UBV beta Database for Case-Hamburg Northern and Southern Luminous Stars
A database of photoelectric UBV beta photometry for stars listed in theCase-Hamburg northern and southern Milky Way luminous stars surveys hasbeen compiled from the original research literature. Consisting of over16,000 observations of some 7300 stars from over 500 sources, thisdatabase constitutes the most complete compilation of such photometryavailable for intrinsically luminous stars around the Galactic plane.Over 5000 stars listed in the Case-Hamburg surveys still lackfundamental photometric data.
|
The interstellar 217 NM band - A third catalogue of equivalent widths
A catalog of equivalent widths of the 217 nm interstellar absorptionband as well as other parameters characterizing the extinction curve inthe ultraviolet has been compiled for 790 O and B stars. A relativelytight correlation between the equivalent width of the 217 nm band andE(B-V) indicates that the absorber of this band is connected with thepopulation of larger interstellar grains responsible for the visualextinction. The parameter characterizing the amount of extinction in thefar UV is only weakly correlated with E(B-V), a result in accord withthe assumption that a second population of very small grains causes therapid increase of the far-UV extinction.
|
ANS spectrophotometry - The bright X-ray binaries Hercules X-1 /HZ Herculis/ and Cygnus X-1 /HDE 226868/
Complete ultraviolet light curves for HZ Her immediately after awell-defined X-ray turn-on in 1975 are obtained. The features of thecurve are found to correspond well with features seen in the optical.The absolute level of emission at maximum light at 1550 A is in goodagreement with the calculations of the X-ray reflection effect ofMilgrom and Salpeter (1975). It is found that at 1550 A approximately20% of the light at maximum comes from the accretion disk. Similarobservations of Cyg X-1 make it possible to determine the degree ofreddening, equivalent to E(B-V) = 0.95 + or - 0.07, from the strength ofthe 2200 A interstellar absorption feature. The distance inferred fromthis amount of reddening requires that the optical star be luminous and,therefore, massive. Observations obtained during the May 1975 X-raytransition show ultraviolet excess when compared with the data obtainedsix months later.
|
Photoelectric measures of the 4430 A diffuse interstellar band
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963MNRAS.125..141W&db_key=AST
|
Interstellar Polarization of 405 Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1954ApJ...120..454H&db_key=AST
|
OB Stars in the P Cygni Region.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952ApJ...115..459N&db_key=AST
|
The Distribution of Extra-Galactic Nebulae
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1934ApJ....79....8H&db_key=AST
|
INHABITED SKY
