Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.4305h&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #43.05; Bulletin of the American Astronomical Society, Vol. 26, p.930
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present results from our extensive survey of chromospheric and coronal activity in lower main-sequence members of the Hyades open cluster. We have obtained H alpha spectroscopy of ninety-one probable cluster members, twenty-three of which lie within three fields for which we have deep ROSAT X-ray observations. Twenty of the twenty-three stars are detected. Combining these observations with data from the literature, we find that the mean ratio log (L_alpha / Lbol) is roughly constant for Mbol > 8, with a substantial dispersion. The X-ray-to-bolometric luminosity ratio increases with decreasing Mbol, although the relation may flatten for Mbol > 9. Comparing this behaviour with stars in the Pleiades cluster, there are significant differences: first, the log (L_alpha / Lbol) relation in the Pleiades increases for Mbol < 10, but appears to turn over sharply at fainter magnitudes, with the lower luminosity stars having nearly an order of magnitude lower H alpha luminosity; second, we find no evidence for saturation in the log (L_X / Lbol) ratio. However, none of the lower luminosity Pleiades stars with low H alpha luminosity have X-ray observations.
Hawley Suzanne L.
Reid Iain Neill
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