On X-ray variability in ROSAT-PSPC observations of F7-K2 stars
نویسندگان
چکیده
منابع مشابه
X-ray variability of Pleiades late-type stars as observed with the ROSAT-PSPC
We present a comprehensive analysis of X-ray variability of the late-type (dF7-dM) Pleiades stars, detected in all ROSAT-PSPC observations; X-ray variations on short (hours) and medium (months) time scales have been explored. We have grouped the stars in two samples: 89 observations of 42 distinct dF7-dK2 stars and 108 observations of 61 dK3-dM stars. The Kolmogorov-Smirnov test applied on all ...
متن کاملROSAT PSPC observations of T Tauri stars in MBM 12 ⋆
We present the ROSAT PSPC pointed and ROSAT All-Sky Survey (RASS) observations and the results of our low and high spectral resolution optical followup observations of the T Tauri stars (TTS) and X-ray selected T Tauri star candidates in the region of the high galactic latitude dark cloud MBM12 (L1453-L1454, L1457, L1458). Previous observations have revealed 3 “classical” T Tauri stars and 1 “w...
متن کاملSearching for periods in X-ray observations using Kuiper’s test. Application to the ROSAT PSPC archive
We use Kuiper’s test to detect periodicities in X-ray and gamma-ray observations. Like Rayleigh’s test, it uses the individual photon arrival times, and is therefore well suited to the analysis of faint sources. Our method makes it possible to take into account the discontinuities in the observation, and to completely get rid of the contamination that results from them. This makes it particular...
متن کاملROSAT PSPC X-ray observations of the nearby spiral galaxy M83
The nearly face-on SBc galaxy M 83 (NGC 5236) was observed for 25 ksec with the ROSAT PSPC. We detected 13 point-like sources in this galaxy, 10 of which were previously unknown, down to a limiting luminosity of ∼ 0.8 · 1038 erg s−1 (for D=8.9 Mpc). Eight of these sources are positionally associated with H ii regions and/or H i voids, suggesting an association with the younger stellar populatio...
متن کاملSDSS AGNs with X-ray Emission from ROSAT PSPC Pointed Observations
We present a sample of 1744 of Type 1 AGNs from the Sloan Digital Sky Survey Data Release 4 (SDSS DR4) spectroscopic catalog with X-ray counterparts in the WhiteGiommi-Angelini catalog (WGACAT) of ROSAT PSPC pointed observations. Of 1744 X-ray sources, 1410 (80.9%) are new AGN identifications. Of 4574 SDSS DR4 AGNs for which we found radio matches in the catalog of radio sources from the Faint ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20011693