Washed/replaced (W/R)-platelets

Long - term photometry of the Wolf - Rayet stars WR 137 , WR 140 , WR 148 , and WR 153 ⋆

In 1991, a long term UBV -photometry campaign of four Wolf-Rayet stars was started using the 60 cm telescope of the National Astronomical Observatory Rozhen, Bulgaria. Here we report on our observational results and discuss the light variations. The star WR137 was observed during 1991 1998. No indications of eclipses were found, though random light variations with small amplitudes exist, which ...

Stellar wind bubbles around WR and [WR] stars

We study the dynamics of stellar wind bubbles around hydrogen-deficient stars using numerical simulations with timeand ion dependent cooling. We consider two types of hydrogen-deficient stars, massive WR stars, producing Ring Nebulae, and low mass [WR] stars, producing Planetary Nebulae. We show that for the Planetary Nebulae, the different cooling properties of the hydrogen-deficient wind lead...

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In this paper, I present a solution to the Doomsday argument (DA, for short) based on a third type of solution, by contrast to on the one hand, the Carter-Leslie view and on the other hand, the EckhardtSowers-Sober analysis. The present line of thought is based on the fact that both aforementioned analyses are based on an inaccurate analogy. After discussing the imperfections of both models, I ...

Determination of WR-1065 and WR-33278 by liquid chromatography with electrochemical detection.

A liquid chromatographic method using electrochemical detection is presented for measuring the thiol WR-1065 12-(3-aminopropylamino) ethanethiol] and its symmetrical disulfide WR-33278 [NH2(CH2)3NHCH2CH2S]2. WR- 1065 is the active, radioprotective drug derived from the phosphorothioate pro-drug WR-2721 (amifostine). External standard curves for both compounds were linear over the range of 40-20...

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