85 citations · 532 across the 15 of their papers we have counts for
15 papers
Nearby Young, Active, Late-type Dwarfs in Gaia's First Data Release
Joel H. Kastner, Germano Sacco, David Rodriguez +3
The Galex Nearby Young Star Survey (GALNYSS) has yielded a sample of 2000 UV-selected objects that are candidate nearby (150 pc), young (age 10--1…
The Multiple Young Stellar Objects of HBC 515: An X-ray and Millimeter-wave Imaging Study in (Pre-main Sequence) Diversity
D. A. Principe, G. G. Sacco, J. H. Kastner +3
We present Chandra X-ray Observatory and Submillimeter Array (SMA) imaging of HBC 515, a system consisting of multiple young stellar objects (YSOs). The five members of HBC 515 rep…
Evidence for Variable, Correlated X-ray and Optical/IR Extinction toward the Nearby, Pre-main Sequence Binary TWA 30
David A. Principe, G. G. Sacco, Joel H. Kastner +2
We present contemporaneous XMM-Newton X-ray and ground-based optical/near-IR spectroscopic observations of the nearby ( pc), low-mass (mid-M) binary system TWA 30A an…
Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440-6810 A in the gamma Vel cluster, and calibration of spectral indices
F. Damiani, L. Prisinzano, G. Micela +23
We study spectral diagnostics available from optical spectra with R=17000 obtained with the VLT/Giraffe HR15n setup, using observations from the Gaia-ESO Survey, on the gamma Vel y…
Molecules in the transition disk orbiting T Cha
G. G. Sacco, J. H. Kastner, T. Forveille +4
We seek to establish the presence and properties of gas in the circumstellar disk orbiting T Cha, a nearby (d~110 pc), relatively evolved (age ~5-7 Myr) yet actively accreting 1.5…
The magnetosphere of the close accreting PMS binary V4046 Sgr AB
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
We present a preliminary 3D potential field extrapolation model of the joint magnetosphere of the close accreting PMS binary V4046 Sgr. The model is derived from magnetic maps obta…
The magnetosphere of the close accreting PMS binary V4046 Sgr
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
V4046 Sagittarii AB is a close short-period classical T Tauri binary. It is a circularised and synchronised system accreting from a circumbinary disk. In 2009 it was observed as pa…
The close T Tauri binary system V4046 Sgr: Rotationally modulated X-ray emission from accretion shocks
C. Argiroffi, A. Maggio, T. Montmerle +11
We report initial results from a quasi-simultaneous X-ray/optical observing campaign targeting V4046 Sgr, a close, synchronous-rotating classical T Tauri star (CTTS) binary in whic…
GSC 07396-00759 = V4046 Sgr C[D]: a Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB
J. H. Kastner, G. G. Sacco, R. Montez +13
We explore the possibility that GSC 07396-00759 (spectral type M1e) is a widely separated (~2.82', or projected separation ~12,350 AU) companion to the "old" (age ~12 Myr) classica…
The close classical T Tauri binary V4046 Sgr: Complex magnetic fields & distributed mass accretion
J. F. Donati, S. G. Gregory, T. Montmerle +12
We report here the first results of a multi-wavelength campaign focussing on magnetospheric accretion processes within the close binary system V4046 Sgr, hosting two partly-convect…
Multi-wavelength diagnostics of accretion in an X-ray selected sample of CTTSs
R. L. Curran, C. Argiroffi, G. G. Sacco +5
High resolution X-ray spectroscopy has revealed soft X-rays from high density plasma in Classical T-Tauri stars (CTTSs), probably arising from the accretion shock region. However,…
On the observability of T Tauri accretion shocks in the X-ray band
G. G. Sacco, S. Orlando, C. Argiroffi +4
Context. High resolution X-ray observations of classical T Tauri stars (CTTSs) show a soft X-ray excess due to high density plasma (n_e=10^11-10^13 cm^-3). This emission has been a…
X-ray emitting MHD accretion shocks in classical T Tauri stars. Case for moderate to high plasma-beta values
S. Orlando, G. G. Sacco, C. Argiroffi +3
AIMS. We investigate the stability and dynamics of accretion shocks in CTTSs, considering the case of beta >= 1 in the post-shock region. In these cases the 1D approximation is not…
X-ray emission from dense plasma in CTTSs: Hydrodynamic modeling of the accretion shock
G. G. Sacco, C. Argiroffi, S. Orlando +3
High spectral resolution X-ray observations of CTTSs demonstrate the presence of plasma at T~2-3X10^6 K and n_e~10^11-10^13 cm^-3, unobserved in non-accreting stars. Stationary mod…
Optical spectroscopy of X-ray sources in the Taurus molecular cloud: discovery of ten new pre-main sequence stars
L. Scelsi, G. Sacco, L. Affer +4
We have analyzed optical spectra of 25 X-ray sources identified as potential new members of the Taurus molecular cloud (TMC), in order to confirm their membership in this SFR. Fift…