0000000000131744

AUTHOR

Raivis Spēlmanis

showing 2 related works from this author

A search for diffuse absorption bands in carbon-rich stars -- I. Barium and related stars

2003

The results of a search for interstellar and circumstellar absorption lines in high-resolution optical spectra of seven late-type stars are presented. All these stars are single-lined spectroscopic binaries with unseen companions, presumably white dwarfs. Some residual material indicative of recent mass transfer from an asymptotic giant branch (AGB) star might still be associated with the systems. Peculiar energy distribution and the sodium D 1 and D 2 lines give direct evidence about the material in the line of sight in some cases. Absorption features of simple carbon-bearing molecules (C 2 , CN) have been detected in most of the examined stars, confirming a carbon-rich nature of the corre…

PhysicsLine-of-sightAbsorption spectroscopyDirect evidenceK-type main-sequence starAstronomyWhite dwarfAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsStarsSpace and Planetary ScienceAstrophysics::Solar and Stellar AstrophysicsAsymptotic giant branchAstrophysics::Earth and Planetary AstrophysicsAbsorption (electromagnetic radiation)Astrophysics::Galaxy AstrophysicsMonthly Notices of the Royal Astronomical Society
researchProduct

CIT 6: The Early Phase of PPN?

2001

Photometric and spectroscopic studies for one of the early phase candidate for proto-planetary nebulae, the dust enshrouded extreme carbon star CIT 6, are presented.

PhysicsAstrophysics::Solar and Stellar AstrophysicsAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysicsEarly phaseStellar evolutionAstrophysics::Galaxy AstrophysicsCarbon starProtoplanetary nebula
researchProduct