2000/07/24 by B. Stelzer, Stelzer, B., R. Neuhäeuser +2
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #FOS: Physical sciences #Space Exploration and Technology #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0007350
13 pages, accepted by A&A main journal
arxiv created 2000/07/24 · openalex publication_date 2000/07/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on X-ray emission from members of the recently discovered Tucanae association, a group of stars with youth signatures and similar space motion. The Tucanae association is the nearest known region of recent star formation (at 45 pc) far from molecular clouds. We have made use of the ROSAT Data Archive, and searched for X-rays from Tucanae stars in both ROSAT All-Sky Survey (RASS) and pointed observations. The RASS detection rate for the Tucanae members is 59%. We compare the X-ray luminosity function of the Tucanae association to that of other star forming regions and young star clusters. Both the X-ray luminosity function and the strong variability observed in the X-ray lightcurves suggest that the examined stars are young, on the order of 10-30 Myrs.