Stars on the run: escaping from stellar clusters
نویسندگان
چکیده
منابع مشابه
Mass Loss from Stars and the Evolution of Stellar Clusters
New NTT/SOFI near-IR narrow-band imaging and spectroscopy reveals an additional four Wolf-Rayet (WR) stars in the massive cluster Westerlund 1, bringing the total WR population to 24. Sixteen of the WR stars in Wd1 have been classified WN5–11, while eight are WC8–9. An observed WR to RSG/YHG ratio of ∼3 suggests an age of 4.5–5.0 Myr, with WR stars descended from 40–55M⊙ progenitors. On the bas...
متن کاملStellar Winds from Massive Stars
We review the various techniques through which wind properties of massive stars – O stars, AB supergiants, Luminous Blue Variables (LBVs), Wolf-Rayet (WR) stars and cool supergiants – are derived. The wind momentum-luminosity relation (e.g. Kudritzki et al. 1999) provides a method of predicting mass-loss rates of O stars and blue supergiants which is superior to previous parameterizations. Assu...
متن کاملStellar Collisions in Young Clusters: Formation of (Very) Massive Stars?
In young star clusters, the density can be high enough and the velocity dispersion low enough for stars to collide and merge with a significant probability. This has been suggested as a possible way to build up the highmass portion of the stellar mass function and as a mechanism leading to the formation of one or two very massive stars (M∗ > 150M⊙) through a collisional runaway. I quickly revie...
متن کاملX-Ray Properties of Young Stars and Stellar Clusters
Although the environments of star and planet formation are thermodynamically cold, substantial X-ray emission from 10–100 MK plasmas is present. In low-mass pre-main-sequence stars, X-rays are produced by violent magnetic reconnection flares. In high-mass O stars, they are produced by wind shocks on both stellar and parsec scales. The recent Chandra Orion Ultradeep Project, XMM-Newton Extended ...
متن کاملProperties of Stellar Clusters around High-Mass Young Stars
Context. Twenty-six high-luminosity IRAS sources believed to be collection of stars in the early phases of high-mass star formation have been observed in the Near-IR (J, H, Ks) to characterize the clustering properties of their young stellar population and compare them with those of more evolved objects (e.g., Herbig Ae/Be stars) of comparable mass. All the observed sources possess strong conti...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2013
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stt1190