Advanced search    

Search: authors:"E. H. Olsen"

13 papers found.
Use AND, OR, NOT, +word, -word, "long phrase", (parentheses) to fine-tune your search.

Strömgren and Hβ photometry of O and B type stars in star-forming regions - III. Carina Spiral Feature

Strömgren and Hβ photometry of O and B type stars, generally brighter than 9.5 mag is reported for the field of the Carina Spiral Feature. The observations are based on the PPM catalogue identifications and are designed to improve the completeness of the existing data for the bright early-type stars in the field. We present new uvby photometry for 283 stars and Hβ photometry for...

Absolute dimensions of eclipsing binaries - XXVII. V1130 Tauri: a metal-weak F-type system, perhaps with preference for Y = 0.23–0.24

Context. Double-lined, detached eclipsing binaries are our main source for accurate stellar masses and radii. This paper is the first in a series with focus on the upper half of the main-sequence band and tests of 1–2  evolutionary models. Aims. We aim to determine absolute dimensions and abundances for the detached eclipsing binary V1130 Tau, and to perform a detailed comparison...

Absolute dimensions of solar-type eclipsing binaries - III. EW Orionis: stellar evolutionary models tested by a G0 V system

Context. Recent studies of inactive and active solar-type binaries suggest that chromospheric activity, and its effect on envelope convection, is likely to cause significant radius and temperature discrepancies. Accurate mass, radius, and abundance determinations from additional solar-type binaries exhibiting various levels of activity are needed for a better insight into the...

A photometric survey of stars with circumstellar material

We present the result of a follow-up Strömgren photometric survey of sixteen southern bright stars with circumstellar material, in order to detect possible weak photometric variations. We found new variations of the Pictoris brightness from 1999 to 2002 with a weak long-term variation of ~ mag per year, over about 3 years. These variations look similar to those seen from 1975 to...

Four-colour photometry of eclipsing binaries - XL. uvby light curves for the B-type systems DW Carinae, BF Centauri, AC Velorum, and NSV 5783

Aims.In order to increase the limited number of B-stars with accurately known dimensions, and also the number of well studied eclipsing binaries in open clusters, we have undertaken observations and studies of four southern double-lined eclipsing B-type binaries; DW Car, BF Cen, AC Vel, and NSV 5783.Methods.Complete light curves were observed between January 1982 and April 1991...

Absolute dimensions of solar-type eclipsing binaries. - I. light curves for HS Aqr, KX Aqr, AL Ari, V963 Cen, MR Del, NY Hya, DU Leo, UW LMi, and V358 Pup

0 E. H. Olsen 0 0 Niels Bohr Institute for Astronomy , Physics, and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen , Denmark We present complete uvby light curves of 9

Strömgren and Hβ photometry of O and B type stars in star-forming regions - III. Carina Spiral Feature

Strömgren and Hβ photometry of O and B type stars, generally brighter than 9.5 mag is reported for the field of the Carina Spiral Feature. The observations are based on the PPM catalogue identifications and are designed to improve the completeness of the existing data for the bright early-type stars in the field. We present new uvby photometry for 283 stars and Hβ photometry for...

The Geneva-Copenhagen survey of the Solar neighbourhood - Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs

We present and discuss new determinations of metallicity, rotation, age, kinematics, and Galactic orbits for a complete, magnitude-limited, and kinematically unbiased sample of 16 682 nearby F and G dwarf stars. Our ~63 000 new, accurate radial-velocity observations for nearly 13 500 stars allow identification of most of the binary stars in the sample and, together with published...

A three-year Strömgren photometric survey of suspected β Pictoris-like stars

We carried out a Strömgren photometric survey of thirteen southern bright stars, including β Pictoris itself, during three years, d'Astrophysique de Paris, in order to detect possible weak photometric variations. β Pictoris presents a small long-term variation with a change of brightness by  mag per year, over about two years from beginning of 1996, a situation relatively similar...

A three-year Strömgren photometric survey of suspected β Pictoris-like stars

We carried out a Strömgren photometric survey of thirteen southern bright stars, including β Pictoris itself, during three years, d'Astrophysique de Paris, in order to detect possible weak photometric variations. β Pictoris presents a small long-term variation with a change of brightness by  mag per year, over about two years from beginning of 1996, a situation relatively similar...

The eclipsing double-lined binaries V883 Cen and η Mus*

We derive the orbital period and monitor in detail the eclipses of two deep-southern double-lined eclipsing binaries of considerable interest. We present new uvby photometry over more than 100 nights for V883 Cen, scan for the first time the eclipses of η Mus and analyse the data for these two systems together with earlier published photometry. We also add information from high...

The CORALIE survey for southern extra-solar planets - IX. A 1.3-day period brown dwarf disguised as a planet

In this article we present the case of HD 41004 AB, a system composed of a K0V star and a 3.7-mag fainter M-dwarf companion. We have obtained 86 CORALIE spectra of this system with the goal of obtaining precise radial-velocity measurements. Since HD 41004 A and B are separated by only 0.5´´, in every spectrum taken for the radial-velocity measurement, we are observing the blended...

The HARPS search for southern extra-solar planets - VII. A very hot Jupiter orbiting HD 212301

We report the discovery of a planetary companion orbiting the F8V star HD 212301. This is the first “very hot Jupiter” discovered by a radial velocity survey. The detection was made possible by the HARPS spectrograph installed at the ESO 3.6 m telescope in Cerro La Silla, Chile. The data were carefully analyzed to exclude activity induced effects on the measured radial velocities...