Pre-main-sequence stars in the star-forming complex Sh 2-284
نویسندگان
چکیده
منابع مشابه
Proper motions of pre-main sequence stars in southern star-forming regions
We present proper motion measurements of premain sequence (PMS) stars associated with major star-forming regions of the southern hemisphere (Chamaeleon, Lupus, Upper Scorpius Ophiuchus, Corona Australis), situated in the galactic longitude range l = 290◦ to l = 360◦. A list of PMS stars as complete as possible was established based on the Herbig and Bell catalogue and many new catalogues like t...
متن کاملFundamental properties of pre-main sequence stars in young, southern star forming regions: metallicities The Weak-Lined T-Tauri Stars
Aims. The primary motivation for this project is to search for metal-rich star forming regions, in which, stars of super-solar metallicity will be created, as hopefully, will be extra-solar planets orbiting them ! The two aims of this project are: 1: to show that our sample stars are young, lithium rich, magnetically active and non-accreting kinematic members of their respective regions. 2: To ...
متن کاملThe Ages of Pre-main-sequence Stars
The position of pre-main-sequence or protostars in the Hertzsprung–Russell diagram is often used to determine their mass and age by comparison with pre-main-sequence evolution tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate. However, the age determination can be very misleading because it is s...
متن کاملMagnetic flaring in pre-main sequence stars
Observations of nearby star forming clouds with imaging Xray telescopes have revealed that X-ray emission is elevated 10 − 10 above main sequence levels in low-mass pre-main sequence (PMS) stars. The variability and spectral X-ray evidence, together with circularly polarized radio continuum flares seen in a few cases, strongly argues for an origin in magnetic reconnection flares. These high lev...
متن کاملCircumstellar Disks in pre-Main–Sequence Stars
This review covers the properties of disks around pre-main– sequence stars. It is at this time in the evolution that planets form, and it is important to understand the properties of these disks to understand planet formation. I discuss disk shapes, masses and temperatures, the properties of the host stars, disk lifetimes and dissipation processes. Finally, evidence of grain growth during pre-m...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.17438.x