Newly discovered active binaries in the RasTyc sample of stellar X-ray sources
| dc.creator | Frasca, A. | |
| dc.creator | Guillout, P. | |
| dc.creator | Marilli, E. | |
| dc.creator | Ferrero, R. Freire | |
| dc.creator | Biazzo, K. | |
| dc.date | 2006-10-19 | |
| dc.date.accessioned | 2026-07-07T07:27:03Z | |
| dc.date.available | 2026-07-07T07:27:03Z | |
| dc.description | We present preliminary results of follow-up optical observations, both photometric and spectroscopic, of stellar X-ray sources, selected from the cross-correlation of ROSAT All-Sky Survey (RASS) and TYCHO catalogues. Spectra were acquired with the Elodie spectrograph at the 193-cm telescope of the Haute Provence Observatory (OHP) and with the REOSC echelle spectrograph at the 91-cm telescope of the Catania Astrophysical Observatory (OAC), while UBV photometry was made at OAC with the same telescope. In this work, we report on the discovery of six late-type binaries, for which we have obtained good radial velocity curves and solved for their orbits. Thanks to the OHP and OAC spectra, we have also made a spectral classification of single-lined binaries and we could give first estimates of the spectral types of the double-lined binaries. Filled-in or pure emission H-alpha profiles, indicative of moderate or high level of chromospheric activity, have been observed. We have also detected, in near all the systems, a photometric modulation ascribable to photospheric surface inhomogeneities which is correlated with the orbital period, suggesting a synchronization between rotational and orbital periods. For some systems has been also detected a variation of H-alpha line intensity, with a possible phase-dependent behavior. | |
| dc.description | 4 pages, 3 figures, Proceeeding of "13 Cool Star Workshop" | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0610591 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0610591 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/117243 | |
| dc.subject | Astrophysics | |
| dc.title | Newly discovered active binaries in the RasTyc sample of stellar X-ray sources | |
| dc.type | text |