The late-type stellar component in the ROSAT All-Sky Survey at high galactic latitude

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dc.creatorZickgraf, F. -J.
dc.creatorAlcala, J. M.
dc.creatorCovino, E.
dc.creatorKrautter, J.
dc.creatorAppenzeller, I.
dc.creatorFrink, S.
dc.creatorSterzik, M. F.
dc.date1999-12-06
dc.date.accessioned2026-07-07T02:34:48Z
dc.date.available2026-07-07T02:34:48Z
dc.descriptionWe investigated the properties of the late-type stellar component in the RASS at high-galactic latitude |b| based on an optically identified sample of ROSAT All-Sky Survey (RASS) X-ray sources. The stellar sample comprises ~250 objects in six study areas covering 685 deg^2 at |b|> 20 deg. We spectroscopically detected a significant fraction of lithium-rich pre-main sequence (PMS) objects including even M-type stars. In an area located about 20 deg south of the Tau-Aur star formation region (SFR) and close to the Gould Belt, we found a large fraction of 40% PMS stars among the K-type stellar counterparts. In other areas we found a smaller but still significant fraction of Li-rich stars. We compared the log N - log S distribution with published galactic distribution models for different age groups and with results from the ROSAT Galactic Plane Survey. For the sample south of Tau-Aur we find an excess of PMS stars compared to model calculations while in the other areas the observed log N - log S is close to the model predictions. We started to investigate the proper motions and radial velocities of both, the young lithium-rich and the older stellar counterparts. Radial velocities and proper motions of the Li-rich stars in the area south of Tau-Aur are consistent with membership to the Tau-Aur SFR. The non-PMS stars show a wider spread in radial velocities and proper motions.
dc.description6 pages, 9 postscript figures, to appear in "Cool Stars, Stellar Systems and the Sun", 11th Cambridge Workshop, Puerto del Cruz, ASP conference series
dc.identifierhttps://arxiv.org/abs/astro-ph/9912094
dc.identifierhttp://arxiv.org/abs/astro-ph/9912094
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15386
dc.subjectAstrophysics
dc.titleThe late-type stellar component in the ROSAT All-Sky Survey at high galactic latitude
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