Search Publications
Absolute magnitudes for late-type dwarf stars for Sloan photometry
Bilir, S.; Karaali, S.; Tunçel, S.
We present a new formula for absolute magnitude determination for late-type dwarf stars as a function of (g-r) and (r-i) for Sloan photometry. The absolute magnitudes estimated by this approach are brighter than those estimated by colour-magnitude diagrams, and they reduce the luminosity function rather close to the luminosity function of Hipparco…
Ultracool dwarf binaries
Bouy, H.; Bouvier, J.; Brandner, W. +1 more
We review here the multiplicity properties of ultracool dwarfs (spectral type later than M6) observed in three different environments and at three different ages: in the field, where the objects are relatively old (1-5 Gyrs) and isolated, in the Pleiades young (∼120 Myr) open cluster, and in the young (∼5 Myr) Upper Scorpius OB association (USco).…
The field of IC 2602: Strömgren-Hβ photometry approach
Kaltcheva, N.; Jaeger, S.; Kaba Bah, M. +1 more
A homogeneous data-base collating all uvbyβ photometry available at present for O-B9 stars in the field of IC 2602 is presented. The characteristics of the field are studied. Four spatially coherent groups can be distinguished. A low reddened compact group located at 156±6 pc is identified with IC 2602, followed by background layers at 546±33 pc, …