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Near-IR speckle imaging of massive young stellar objects
We present near-IR speckle images of 21 massive Young Stellar Objects(YSOs) associated with outflows. The aim of this study is to search forsub-arcsecond reflection nebulae associated with the outflow cavity. Wefind that 6 of the massive YSOs show a conical nebula which can beinterpreted in terms of reflected light from the dusty walls of theoutflow cavity. In all cases, the small scale structures seen in ourimages are compared with outflow indicators found in the literature. Noclear correlation is found between the presence of the reflectionnebulosity and any property such as degree of embeddedness. We also notethat 3 of the sources show close companions, one of them belonging alsoto the sample with conical nebula.Figures \ref{S140SpeckleFig}, \ref{S255SpeckleFig},\ref{Ha101Fig}-\ref{HGL490Fig} and\ref{GL2591SpeckleFig}-\ref{GL5180peckleFig} are only available inelectronic form at http://www.edpsciences.org
| Short-Period Noncontact Close Binary Systems. VI. V392 Orionis
Photometric and spectroscopic observations in the optical region of theshort-period eclipsing binary system V392 Ori (A5 V, P=0.6593d) wereperformed and light and radial velocity curves were obtained. The lightcurves taken at various times are slightly different from one another.Analyses of the light and radial velocity curves yielded photometric andspectroscopic elements of the system. The derived mass function is quitesmall, f(M) = 0.0108 Msolar. The masses of the primary and secondarycomponents were found to be 1.2 Msolar and 0.3 Msolar, respectively, andthe radii are 1.7 Rsolar and 0.9 Rsolar. V392 Ori was found to belong toa group of low-mass binary systems. Due to the semidetached nature ofthe system, the loss of mass/angular momentum from the system mayoccasionally occur, inducing a probable effect on the light curves ofthe system. We compare the system with other low-mass binary systems anddiscuss the e volutionary status of the system.
| 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.
| Photoelectric observations of lunar occultations. X
Photoelectric occulation results for 461 events observed during 15months are reported. They include 77 reappearances, 4 determinations ofangular diameter, 38 analyses of double or multiple stars including twopreviously unknown bright stars, and 8 previously known bright double ormultiple stars.
| Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance.
Not Available
| La mesure des vitesses radiales au prisme objectif. VII - 2e liste de vitesses radiales déterminées au prisme objectif à vision directe
Not Available
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Besorolás csoportokba:
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Pozíciós és asztrometriai adatok
| Csillagkép: | Orion |
| Rektaszcenzió: | 06h11m26.85s |
| Deklináció: | +18°14'54.8" |
| Vizuális fényesség: | 9.045 |
| RA sajátmozgás: | -6.8 |
| Dec sajátmozgás: | -10 |
| B-T magnitude: | 9.03 |
| V-T magnitude: | 9.044 |
Katalógusok és elnevezések:
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