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Proper motions and astrometry of late-type dwarfs
We report proper-motion measurements for 427 late-type M, L, and T dwarfs, 332 of which have been measured for the first time. Combining these new proper motions with previously... -
VRIH{alpha} photometry in NGC 2264
We have performed deep wide-field CCD photometry of the young open cluster NGC 2264 to study the extent of star-forming regions (SFRs) and the shape of the initial mass... -
New close binary systems from the SDSS DR5
We present the latest catalog of more than 1200 spectroscopically selected close binary systems observed with the Sloan Digital Sky Survey through Data Release Five. We use the... -
Luminosity function of M7-L8 ultracool dwarfs
We present a 20pc, volume-limited sample of M7-L8 dwarfs created through spectroscopic follow-up of sources selected from the Two Micron All Sky Survey Second Incremental... -
Close binary systems from SDSS DR4
We present a spectroscopic sample of 746 detached close binary systems from the Sloan Digital Sky Survey (SDSS) Fourth Data Release (2006ApJS..162...38A). The majority of these... -
Radial velocities of weak-lines T Tauri stars
To search for thermal emission from substellar companions, we have obtained Z-band images of 15 weak-lined T Tauri stars in the Taurus-Auriga and Ophiuchus star-forming regions... -
Nearby ultracool dwarfs in galactic plane
Surveys for nearby low-luminosity dwarfs tend to avoid the crowded regions of the Galactic plane. We have devised near-infrared color-magnitude and color-color selection... -
HST binary very low mass stars and brown dwarfs
We present analysis of Hubble Space Telescope (HST) images of 82 nearby field late M and L dwarfs. We resolve 13 of these systems into double M/L dwarf systems and identify an... -
Reference A0V stars
Hipparcos data for 71 nearby dwarf A0 stars were combined with other data, in particular with high resolution spectra to establish the HR diagram in this temperature range.... -
Main-sequence and subgiants ROSAT data
We present X-ray data for all main-sequence and subgiant stars of spectral types A, F, G, and K and luminosity classes IV and V listed in the Bright Star Catalogue (Cat. ) that... -
Velocities and duplicity of F-type dwarfs
We present new radial and rotational velocities for 595 nearby early F dwarfs, based on digital spectra cross-correlated with individually optimised synthetic template spectra.... -
M dwarfs model photospheres. II.
We present a table of new "classical" model photospheres for M dwarfs computed with an extensive set of atomic and molecular opacities treated with the accurate and realistic... -
Dwarfs and subdwarfs IR photometry
The results of a long term programme of broad band JHK photometry, for a sample of 360 late type stars, made at the Observatorio del Teide (Tenerife, Spain) are presented. -
MeerLICHT phot. of hot sub-luminous stars
Colour-magnitude diagrams reveal a population of blue (hot) subluminous objects with respect to the main sequence. These hot subluminous stars are the result of evolutionary... -
Gaia DR3 data of 15062 gravity-mode pulsators
Gravito-inertial asteroseismology saw its birth thanks to high-precision CoRoT and Kepler space photometric light curves. So far, it gave rise to the internal rotation frequency... -
Period-spacing patterns in TESS southern CVZ
The theory of stellar evolution presents shortcomings when confronted with asteroseismic probes of interior physical properties. The differences between observations and theory... -
Dwarf stars limb-darkening coefficients
Stellar models applied to large stellar surveys of the Milky Way need to be properly tested against a sample of stars with highly reliable fundamental stellar parameters. We... -
G 264-012 and Gl 393 radial velocity curves
We report the discovery of two planetary systems, namely G 264-012, an M4.0 dwarf with two terrestrial planets (M_b_sini=2.50^+0.29^-0.30_M{sun} and... -
GJ 740 radial velocities
M-dwarfs have proven to be ideal targets for planetary radial velocity (RV) searches due to their higher planet-star mass contrast, which favors the detection of low-mass... -
Flares in 5 open clusters
Magnetic fields are a key component in the main sequence evolution of low mass stars. Flares, energetic eruptions on the surfaces of stars, are an unmistakable manifestation of...