منابع مشابه
Rotation and variability of young very low mass objects
Variability studies are an important tool to investigate key properties of stars and brown dwarfs. From photometric monitoring we are able to obtain information about rotation and magnetic activity, which are expected to change in the mass range below 0.3 solar masses, since these fully convective objects cannot host a solar-type dynamo. On the other hand, spectroscopic variability information ...
متن کاملProbing Episodic Accretion in Very Low Luminosity Objects
Episodic accretion has been proposed as a solution to the long-standing luminosity problem in star formation; however, the process remains poorly understood. We present observations of line emission from N2H + and CO isotopologues using the Atacama Large Millimeter/submillimeter Array (ALMA) in the envelopes of eight very low luminosity objects (VeLLOs). In five of the sources the spatial distr...
متن کاملRotation and accretion of very low mass objects in the σ Ori cluster ⋆
We report on two photometric monitoring campaigns of Very Low Mass (VLM) objects in the young open cluster around σ Orionis. Our targets were pre-selected with multi-filter photometry in a field of 0.36 sqdeg. For 23 of these objects, spanning a mass range from 0.03 to 0.7M⊙, we detect periodic variability. Of these, 16 exhibit low-level variability, with amplitudes of less than 0.2 mag in the ...
متن کاملEmission line diagnostics for accretion and outflows in young very low-mass stars and brown dwarfs
We discuss accretion and outflow properties of three very low-mass young stellar objects based on broad-band mid-resolution X-Shooter/VLT spectra. Our targets (FUTauA, 2M1207-39, and Par-Lup3-4) have spectral types between M5 and M8, ages between 1Myr and ∼ 10Myr, and are known to be accreting from previous studies. The final objective of our project is the determination of mass outflow to accr...
متن کاملUv Excess Measures of Accretion onto Young Very Low-mass Stars and Brown Dwarfs
Low-resolution spectra from 3000–9000 Å of young low-mass stars and brown dwarfs were obtained with LRIS on Keck I. The excess UV and optical emission arising in the Balmer and Paschen continua yields mass accretion rates ranging from 2×10 to 10 M⊙ yr . These results are compared with HST/STIS spectra of roughly solar-mass accretors with accretion rates that range from 2× 10 to 5 × 10 M⊙ yr . T...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900210450