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High resolution NA D and K I interstellar profiles towards stars in the globular cluster M4
Observations are presented of interstellar Na D and K I profiles towards16 stars in the globular cluster M4. Two strong, low-velocity componentsare detected, at velocities of approx. = -5 km/s and approx. = +3 km/s.A weaker component at approx. = +20 km/s is detected towards most of thestars in the Na I data. All of these components show considerablevariations in strength across the cluster, and the closest pair of starsobserved reveal variations in structure in the Interstellar Medium (ISM)on a scale of approx. 0.01 pc. We identify the +3 km/s component withdiffuse gas associated with the nearby rho Ophiuchi dark cloud. The -5km/s component may be associated with an expanding shell around asubgroup of the Sco-Cen association, and is located at less than 150 pc.This component shows large variations in strength and velocity acrossthe cluster. The K I line strengths suggest a more complex variation inthe reddening across the cluster than that previously reported.
| A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.
| 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.
| Physical parameters of stars in the Scorpio-Centaurus OB association
Walraven photometry is presented of established and probable members ofthe Scorpio-Centaurus OB association. For each star, effectivetemperature and surface gravity are derived using Kurucz (1979)atmosphere models. From the Straizys and Kuriliene (1981) tables,absolute magnitudes are calculated. Distance moduli and visualextinctions are determined for all stars. From a comparison of theHR-diagrams of the stars in each subgroup with theoretical isochrones,the ages of the three subgroups are derived. The distances to the threesubgroups are shown to be different; there is a general trend (alsowithin each subgroup) for the distances to be larger at higher galacticlongitudes. The visual extinction in the youngest subgroupUpper-Scorpius, is well correlated with the IRAS 100-micron map. Thedistance toward the Ophiuchus dark clouds is found to be 125 pc, basedon the photometric distances to the stars. Most of the early-type starsin Upper-Scorpius are located at the far side of the dark clouds.
| Some Characteristics of the B and A Stars in the Upper Scorpius Complex
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1967ApJ...147.1003G&db_key=AST
| A Study of the II Scorpii Asscoiation.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1961ApJ...133..843H&db_key=AST
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Besorolás csoportokba:
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Pozíciós és asztrometriai adatok
| Csillagkép: | Skorpió |
| Rektaszcenzió: | 16h12m43.56s |
| Deklináció: | -28°19'18.1" |
| Vizuális fényesség: | 8.924 |
| Távolság: | 10000000 parszek |
| RA sajátmozgás: | 0.4 |
| Dec sajátmozgás: | -2.7 |
| B-T magnitude: | 8.95 |
| V-T magnitude: | 8.927 |
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