Measurement of interstellar extinction in emission line stars

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

Direct Measurement of Interstellar Extinction toward Young Stars Using Atomic Hydrogen Lyman-α Absorption

Interstellar reddening corrections are necessary to reconstruct the intrinsic spectral energy distributions (SEDs) of accreting protostellar systems. The stellar SED determines the heating and chemical processes that can occur in circumstellar disks. Measurement of neutral hydrogen absorption against broad Lyman-α emission profiles in young stars can be used to obtain the total H I column densi...

متن کامل

The Weak Emission Line Stars

In this paper, we study the evolution of the weak emission line central stars of planetary nebula (WELS), which are similar to the H-deficient Wolf-Rayet central stars except for systematically weaker emission lines. Our attempts at finding an evolutionary sequence for the WELS similar to what was established for Wolf-Rayet central stars, were unsuccessful. No correlation was found between any ...

متن کامل

Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints

We present new interstellar dust models which have been derived by simultaneously fitting the far–ultraviolet to near–infrared extinction, the diffuse infrared (IR) emission and, unlike previous models, the elemental abundance constraints on the dust for different interstellar medium abundances, including solar, F and G star, and B star abundances. The fitting problem is a typical ill-posed inv...

متن کامل

Planetary nebulae with emission - line central stars

The kinematic structure of a sample of planetary nebulae, consisting of 23 [WR] central stars, 21 weak emission line stars (wels) and 57 non-emission line central stars, is studied. The [WR] stars are shown to be surrounded by turbulent nebulae, a characteristic shared by some wels but almost completely absent from the non-emission line stars. The fraction of objects showing turbulence for non-...

متن کامل

Mid{infrared Rotational Line Emission from Interstellar Molecular Hydrogen

We have modeled the line emission from the v=0{0 S(0), S(1), S(2) and S(3), and the v=1{0 and v=2{1 S(1) transitions of molecular hydrogen in clouds exposed to high far{ultraviolet uxes (i.e., photodissociation regions or PDRs) and in shocks. In particular, we have studied the lowest pure rotational H2 transitions (the 0{0 S(0) and 0{0 S(1) lines), at 28 m and 17 m respectively. We nd that, in ...

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: Symposium - International Astronomical Union

سال: 1970

ISSN: 0074-1809

DOI: 10.1017/s0074180900101834