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HD 164844


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
Not Available

Absolute proper motions of open clusters. I. Observational data
Mean proper motions and parallaxes of 205 open clusters were determinedfrom their member stars found in the Hipparcos Catalogue. 360 clusterswere searched for possible members, excluding nearby clusters withdistances D < 200 pc. Members were selected using ground basedinformation (photometry, radial velocity, proper motion, distance fromthe cluster centre) and information provided by Hipparcos (propermotion, parallax). Altogether 630 certain and 100 possible members werefound. A comparison of the Hipparcos parallaxes with photometricdistances of open clusters shows good agreement. The Hipparcos dataconfirm or reject the membership of several Cepheids in the studiedclusters. Tables 1 and 2 are only available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

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 catalogue of [Fe/H] determinations: 1996 edition
A fifth Edition of the Catalogue of [Fe/H] determinations is presentedherewith. It contains 5946 determinations for 3247 stars, including 751stars in 84 associations, clusters or galaxies. The literature iscomplete up to December 1995. The 700 bibliographical referencescorrespond to [Fe/H] determinations obtained from high resolutionspectroscopic observations and detailed analyses, most of them carriedout with the help of model-atmospheres. The Catalogue is made up ofthree formatted files: File 1: field stars, File 2: stars in galacticassociations and clusters, and stars in SMC, LMC, M33, File 3: numberedlist of bibliographical references The three files are only available inelectronic form at the Centre de Donnees Stellaires in Strasbourg, viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5), or viahttp://cdsweb.u-strasbg.fr/Abstract.html

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

Star Formation in NGC 6531-Evidence From the age Spread and Initial Mass Function
Abstract image available at:http://adsabs.harvard.edu/abs/1996AJ....112.1073F

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.

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.

The galactic abundance gradients traced by B-type stars
We obtained high S/N, high resolution spectra of 16 B-type main sequencestars in young open clusters and in H II regions with galactocentricdistances between 7 and 16 kpc. Chemical abundances for this sample werederived using line-blanketed Local Thermodynamic Equilibrium (LTE) modelatmospheres and line formation in LTE. Our analyses together withpublished data from similar analyses of B-type stars result in flatgradients or even no gradients at all for oxygen and nitrogen in theouter part of the galactic disk. It is conjectured that the largermetallicity gradients cited for H II regions are essentially due to asteepening within the inner 6 kpc towards the galactic center.

Uvby-beta observations of 528 type B stars with V between the 8th and 9th magnitude
The paper presents uvby-beta measurements of 528 type B stars selectedfrom the SAO Catalog on the basis of two criteria: the spectral types inthe range B3-B5 and mV between the 8th and the 9th magnitude. Reddeningindependent (c1) values are estimated from the spectral classificationand compared to the observed values. No systematic trend with observed(b-y), H-beta, or spectral type appears to be present, but the range of(c1) residuals is surprisingly large. A rather large part of the starshas small beta values, smaller than for the BIa supergiants. Only twoare classified as O stars and most of them have the suffix e, ne, ornne. Most beta values for the O type stars are slightly above the upperlimit of 2.585 m.

The chemical composition of six southern clusters and associations
Seventy-one early-type main-sequence stars have been observedspectroscopically in five southern galactic clusters and a looseassociation. Hydrogen-line profiles and helium-diffuse-line equivalentwidths have been measured for all stars, together with line strengthsfor metal and helium nondiffuse lines in 27 stars with small projectedrotational velocities. Stromgren photometry has been obtained for starswhere previous results do not exist, and effective temperatures havebeen determined from the index. Surface gravities have been estimatedprimarily from theoretical profiles fitted to the H-delta absorptionline, and also from H-beta photometry. Abundances, deduced fromcomparison with LTE and non-LTE model-atmosphere calculations, aregenerally found to be consistent with a normal early-type stellarcomposition.

Distance Moduli of Open Clusters.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1965ApJS...12..215H&db_key=AST

Photometry of stars in galactic cluster fields.
Not Available

Turbulence and rotation in early-type stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1961MNRAS.123...81M&db_key=AST

Studies in Galactic STRUCTURE.II.LUMINOSITY Classification for 1270 Blue Giant Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJS....2...41M&db_key=AST

A Finding List of O and B Stars of High Luminosity.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...113..141N&db_key=AST

Interstellar Calcium Lines in the Spectra of Stars in Open Clusters.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1949ApJ...110..117S&db_key=AST

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Osservazione e dati astrometrici

Costellazione:Sagittario
Ascensione retta:18h04m02.93s
Declinazione:-22°33'57.4"
Magnitudine apparente:8.248
Distanza:1538.462 parsec
Moto proprio RA:-0.8
Moto proprio Dec:-1.9
B-T magnitude:8.209
V-T magnitude:8.245

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 164844
TYCHO-2 2000TYC 6842-425-1
USNO-A2.0USNO-A2 0600-30220085
HIPHIP 88484

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