Search Publications
Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations
Jorissen, A.; Pourbaix, D.; Udry, S. +4 more
Context: This paper is a follow-up on the vast effort to collect radial velocity data for stars belonging to the Hipparcos survey.
Aims: We aim at extending the orbital data available for binaries with M giant primaries. The data presented in this paper will be used in the companion papers of this series to (i) derive the binary frequency amon…
The isolated neutron star candidate 2XMM J104608.7-594306
Motch, C.; Treves, A.; Turolla, R. +2 more
Over the last decade, X-ray observations have revealed the existence of several classes of isolated neutron stars (INSs) which are radio-quiet or exhibit radio emission with properties much at variance with those of ordinary radio pulsars. The identification of new sources is crucial in order to understand the relations among the different classes…
On the differential rotation of CoRoT-2a
Strassmeier, K. G.; Hatzes, A. P.; Küker, M. +1 more
We apply a robust spot model to fit the light curve of CoRoT-2a. The spots are assumed to be long-living and each has its own rotation period. A model with three circular spots reproduces the basic features of the longitude-time spot coverage map. One of the spots exhibits a noticeably lower rotational frequency than the other two. From the rotati…
Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of γ Doradus stars
Uytterhoeven, K.; Drummond, R.; De Ridder, J. +21 more
Context: γ Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably.
Aims: A selected group of γ Dor stars and some candidates were observed with the Mercator telescope to find and/or confirm t…
HST/ACS colour-magnitude diagrams of M 31 globular clusters
Cacciari, C.; Bellazzini, M.; Galleti, S. +3 more
Aims: With the aim of increasing the sample of M 31 clusters for which a colour-magnitude diagram is available, we searched the HST archive for ACS images containing objects included in the Revised Bologna Catalogue of M 31 globular clusters (RBC Version 3.5 available at: http://www.bo.astro.it/M31).
Methods: Sixty-three such objects were foun…
Young stars and protostellar cores near NGC 2023
Mookerjea, B.; Sandell, G.; Jarrett, T. H. +1 more
Context: We investigate the young (proto)stellar population in NGC 2023 and the L 1630 molecular cloud bordering the h ii region IC 434, using Spitzer IRAC and MIPS archive data, JCMT SCUBA imaging and spectroscopy as well as targeted BIMA observations of one of the Class 0 protostars, NGC 2023 MM 1.
Aims: We study the distribution of gas, dus…
The diverse X-ray properties of four truly isolated elliptical galaxies: NGC 2954, NGC 6172, NGC 7052, and NGC 7785
Wolter, A.; Trinchieri, G.; Memola, E. +2 more
Aims: We investigate the X-ray properties of four isolated elliptical galaxies, selected from the Updated Zwicky Catalog according to strict isolation criteria. Isolated galaxies are not influenced by the group/cluster environment, and their X-ray emission can be studied independently of the often overwhelming contribution of the hot intergalactic…
An HST/WFPC2 survey of bright young clusters in M31. I. VdB0, a massive star cluster seen at t ≃ 25 Myr
Barmby, P.; Bellazzini, M.; Galleti, S. +12 more
Aims: We introduce our imaging survey of possible young massive globular clusters in M31 performed with the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). We obtained shallow (to B∼ 25) photometry of individual stars in 20 candidate clusters. We present here details of the data reduction pipeline that is being appli…
Planetary transit candidates in the CoRoT initial run: resolving their nature
Mazeh, T.; Aigrain, S.; Alonso, R. +45 more
With the release of CoRoT lightcurves of the Initial Run IRa01, 50 transiting planetary candidates have been published in a companion paper. About twenty of them were identified as binary stars from the CoRoT lightcurve itself. Complementary observations were conducted for 29 candidates, including ground-based photometry and radial-velocity measur…
The galactic unclassified B[e] star HD 50138. I. A possible new shell phase
Meilland, A.; Domiciano de Souza, A.; Chesneau, O. +4 more
Context: The observed spectral variation of HD 50138 has led different authors to classify it in a very wide range of spectral types and luminosity classes (from B5 to A0 and III to Ia) and at different evolutionary stages as either HAeBe star or classical Be.
Aims: Based on new high-resolution optical spectroscopic data from 1999 and 2007 ass…