|The Fast Apsidal Motion System NSV 18773|
Combination of the publicly available ASAS-2 Ic and ASAS-3 V data showsthat NSV 18773 is an eclipsing binary showing fast apsidal motion.
|Aus den IBVS 5680, 5682, 5684, 5690, 5694, 5681, 5685, 5686, 5687, 5688, 5689, 5692, 5695, 5696, 5697, 5698.|
|Photometric elements and apsidal motion of the eclipsing binary NSV 18773.|
|Observations of OB-stars at the former Leiden Southern Station|
About 700 stars, mostly OB-stars, were observed by the author at theformer Leiden Southern Station at Hartebeespoortdam, South Africa, inthe observing seasons 1965, 1968, 1969, 1974, 1977, 1978. Observationswere made in the five channels of the Walraven photometric system. Dueto weathering of the telescope mirror the W channel gave no reliableresults for the faintest stars (m = 11 mag); in these cases the U-Wcolour index is not given. The change in sensitivity in the V channel,supposedly having occurred in 1968, was not recognised. Table~5 is onlyavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (126.96.36.199) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/369/527
|Deep Hα survey of the Milky Way. V. The l=289o to 295o area|
An Hα study of the ionized hydrogen in the Galactic planedirection l = 290o has been undertaken. We describe anddiscuss the characteristics of the numerous filaments and emissionpatches observed. These appear linked to a major expanding HI bubble orshell over an area of several degrees. Thanks to morphological,kinematical and stellar distance considerations we have linked observedHII regions and molecular clouds into star-forming complexes whichmainly trace the Carina arm. We show particularly that the HII regionsGum35 (G289.8-1.3), Gum38b (G291.6-0.5, NGC 3603) and Hf 58 (G291.9-0.7)can be directly linked to the farthest complexes at a distance `d' of 8and 9 kpc, while HII regions Gum37 (G290.6+0.3), Gum38a (G291.3-0.7) andthe expanding shell can be linked to the closest complexes locatedbetween 2.6 and 2.9 kpc. Important internal motions have been identifiedin the Gum35, Gum37, Gum38a and Gum38b HII regions. The identificationand analysis of these motions are essential for a good systemic velocitydetermination. We have also identified and delineated that part of theGalactic plane exhibiting velocity departures of Delta Theta = 7 kms-1 (between 285o and 295o and d = 2.5and 3 kpc). Based on observations collected at the European SouthernObservatory.}
|UBV polarimetry of 361 A- and F-type stars in selected areas|
We present simultaneous UBV linear polarization measurements for 361 A-and F-type stars with accurate colour excess and distance determination.These stars are distributed in 35 Kapteyn's Selected Areas, covering thethird and fourth quadrants of the galactic plane (|b| <= 30degr ).The obtained polarization and the known colour excess are compared. Ananalysis of the polarization distribution as a function of the stellardistance is also performed. Based on observations collected at theEuropean Southern Observatory (ESO), La Silla, Chile.
|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.
|A Radial Velocity Database for Stephenson-Sanduleak Southern Luminous Stars|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1997AJ....113..823R&db_key=AST
|A spectroscopic database for Stephenson-Sanduleak Southern Luminous Stars|
A database of published spectral classifications for objects in theStepenson-Sanduleak Luminous Stars in the Southern Milky Way catalog hasbeen compiled from the literature. A total of 6182 classifications for2562 stars from 139 sources are incorporated.
|Stromgren and H-Beta Photometry of Associations and Open Clusters - Part Three - CENTAURUS-OB1 and CRUX-OB1|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1994MNRAS.269..289K&db_key=AST
|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.
|A catalog of ultraviolet interstellar extinction excesses for 1415 stars|
Ultraviolet interstellar extinction excesses are presented for 1415stars with spectral types B7 and earlier. The excesses with respect to Vare derived from Astronomical Netherlands Satellite (ANS) 5-channel UVphotometry at central wavelengths of approximately 1550, 1800, 2500, and3300 A. A measure of the excess extinction in the 2200-A extinction bumpis also given. The data are valuable for investigating the systematicsof peculiar interstellar extinction and for studying the character of UVinterstellar extinction in the general direction of stars for which theextinction-curve shape is unknown.
|O-B2-STARS with Large Circumstellar Obscuration|
|Exciting stars and the distances of the diffuse nebulae|
|Intrinsic UV colour indices of early-type stars|
Intrinsic UV colors of the early-type stars have been determined using anew method based on the assumption that there is a linear correlationbetween UV color excesses and E(B-V). This method makes it possible toinclude all stars with available photometry independent of reddening.Results derived from ANS photometric data are presented. These includeintrinsic UV colors covering all ANS photometric bands for spectraltypes O6-AO. It is also shown that this method, based on perfectcorrelation between UV and visual extinction, fails for the shortwavelength color index CI(1550 A-1800 A).
|Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978ApJS...38..309H&db_key=AST
|The spiral structure of our Galaxy determined from H II regions|
An attempt is made to establish a coherent scheme of the spiralstructure of the Galaxy on the basis of a study of H II regions andtheir exciting stars. The data used for this include the distances ofthe exciting stars, H-alpha radial velocities, and H109-alpha radialvelocities. A detailed model of galactic rotation is developed whichexhibits deviations from circular motion in certain sectors, thusallowing the stellar and kinematic distances to be matched correctly.The resulting spiral pattern is found to have two symmetrical pairs ofarms (four altogether) with a pitch angle of 12 deg. These areidentified as the Sagittarius-Carina Arm (the major arm or arm No. 1),the Scutum-Crux Arm (the intermediate arm or arm No. 2), the Norma Arm(the internal arm or arm No. 1'), and the Perseus Arm (the external armor arm No. 2'). It is concluded that the morphological type of theGalaxy is much closer to Sc than to Sb.
|A supplementary list of southern O stars|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...16..323T&db_key=AST
|The H gamma-absolute magnitude calibration.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974MNRAS.166..203B&db_key=AST
|Spectroscopic observations of stars in HII regions.|
|A new general O type stars catalogue|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS...12..277G&db_key=AST
|Structure and motions in the CAR spiral feature.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&A....20...29H&db_key=AST
|Radial velocities of southern B stars determined at the Radcliffe observatory 6.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.158...85C&db_key=AST
|Observations of stars in HII regions : spectral classification and UBVphotometry.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971AJ.....76..260C&db_key=AST
|A catalogue of faint OB stars between Carina and Centaurus|
|A survey of southern HII regions.|