[PDF] Top 20 On the gas temperature in circumstellar disks around A stars

... these circumstellar disks, gas and dust are momentum coupled (Gilman 1972) and we assume that all the momentum gained by the grains from the radi- ation field is transferred to the gas by ... See full document

... young stars and their circumstellar disks are imperative in understanding the multitude of astrophysical processes during the evolution of a young ... See full document

... Circumstellar disks play an essential role in the under- standing of the formation of planetary systems such as our own (see Beckwith 1999; Beckwith & Sargent 1996 for recent ...protoplanetary ... See full document

... the circumstellar disks surrounding Herbig Ae / Be ...Ae/Be stars and resolved all ...sample stars correlate with the slope of the 10–25 µm infrared spectrum in the sense that the reddest ... See full document

... standard stars served to correct for atmospheric absorption. Stars of type A and earlier were chosen because of their relatively few photospheric features at 5 ...cooler stars do have prominent Pfβ ... See full document

... from circumstellar disks and ...by circumstellar material which could result in their detection primarily in scattered ...low-lying stars on the HR diagram of IC ...of stars at ... See full document

... may hinder the cores from collapsing, although the thermal Jeans-mass is reached, e.g., rotation, turbulence, and magnetic fields. The e ff ect of rotation does not seem to hinder the initial collapse of molecular cores ... See full document

... (PMS) stars respectively (Acke & van den Ancker 2004; Geers et ...the circumstellar disks (Ressler & Barsony 2003; Habart et ...with circumstellar disk is still embedded in an envelope ... See full document

... of disks surrounding low-mass stars (Johnstone et ...of disks and an important factor in any subsequent plane- tary ...the gas material becomes gravi- tationally ...evaporate ... See full document

... observe circumstellar disks around other ...erent circumstellar systems can provide us with information of how and where planets form in ...in disks are an excellent approach to detect ... See full document

... of gas-phase reactions for 94 atomic, ionic, and molecular species, involving water and related ...eratively. Gas heating via exothermic reactions is approximated via the chemical heating efficiency (Woitke ... See full document

... atomic gas; hence, the emission seen in the spectrum can arise from a large extended ...molecular gas is expected. As the temperature decreases, thee conditions are viable for the dust to exist and a ... See full document

... that gas became totally ...the disks are dense enough to develop a cool region in the equatorial plane, the hydrostatic enforced disks have material concentrated in a thinner volume towards the plane ... See full document

... The first interesting thing to come out of the resolved images was that the size of the NIR region is larger than model predictions (Monnier & Millan-Gabet 2002; Tuthill et al. 2001). This observation implies that ... See full document

... M stars represent the best targets for the discovery and characterization of potentially habitable exoplanets, but low-mass pre-main sequence stars are characterized by intense high energy radiation and a ... See full document

... the circumstellar mate- rial will become diluted and more transparent, which would clearly increase the importance of ...the circumstellar benzene into ...circumbinary disks are indeed found to be ... See full document

... of disks around young stars, deriving radial Richardson Numbers and thermal relaxation ...in disks around young stars and its implications on the planet formation ... See full document

... total gas content in disks we rely on indirect ...total gas is either estimated from the dust content, or from observations of ...vertical gas content of ...the disks and renders it ... See full document

... We cross-correlated the ERSO sample of IPHAS sources with objects in the 2 Micron All Sky Survey (2MASS, Skrutskie et al. 2006), the Infrared Astronomi- cal Satellite survey (IRAS, Neugebauer et al. 1984), the Midcourse ... See full document

... coolest stars in the sample (HD 23362, K2V; HD 98800, K5Ve; HD 123160, G5V; HD 143006, G5Ve) it has been found th a t HD 23362 has no detectable lithium at this ...for stars of similar type in the Pleiades ... See full document