We present the results of a joint ROSAT High Resolution Imager (HRI) and optical investigation of the open cluster IC 4665. The ROSAT data contains detections for 28 stellar sources in the eld, including 22 cluster members and candidate members spanning the color range [0.18 (B[V ) 0 1.63 (DB3M3). Upper limits are given for the remaining members (or candidate members) in the HRI eld. Keck HIRES spectra have been obtained that yield radial and rotational velocity measures, respectively, for faint, low-mass candidate members located within the eld of the ROSAT HRI observation. In addition, photometry of possible optical counterparts to previously uncataloged X-ray sources in the HRI eld is presented.
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Giampapa et al. (1998) studied this question.
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