Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sao..reptq....p&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astronomy
Open Clusters, X Ray Stars, Stellar Spectra, X Ray Astronomy, Dwarf Stars, X Ray Spectra, Rosat Mission, Astronomical Photometry, Stellar Rotation, M Stars
Scientific paper
With regard to the ROSAT/Stellar Dynamos project involving a high-resolution imager (HRI) observation of the open cluster IC4665, reprocessed data was received in October 1995 for a 33 ksec HRI observation representing the first half of the total planned observation for IC4665. Initial analysis shows that there are about 25 x-ray sources in the HRI field which can be matched to known, cataloged, optical counterparts in the cluster region, with spectral types ranging from A-type to M-type dwarfs. FAST 60-inch spectra were reduced to derive spectral type information among cluster members, which will contribute to the optical database of information for this cluster that will be combined with the x-ray data. During October 1995 some photometric monitoring among some M-type cluster members was obtained in an attempt to derive rotation periods for these stars based on brightness variations arising from starspots. Any rotational period information derived from these observations will be used to investigate the rotation/x-ray activity relation among M dwarfs in this cluster. For the NGC2232 cluster, two ROSAT HRI fields are to be observed. So far, only a partial observation of one field, taken in April 1995, has been received. Initial analyses reveal approximately 20 x-ray sources in the region; some low and high resolution spectra were obtained for optical counterparts to a few of these sources during a December/January Multiple Mirror Telescope (MMT) observing run at Mt. Hopkins.
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