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X-ray Luminosities in Blanco 1
We present X-ray Luminosity Distributions (XLDs) of late-type members (dF, dG, dK, dM) of the Blanco 1 cluster, based on ROSAT-HRI data and new astrometric-photometric... -
Stellar Rotation in the Orion Nebula Cluster
Table 1 lists the 1562 stars in the Orion Nebula Cluster brighter than I=20mag on which we did photometry. It contains information on the position, brightness and variability of... -
Binary and multiple clusters in the LMC
Based on the Bica et al. (1999, Cat. ) catalogue we studied the star cluster system of the LMC area and provide a new catalogue of all binary and multiple cluster candidates... -
Absolute proper motions of 93 open clusters
We determined the mean absolute proper motion of 93 open clusters situated farther than 1 kpc from the Sun. The results are derived from the stellar proper motion data given in... -
Proper motions and membership in NGC 2548
Absolute proper motions, their corresponding errors and membership probabilities of 501 stars in the open cluster NGC 2548 region are given. 265 stars from Tycho-2 Catalogue... -
Absolute proper motions of 112 open clusters
We present mean absolute proper motions of 112 open clusters, determined using the data from the Tycho2 Catalogue (Cat. ). For 28 clusters, this is the first determination of... -
Lithium abundances in IC 2602 and IC 2391
Lithium abundances and [Fe/H] for a sample of late-type stars in the young open clusters IC 2602 and IC 2391. Abundances are based on high resolution spectra obtained at ESO... -
HRI observations of PMS stars in NGC 2264
We analyze six ROSAT HRI observations pointed toward the Star Forming Region (SFR) NGC 2264. Three are pointed to the southern star formation core, the other three about 20' to... -
Pleiades member list
The luminosity function (LF) of the Pleiades cluster stars was constructed for the study of the LF fine structure related to pre-main sequence (MS) stellar evolution.... -
Masses of Pleiades members
On the basis of the best available member list and duplicity information, we have studied the radial distribution of 270 stars and multiple systems earlier than K0 in the... -
NGC 2516 X-ray sources
The ROSAT PSPC detector was used to obtain a deep pointing with its center on the young open cluster NGC 2516 and total integration time of 9284 sec. Altogether 64 X-ray sources... -
Variable stars in field of NGC 7789
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Photometric study of IC 4665
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Tonantzintla Pleiades Flare Stars
The original catalog lists the flare stars discovered by different astronomical observatories over an area slightly larger than 20 square degrees in the Pleiades regions...
