Binary Frequency Among Pre-Main Sequence Stars in Taurus and Ophiuchus
نویسندگان
چکیده
منابع مشابه
Polarimetric Variations of Binary Stars. v. Pre-main-sequence Spectroscopic Binaries Located in Ophiuchus and Scorpius
We present polarimetric observations of 7 pre-main-sequence (PMS) spectroscopic binaries located in the ρ Ophiuchus and Upper Scorpius star forming regions (SFRs). The average observed polarizations at 7660Å are between 0.5% and 3.5%. After estimates of the interstellar polarization are removed, all binaries have an intrinsic polarization above 0.4%, even though most of them do not present othe...
متن کاملX-ray flares on zero-age- and pre-main sequence stars in Taurus-Auriga-Perseus
We present the results of a systematic search for Xray flares on young stars observed during ROSAT PSPC observations of the Taurus-Auriga-Perseus sky region. All pointed PSPC observations currently available from the ROSAT Public Data Archive with known pre-main sequence T Tauri Stars or young Pleiads or Hyads in the field of view are analyzed. A study of the activity of late-type stars of diff...
متن کاملUltraviolet-selected Field and Pre-main-sequence Stars toward Taurus and Upper Scorpius
We have carried out a Galaxy Evolution Explorer (GALEX) Cycle 1 guest investigator program covering 56 deg2 near the Taurus T association and 12 deg2 along the northern edge of the Upper Scorpius OB association. We combined photometry in the GALEX far-ultraviolet and near-ultraviolet bands with data from the Two Micron All Sky Survey to identify candidate young ( 100 Myr old) stars as those wit...
متن کاملCoronal abundances of X-ray bright pre-main sequence stars in the Taurus Molecular Cloud
Aims. We studied the thermal properties and chemical composition of the X-ray emitting plasma of a sample of bright members of the Taurus Molecular Cloud to investigate possible differences among classical and weak-lined T Tauri stars and possible dependences of the abundances on the stellar activity level and/or on the presence of accretion/circumstellar material. Methods. We used medium-resol...
متن کاملNew proper motions of pre-main sequence stars in Taurus-Auriga
We present proper motions of 72 T Tauri stars located in the central region of Taurus-Auriga (Tau-Aur). These proper motions are taken from a new proper motion catalogue called STARNET. Our sample comprises 17 classical T Tauri stars (CTTS) and 55 weak-line T Tauri stars (WTTS), most of the latter discovered by ROSAT. 53 stars had no proper motion measurement before. Kinematically, 62 of these ...
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: Highlights of Astronomy
سال: 1989
ISSN: 1539-2996
DOI: 10.1017/s1539299600007565