SIMBAD references

1998A&AS..131..197M - Astron. Astrophys., Suppl. Ser., 131, 197-208 (1998/August-0)

F, G and K stars in the ROSAT All-Sky Survey. I. Photometry.


Abstract (from CDS):

We present accurate BV(RI)c photometry for a sample of F, G and K stars detected in selected areas of the ROSAT all-sky survey (RASS). We have used the photometry, in addition to low-resolution spectroscopy, to estimate spectral classifications, distances and X-ray luminosities. The log(LX/LV) in the sample lies below -2. Although the sample contains also nearby, inactive stars, it is dominated by active objects. The median X-ray luminosity in our sample is <LX≥29.88 and the mean value of the hardness ratios <HR1≥0.13±0.35. We compare the derived X-ray luminosity function with similar functions obtained from the serendipitous samples of the Einstein Observatory medium sensitivity survey (EMSS) and EXOSAT. Our sample is completely consistent with the EMSS sample of solar type stars, indicating that both our sources and the EMSS sources are representative of the high galactic latitude X-ray stellar population. We do not find extremely active stars (log(LX)≥32), as are found in the EMSS sample, and we argue that these objects are rare.

Abstract Copyright:

Journal keyword(s): stars: late-type - X-ray: stars - surveys

VizieR on-line data: <Available at CDS (J/A+AS/131/197): notes.dat table3.dat>

Simbad objects: 107

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:1998A&AS..131..197M and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact