters, oblique rotators and shells (Review).- Magnetic fields and winds of the intermediate helium stars (Review).- Helium-rich stellar atmosphere models for B stars.- Analysis of the helium strong star HD 37017.- SB 939 - a new intermediate helium star at high galactic latitudes.- Spectral variations of the rapidly oscillating Ap star HD 60435.- VII Related Objects.- Helium rich subdwarf 0 stars and central stars of planetary nebulae (Review).- UV- and visual spectroscopy of nine extremely helium rich subluminous O-stars.- NLTE-analysis of three extremely helium-rich O-type subdwarfs.- Hydrogen deficient planetary nebulae: preliminary results.- The origin and evolution of helium-rich white dwarfs (Review).- Temperatures for hot and pulsating helium-rich (DB) white dwarfs obtained with the IUE observatory.- Line band profiles in the spectra of cool magnetic helium-rich white dwarfs.- Detection of an extremely active state of AM Canum Venaticorum.- VIII Iras - Results.- IRAS results for hydrogen deficient stars (Review).- IX Theory.- Pulsations of hydrogen deficient stars (Review).- Theory of dust formation in R Coronae Borealis stars (Review).- Diffusion and He overabundances: hydrodynamical implications (Review).- Evolutionary status and origin of extremely hydrogen-deficient stars (Review).- On the origin of helium rich stars.- Summary.- X Appendix.- J.S. Drilling, P.W. Hill: Appendix A: A catalogue of hydrogen-deficient stars.

Kurt Hunger

Detlef Schönberner

Kurt Hunger

N Kameswara Rao

[Book]

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