HISTORIOGRAPHY OF SCIENTIFIC COMMUNICATIONS IN THE FIELD OF MEMORY AND BLOOD-BRAIN BARRIER

A scientometric study after author's own methods (Tomov, 1986 and 1998) of the publication output in the field ofmemory and blood-brain barrier in MEDLINE on CD-ROM (EBSCO Publ., USA) data base for 1965-2000 was carried out. On this interdisciplinary topic, a total of 126 articles in seven languages, mainly in English, had been published in a total of 93 journals from 21 countries. In 37 review articles there were 5289 references (at an average of 143 references per paper). Authors' institutions belonged to 18 mono- and 7 interdisciplinary thematic profiles while the journals could be assigned to 17 mono- and 8 interdisciplinary profiles. Some 39 journals from 12 countries containing 57 articles belonged to the generalized profile of neurosciences. The authors from the USA had published 37 papers in 30 American journals but 16 ones in 10 journals from 5 countries. Aa a whole, 67 papers had been published in domestic journals but 59 ones in foreign journals. Eight articles by authors from 6 countries had been published in 7 "international" journals from 5 countries. The computerized historiography of science could be successfully applied for scientometric purposes and for perfection of science policy and management at any levels in small countries like Bulgaria

H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability

We report 138 spectral observations of the H-alpha emission line of the radio- and gamma-ray-emitting Be/X-ray binary LSI+61303 obtained during the period of September 1998 -- January 2013. From measuring various H-alpha parameters, we found that the orbital modulation of the H-alpha is best visible in the equivalent width ratio EW(B)/EW(R), the equivalent width of the blue hump, and in the radial velocity of the central dip. The periodogram analysis confirmed that the H-alpha emission is modulated with the orbital and superorbital periods. For the past 20 years the radius of the circumstellar disk is similar to the Roche lobe size at the periastron. It is probably truncated by a 6:1 resonance. The orbital maximum of the equivalent width of H-alpha emission peaks after the periastron and coincides on average with the X-ray and gamma-ray maxima. All the spectra are available upon request from the authors and through the CDS.Comment: 11 pages, accepted for publication in A&

H-alpha variability of the recurrent nova T Coronae Borealis

We analyze H-alpha observations of the recurrent nova T CrB obtained during the last decade. For the first time the H-alpha emission profile is analyzed after subtraction of the red giant contribution. Based on our new radial velocity measurements of the H-alpha emission line we estimate the component masses of T CrB. It is found that the hot component is most likely a massive white dwarf. We estimate the inclination and the component masses to be i~67 deg, Mwd = 1.37 +/-0.13 Msun and Msec=1.12 +/-0.23 Msun, respectively. The radial velocity of the central dip in the H-alpha profile changes nearly in phase with that of the red giant's absorption lines. This suggests that the dip is most likely produced by absorption in the giant's wind. Our observations cover an interval when the H-alpha and the U-band flux vary by a factor of ~6, while the variability in B and V is much smaller. Based on our observations, and archival ultraviolet and optical data we show that the optical, ultraviolet and H-alpha fluxes strongly correlate. We argue that the presence of an accretion disc can account for most of the observed properties of T CrB.Comment: 8 pages, 6 EPS figures, to appear in A&