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The β Cephei variable in the eclipsing binary HD 92024. I. Determination of the orbit
HD 92024 is a member of the open cluster NGC3293; it is the only eclipsing binary system with a β Cepheicomponent known in the southern hemisphere. This paper presents thefirst spectroscopic analysis of the single-lined binary and provides anorbital analysis based on recent high-resolution spectroscopy andphotometry. A procedure to derive orbital elements with minimalinfluence of the pulsational line-profile variations on the radialvelocities is applied, and we find the stellar masses to be 15.0+3.0-4.0Mȯ and 3.0±0.5 Mȯ respectively, and radii of8.4±0.8 Rȯ, 2.1±0.4 Rȯ. The temperatures are 25500±500 K and 12 500±1000 K. The surface gravity values oflog g= 3.77±0.08 and 4.27±0.18 indicate that the binaryconsists of an evolved early B-type primary and a late-B main sequencecompanion. The resulting distance 2.8±0.3 kpc and systemicvelocity -16 km s-1 confirm cluster membership. Theoretical stellarmodels indicate an age of 10-13 Myr, somewhat higher than theliterature value for the brightest members of NGC 3293.Based on observations made with ESO Telescopes at the La SillaObservatory, Chile, under programmes 66.D-0297, 67.D-0023, 68.D-028, andwith the Strömgren Automatic Telescope, La Silla.
| The Carina Spiral Feature: Strömgren-Hβ photometry approach. I. The photometric data-base
A data-base collating all uvbybeta photometry available at present forO-B9 stars brighter than 10th visual magnitude in the field of theCarina Spiral Feature is presented. The completeness and homogeneity ofthe data-base are discussed.Based on CDS data.Table 1 is only available in electronic form at the CDS via anonymousftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/410/523
| Bright blue stars in VELA observed with the 'Glazar' space telescope
Seventy-one stars brighter than about 9 m have been detected at 1640 Ain the Vela region with the space telescope Glazar. It is shown thatmost of the detected stars belong to a B-type stellar association at adistance of 460 pc and to two OB stellar associations at distances of1100 pc and 1700 pc. The existence of B-type stellar association at adistance of 110 pc is suspected. A new O-type star cluster, which is apossible nucleus of the OB stellar association at 1700 pc, has beendetected. The distribution of the absorbing matter in the observed areais studied. We presume that the stars HD 75 063 and 76 534 are probablyembedded in a circumstellar dust shell. All observed stars, includingthose with unknown spectra, are early type stars.
| Distribution of hot stars and interstellar dust in Carina.
Not Available
| An Einstein Observatory SAO-based catalog of B-type stars
About 4000 X-ray images obtained with the Einstein Observatory are usedto measure the 0.16-4.0 keV emission from 1545 B-type SAO stars fallingin the about 10 percent of the sky surveyed with the IPC. Seventy-fourdetected X-ray sources with B-type stars are identified, and it isestimated that no more than 15 can be misidentified. Upper limits to theX-ray emission of the remaining stars are presented. In addition tosummarizing the X-ray measurements and giving other relevant opticaldata, the present extensive catalog discusses the reduction process andanalyzes selection effects associated with both SAO catalog completenessand IPC target selection procedures. It is concluded that X-rayemission, at the level of Lx not less than 10 exp 30 ergs/s, is quitecommon in B stars of early spectral types (B0-B3), regardless ofluminosity class, but that emission, at the same level, becomes lesscommon, or nonexistent, in later B-type stars.
| The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.
| Observations of a region of the Carina OB 1 association using the "Glazar" space telescope.
Not Available
| 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.
| Erratum - Distant Blue Stars in the Southern Milky-Way
Not Available
| Erratum - Errors in the HD Identification in Spectral Survey of the Southern Milky way - Part Three
Not Available
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Посматрања и Астрометриски подаци
| Сазвежђа: | Прамац |
| Ректацензија: | 10h32m21.08s |
| Deклинација: | -58°32'45.0" |
| Apparent магнитуда: | 7.349 |
| Даљина: | 273.224 parsecs |
| Proper motion RA: | -14.7 |
| Proper motion Dec: | 3.3 |
| B-T magnitude: | 7.218 |
| V-T magnitude: | 7.339 |
Каталог и designations:
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INHABITED SKY
