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Four-colour photometry of eclipsing binaries. XLI.. uvby light curves for AD Bootis, HW Canis Majoris, SW Canis Majoris, VZ Hydrae, and WZ Ophiuchi
Context: Accurate mass, radius, and abundance determinations frombinaries provide important information on stellar evolution, fundamentalto central fields in modern astrophysics and cosmology. Aims:Within the long-term Copenhagen Binary Project, we aim to obtainhigh-quality light curves and standard photometry for double-lineddetached eclipsing binaries with late A, F, and G type main-sequencecomponents, needed for the determination of accurate absolute dimensionsand abundances, and for detailed comparisons with results from recentstellar evolutionary models. Methods: Between March 1985 and July2007, we carried out photometric observations of AD Boo, HW CMa, SW CMa,V636 Cen, VZ Hya, and WZ Oph at the Strömgren Automatic Telescopeat ESO, La Silla. Results: We obtained complete {uvby} lightcurves, ephemerides, and standard {uvby}? indices for all sixsystems. For V636 Cen and HW CMa, we present the first modern lightcurves, whereas for AD Boo, SW CMa, VZ Hya, and WZ Oph, they are bothmore accurate and more complete than earlier data. Due to a high orbitaleccentricity (e = 0.50), combined with a low orbital inclination (i =84.7°), only one eclipse, close to periastron, occurs for HW CMa.For the two other eccentric systems, V636 Cen (e = 0.134) and SW CMa (e= 0.316), apsidal motion has been detected with periods of 5270 ±335 and 14 900 ± 3600 years, respectively.Based on observations carried out with the Strömgren AutomaticTelescope (SAT) at ESO, La Silla, Chile. Appendix A is only available inelectronic form at http://www.aanda.org Tables 6-13 are only availablein electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/487/1081
| 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.
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הכנס מאמר חדש
לינקים קשורים
הכנס לינק חדש
משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | זאב |
| התרוממות ימנית: | 14h20m55.17s |
| סירוב: | -49°21'59.9" |
| גודל גלוי: | 7.531 |
| מרחק: | 100.301 פארסק |
| תנועה נכונה: | -23.6 |
| תנועה נכונה: | -2.4 |
| B-T magnitude: | 7.759 |
| V-T magnitude: | 7.55 |
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