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On the Wilson-Bappu relationship in the Mg II k line
An investigation is carried out on the Wilson-Bappu effect in the Mg Iik line at 2796.34 Å. The work is based on a selection of 230 starsobserved by both the IUE and HIPPARCOS satellites, covering a wide rangeof spectral types (F to M) and absolute visual magnitudes (-5.4<=MV <=9.0). A semi-automatic procedure is used to measurethe line widths, which applies also in the presence of strong centralabsorption reversal. The Wilson-Bappu relationship here provided isconsidered to represent an improvement over previous recent results forthe considerably larger data sample used, as well as for a properconsideration of the measurement errors. No evidence has been found fora possible dependence of the WB effect on stellar metallicity andeffective temperature.
| The ROSAT all-sky survey catalogue of optically bright late-type giants and supergiants
We present X-ray data for all late-type (A, F, G, K, M) giants andsupergiants (luminosity classes I to III-IV) listed in the Bright StarCatalogue that have been detected in the ROSAT all-sky survey.Altogether, our catalogue contains 450 entries of X-ray emitting evolvedlate-type stars, which corresponds to an average detection rate of about11.7 percent. The selection of the sample stars, the data analysis, thecriteria for an accepted match between star and X-ray source, and thedetermination of X-ray fluxes are described. Catalogue only available atCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| The Mg II H and K interstellar lines in the spectrum of the G-type giant HD 156854
The results of the measurements and analysis of the IUE observations ofthe 2800 Mg II doublet in the spectrum of HD 156854, a G9 III star, arepresented. The relative power of the magnesium chromosphere, R(Mg) =0.00001, is in agreement with the known data for giants of the sameclass. The emission profiles of this doublet present absorption cores,which are of interstellar origin. Taking into account the interstellardepletion of Mg, the derived density of interstellar hydrogen is n(H) =0.001/cu cm, which agrees with the conclusion (Paresce 1984) about thepossibility of large hydrogen concentrations in some directions of theGalaxy far from the sun.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
| Radial Velocities of Some Bright Southern Stars
Not Available
| Photometry of HR 6384 - an 80 Day Ellipsoidal Binary?
Not Available
| HR 6384: a Probable Interacting Binary
Not Available
| Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1985A&AS...59...15A&db_key=AST
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Observation and Astrometry data
| Constellation: | Altar |
| Right ascension: | 17h23m06.90s |
| Declination: | -56°31'31.0" |
| Apparent magnitude: | 5.8 |
| Distance: | 125.313 parsecs |
| Proper motion RA: | 9.3 |
| Proper motion Dec: | 3.3 |
| B-T magnitude: | 7.018 |
| V-T magnitude: | 5.873 |
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