[PDF] Top 20 The lower main sequence and the atmospheres of M dwarfs

... Similarly, the weak line However, for strong lines pressure broadening counteracts these trends in cooler and denser atmospheres, reversing the gravity dependence at about the main seque[r] ... See full document

... Brown dwarfs become increasingly dimmer as they age because their mass is too small to sustain continuous hydrogen ...brown dwarfs fuse some helium and maybe ...brown dwarfs comprises members that ... See full document

... brown dwarfs, which are very similar to planets with respect to their physical param- eters and atmospheric ...brown dwarfs (Y dwarfs) reach e ff ective temperatures as low as 250 K (Leggett et ... See full document

... brown dwarfs and giant gas planets and a highly ionised gas in the younger brown dwarfs or ...brown dwarfs. They model the spectra of three brown dwarfs (with H α emissions) assuming a ... See full document

... ˙ m < 10 −3 g cm −2 s −1 ...the lower atmosphere but create a hot corona and the atmosphere below is again heated radiatively (Thomson & Cawthorne 1987; Woelk & Beuermann ...of atmospheres ... See full document

... Thermal ionisation in brown dwarf and giant gas planet at- mospheres with local temperatures between 100K . . . 4000K and high local gas pressures between 10 −7 bar . . . 5bar al- lows for electrostatic interactions and ... See full document

... Whilst main-sequence stars are tidally disrupted when approaching the central MBH, compact objects (stellar black holes, neutron stars, and white dwarfs) slowly spiral into the MBH and are swallowed ... See full document

... brown dwarfs and planets form clouds in their atmo- ...dwarf atmospheres was triggered by the disappearance of metal-oxide band (like TiO and VO) with decreasing effective temperature (see Kirkpatrick ... See full document

... Figure 2 compares our simulation at ∼ 7500 K and log g = 5.0 with the simulation at ∼ 9500 K and log g = 7.0 from Tremblay et al. ( 2013c ) . Both simulations have a similar relative intensity contrast and granulation is ... See full document

... does lower the sur- face gravities at low effective temperatures, yet the authors find that gravity is very sensitive to the exact treatment of this ...white dwarfs (Bergeron et ...model atmospheres ... See full document

... The key to this puzzle may lie in the dust clouds that begin to form in low-mass stars at around the same effective temperature range where thermal ionization processes die away. Within the solar system, cloud-covered ... See full document

... much lower temperatures and masses of brown dwarfs compared to solar-type pre-main sequence stars may cause differences in the evolution of accretion, disk composition and grain ...much ... See full document

... of main sequence and giant stars are discernible enough to fit discrete ...the main sequence or ...to M dwarfs of known spectral types from catalogues published by West et ... See full document

... white dwarfs, we fitted the He-models to the observed ugriz magnitudes, which were corrected to the AB scale by using the corrections suggested by the SDSS project ...white dwarfs is currently unconstrained ... See full document

... model atmospheres and the mass-radius relation of DA ...theoretical sequence (Fontaine et ...white dwarfs observed in the Gaia mission (Catal´an et ... See full document

... contaminated atmospheres of 25-50% of white dwarfs, arising from the accretion of planetary material (5,6), (ii) compact dust discs (7, 8), formed from the rubble of tidally disrupted planetesimals (9, 10), ... See full document

... In order to decide definitely that the present example was not merely an apparently equal development of the main stem and of an axillary shoot a study of the anatomy was made. % indic[r] ... See full document

... white dwarfs with detailed abundance studies of 22 warmer and younger debris-polluted white dwarfs which are often assumed to be in accretion-diffusion ... See full document

... In support of this explanation of the differences between Brown and Morris' results and our own, several facts may be adduced. In Brown and Morris' experiments the proportion of starch i[r] ... See full document

... pesticides, cyanide from wineries and the share of communal unauthorized ramps dropped by 30%. In a few localities the following were initiated: the separate collection of communal waste, landscaping livestock for biogas ... See full document