Dead zones around young stellar objects: FU Orionis outbursts and transition discs

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Tracers of Discs and Winds around Intermediate and High Mass Young Stellar Objects

We present a study of the kinematical properties of a small sample of nearby nearinfrared bright massive and intermediate mass young stellar objects using emission lines sensitive to discs and winds. We show for the first time that the broad (∼ 500kms) symmetric line wings on the HI Brackett series lines are due to Stark broadening or electron scattering, rather than pure Doppler broadening due...

متن کامل

Thin Discs, Thick Discs and Transition Zones

Accretion onto a compact object must occur through a disc when the material has some initial angular momentum. Thin discs and the thicker low radiative efficiency accretion flows (LRAFs) are solutions to this problem that have been widely studied and applied. This is an introduction to these accretion flows within the context of X-ray binaries and cataclysmic variables. Accretion describes the ...

متن کامل

Weighing the young stellar discs around Sgr A ∗

It is believed that young massive stars orbiting Sgr A∗ in two stellar discs on scales of ∼ 0.1 − 0.2 parsecs were formed either farther out in the Galaxy and then quickly migrated inward, or in situ in a massive self-gravitating disc. Comparing N-body evolution of stellar orbits with observational constraints, we set upper limits on the masses of the two stellar systems. These masses turn out ...

متن کامل

Low and high velocity SiO emission around young stellar objects

We present a multiline mm-wave survey of SiO emission towards a sample of star-forming regions associated with molecular and Herbig-Haro outflows. The sample includes sources in the northern and southern hemispheres. We extensively mapped some particularly interesting objects (IRAS 00338+6312, HH7–11 and CepA). The high detection rate in the sample (52%) confirms that the SiO emission is closel...

متن کامل

Long-term evolution of FU Orionis objects at infrared wavelengths

We investigate the brightness evolution of 7 FU Orionis systems in the 1−100μm wavelength range using data from the Infrared Space Observatory (ISO). The ISO measurements were supplemented with 2MASS and MSX observations performed in the same years as the ISO mission (1995−98). The spectral energy distributions (SEDs) based on these data points were compared with earlier ones derived from the I...

متن کامل

ذخیره 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: Monthly Notices of the Royal Astronomical Society

سال: 2012

ISSN: 0035-8711

DOI: 10.1111/j.1365-2966.2012.21076.x