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Multitechnique testing of the viscous decretion disk model I. The stable and tenuous disk of the late-type Be star CMi
R. Klement, A. C. Carciofi, T. Rivinius +10
The viscous decretion disk (VDD) model is able to explain most of the currently observable properties of the circumstellar disks of Be stars. However, more stringent tests, focusin…
GW Ori: Inner disk readjustments in a triple system
M. Fang, A. Sicilia-Aguilar, V. Roccatagliata +4
(abridged) We study the young stellar system GW Ori, concentrating on its accretion/wind activity by using our high-resolution optical spectra and -band photometry. We also char…
Radial velocity variations in the young eruptive star EX Lup
Á. Kóspál, M. Mohler-Fischer, A. Sicilia-Aguilar +7
EX Lup-type objects (EXors) are low-mass pre-main sequence objects characterized by outbursts attributed to highly enhanced disk accretion. The trigger mechanism of EXor outbursts…
A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
Beth Biller, Sylvestre Lacour, Attila Juhász +11
With the uniquely high contrast within 0.1" (Δmag(L') = 5-6.5 magnitudes) available using Sparse Aperture Masking (SAM) with NACO at VLT, we detected asymmetry in the flux from the…
Orbit of the young very low-mass spectroscopic binary CHXR 74
V. Joergens, M. Janson, A. Müller
The pre-main sequence star CHXR74 (M4.25) in ChaI was detected a few years ago to be a very low-mass spectroscopic binary. Determination of its mass would provide a valuable dynami…
HD 144432: a young triple system
A. Mueller, A. Carmona, M. E. van den Ancker +3
We present new imaging and spectroscopic data of the young Herbig star HD 144432 A, which was known to be a binary star with a separation of 1.47 arcsec. High-resolution NIR imagin…