ACIS-I observations of NGC 2264. Membership and X-ray properties of PMS stars
نویسندگان
چکیده
منابع مشابه
HRI observations of PMS stars in NGC 2264
We analyze six ROSAT HRI observations pointed toward the Star Forming Region (SFR) NGC 2264. Three are pointed to the southern star formation core, the other three about 20’ to the north. We detect 169 X-ray sources, ∼ 95% of which are likely to be Pre Main Sequence (PMS) stars, significantly enlarging the known population of the SFR in the area covered by the observations. Using published BVRI...
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We present the results of an extensive search for periodic and irregular variable pre-main sequence (PMS) stars in the young (2–4 Myr) open cluster NGC 2264, based on photometric monitoring using the Wide Field Imager (WFI) on the 2.2 m telescope on La Silla (Chile). In total, about 10600 stars with IC magnitudes between 9.8 mag and 21 mag have been monitored in our 34 ×33 field. Time series da...
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in this thesis, at first we investigate the bounded inverse theorem on fuzzy normed linear spaces and study the set of all compact operators on these spaces. then we introduce the notions of fuzzy boundedness and investigate a new norm operators and the relationship between continuity and boundedness. and, we show that the space of all fuzzy bounded operators is complete. finally, we define...
15 صفحه اولSpectroscopic Abundances in Cool Pleiades Dwarfs and Ngc 2264 Stars
We derive parameters and abundances of several elements in two cool Pleiades dwarfs, four cool NGC 2264 preÈmain-sequence stars, and a probable NGC 2264 nonmember from high-resolution, moderate signal-to-noise ratio, Keck/HIRES spectra. Our Pleiades Fe abundance agrees with previous spectroscopic and photometric values of hotter stars and does not resolve the 0.3 mag distance modulus discrepanc...
متن کاملX-ray Emitting Pms Stars in Upper Sco-cen: the X-ray Faint Population
We have performed an X-ray-based survey of the upper Sco-Cen star forming region, combining a deep ROSAT HRI pointing performed explicitly for this purpose with shallower ROSAT PSPC and HRI pointings from the public archive. Tens of X-ray sources are detected, down to limiting X-ray luminosities approximately one order of magnitude fainter that previously reported (on the basis of Einstein IPC ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20065084