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26 April 2024 |
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The late-type stellar component in the ROSAT All-Sky Survey at high galactic latitude | | F.-J. Zickgraf
; J.M. Alcala
; E. Covino
; J. Krautter
; I. Appenzeller
; S. Frink
; M.F. Sterzik
; | | Date: |
6 Dec 1999 | | Subject: | astro-ph | | Abstract: | We 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. | | Source: | arXiv, astro-ph/9912094 | | Services: | Forum | Review | PDF | Favorites | |
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