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Late-type field stars in the RASS at high galactic latitude | F.-J. Zickgraf
; J. Krautter
; S. Frink
; J.M. Alcala
; R. Mujica
; E. Covino
; M.F. Sterzik
; | Date: |
12 Aug 2004 | Subject: | astro-ph | Abstract: | We present results of an investigation on a high-galactic latitude sample of late-type field stars selected from the ROSAT All-Sky Survey (RASS). The sample comprises about 200 G, K, and M stars. Lithium abundances were determined for about 180 G-M stars. Radial velocities were measured for most of the circ. 140 G and K type stars. Combined with proper motions these data were used to study the age distribution and the kinematical properties of the sample. Based on the lithium abundances half of the G-K stars were found to be younger than the Hyades (660 Myr). About 30% are comparable in age to the Pleiades (100 Myr). A small subsample of 10 stars is younger than the Pleiades (100 Myr). They are therefore most likely pre-main sequence stars. Kinematically the PMS and Pleiades-type stars appear to form a group with space velocities close to the Castor moving group but clearly distinct from the Local Association. | Source: | arXiv, astro-ph/0408232 | Services: | Forum | Review | PDF | Favorites |
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