Catalogue of H-alpha emission stars in the Northern Milky Way
The ``Catalogue of Stars in the Northern Milky Way Having H-alpha inEmission" appears in Abhandlungen aus der Hamburger Sternwarte, Band XIin the year 1997. It contains 4174 stars, range {32degr <= l() II< 214degr , -10degr < b() II < +10degr } having the Hαline in emission. HBH stars and stars of further 99 lists taken from theliterature till the end of 1994 were included in the catalogue. We givethe cross-identification of stars from all lists used. The catalogue isalso available in the Centre de Données, Strasbourg ftp130.79.128.5 or http://cdsweb.u-strasbg.fr and at the HamburgObservatory via internet.
|
The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
|
Catalogue of stars in the northern Milky Way having H-alpha in emission
Not Available
|
On the nature of the AM phenomenon or on a stabilization and the tidal mixing in binaries. I. Orbital periods and rotation.
The paper casts a questioning eye on the unique role of the diffusiveparticle transport mechanism in explaining the Am phenomenon and arguesthat the so-called tidal effects might be of great importance incontrolling diffusion processes. A short period cutoff at =~1.2d as wellas a 180-800d gap were found in the orbital period distribution (OPD) ofAm binaries. The existence of the former can be ascribed to the state ofthe primaries with the almost-filled Roche lobes. The latter couldresult from the combined effects of the diffusion, tidal mixing andstabilization processes. Because the tidal mixing might surpassdiffusion in the binaries with the orbital periods P_orb_ less thanseveral hundred days and might thus sustain the He convection zone,which would otherwise disappear, no Am stars should lie below thisboundary. The fact that they are nevertheless seen there implies theexistence of some stabilization mechanism (as, e.g., that recentlyproposed by Tassoul & Tassoul 1992) for the binaries with orbitalperiods less than 180d. Further evidence is given to the fact that theOPD for the Am and the normal binaries with an A4-F1 primary arecomplementary to each other, from which it stems that Am stars are closeto the main sequence. There are, however, indications that they haveslightly larger radii (2.1-3 Rsun_) than expected for theirspectral type. The generally accepted rotational velocity cutoff at=~100km/s is shown to be of little value when applied on Am binaries ashere it is not a single quantity but, in fact, a function of P_orb_whose shape is strikingly similar to that of the curves of constantmetallicity as ascertained from observations. This also leads to thewell known overlap in rotational velocities of the normal and Am starsfor 402.5d.We have exploited this empirical cutoff function to calibrate thecorresponding turbulent diffusion coefficient associated with tidalmixing, having found out that the computed form of the lines of constantturbulence fits qualitatively the empirical shape of the curves ofconstant metallicity. As for larger orbital periods(20d55km/s found by Burkhart(1979) would then be nothing but a manifestation of insufficientlypopulated corresponding area of larger P_orb_.
|
Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
|
UBV Photometry of W Ser Stars
Not Available
|
Radio continuum emission from stars: a catalogue update.
An updated version of my catalogue of radio stars is presented. Somestatistics and availability are discussed.
|
The 71st Name-List of Variable Stars
Not Available
|
The remarkable ultraviolet spectrum of HD 43246
Not Available
|
HD 43246 and HD 127208 - Two unusual F-G + B binary systems
New optical spectroscopic observations along with ultraviolet IUEobservations have been obtained for the two interacting F or G III + B Vbinaries: HD 43246 and HD 127208. Photometric observations indicaterandom changes superimposed on regular ellipsoidal light variations, thelatter probably the result of tidal distortion of the giant primaries.Mass transfer and loss is apparent in inverted mass ratios derived fromorbital analysis, strong wind features present in the spectra, and thepresence of circumsystem shells. Regular and irregular changes in thespectral features are discussed in this context.
|
HD 43246 and HD 127208: Two Unusual F+B Binary Systems
Not Available
|
Miscellaneous spectroscopic notes
Results of slit-spectrograph observations are reported for approximately260 stars. The data presented range from recognition of many new Ap, Am,and other unusual stars to H-alpha observations of early-typesupergiants and Be stars. The material discussed was obtained over thepast 40 years at a number of U.S. observatories and at the DominionAstrophysical Observatory in Victoria, B.C.
|
HD 207739 and other F + Be variables
Characteristics for a group of composite spectrum stars which havestrong H alpha emission and peculiar satellite UV spectra are compared.Spectroscopic periods and photometric variability are discussed.Compared with normal noninteracting composite spectrum binaries, theyexhibit excess flux in the middle UV region. This is believed toindicate the presence of an accretion disk.
|
The long-period K + Be binary HR 2577 (MWC 827)
New spectroscopic observations near H-alpha and Na I D, along withultraviolet IUE scans, have been obtained for the K + Be compositesystem HR 2577. High-precision radial-velocity measures do not supportthe suggested 58-year orbit of Hendry (1982). The H-alpha emission fromthe Be component undergoes considerable variations typical of its class.The presence of a Li I 6707 A feature as well as the IUE observationssupport the idea that little or no interaction between the binarycomponents of HR 2577 is taking place.
|
Merged log of IUE observations.
Not Available
|
Strange F + Be binary star systems
The IUE spectra of five stars with F or F + B optical spectra and strongBe star-like H alpha emission were obtained on several dates. No twoexposures of the strange optical variable HD 37453 are quite alike, MgII emission is strong, and the short wave prime (SWP) region has someresemblance to known interacting binaries such as SX Cas. The HD 43246shows significant Si IV absorption against an otherwise normal lateB-spectrum. The HD 166612 shows early B main-sequence spectral featuresexcept for evidence of a strong stellar wind. The HD 207739, discoveredin 1982 to show UV characteristics of a strongly interacting system,showed general brightening in the September observations, opposite tothe visual flux which decreased slightly. The far-UV spectrum of HD207739 was seen to evolve but to remain in between the two extremes seenin 1982, which differed greatly both in character and in absolute flux.
|
A comparison of the orbital inclinations of the spatially close spectroscopic double stars
The reported investigation takes into account 888 spectroscopicbinaries. It was possible to obtain 120 groups whose elements arespatially close according to the given definition. These 120 groupscontain 313 spectroscopic binaries. 136 of these binaries are 2-spectrumsystems, 177 are 1-spectrum systems, and 62 are eclipsing binaries. Thenumber of systems with known luminosity class is 54. The spectraldistribution of the 313 systems is discussed. The orbital inclinationsand other parameters are presented in a table.
|
Seventh catalogue of the orbital elements of spectroscopic binary systems.
Not Available
|
Observations of radio stars at 10.6 GHz
Results are outlined for a program conducted over a period of about twoyears in order to detect and monitor stellar radio emission. A list ofsome 170 candidate radio stars is presented which includes spectraltypes, apparent magnitudes, and distances (where known). Flux densitiesare provided for each of the following stars that were detected at leastonce at a frequency of 10.6 GHz: R Aql, Cyg X-1, Cyg X-3, AR Lac, BetaLyr, Algol, RY Sct, and MWC 349. It is noted that a flare was observedon R Aql, Cyg X-1 exhibited considerable radio variability, Cyg X-3experienced intense radio flaring on several occasions, and the radiospectra of both RY Sct and MWC 349 appear to have a thermal origin. Apossible division of the known radio stars into two classes on the basisof variability time scale is considered.
|
Catalog of Indidual Radial Velocities, 0h-12h, Measured by Astronomers of the Mount Wilson Observatory
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970ApJS...19..387A&db_key=AST
|
Catalogue et bibliographie des étoiles A à spectre particulier Premier supplément
Not Available
|
Catalogue et bibliographie des étoiles A à spectre particulier
Not Available
|
A Catalog of Magnetic Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1958ApJS....3..141B&db_key=AST
|
Report of proceedings of Victoria Dominion Astrophysical Observatory
Not Available
|
Additional Stars whose Spectra have a Bright H α Line.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...112...72M&db_key=AST
|
INHABITED SKY
