5 papers
On the stellar parameter dependence of the combined Fe I and Fe II chromospheric emission-line in the wings of the Ca II K line
Faiber Rosas-Portilla, Luis Zapata, Klaus-Peter Schröder +3
We present an analysis of the chromospheric emission of Fe I + Fe II in the wing of the Ca II K line of 21 G and K giant stars. Stellar parameters and absolute chromospheric fluxes…
A VLA search for compact radio sources in the explosive molecular outflows DR 21 and G5.89
Vanessa Yanza, Sergio A. Dzib, Aina Palau +3
We present high-angular-resolution () VLA Ku-band (12--18 GHz) observations of two explosive molecular outflows (EMOs), DR 21 and G5.89, in a search for runaway s…
Upper Limits to the Proper Motions of JuMBO 24, a Jupiter-Mass Binary Object Candidate in Orion
Luis F. Rodriguez, Laurent Loinard, Luis Zapata +1
Using JWST near-infrared data of the inner Orion Nebula, \citet{Pearson_McCaughrean_2023} detected 40 binary systems they proposed to be Jupiter-Mass Binary Objects (JuMBOs) -- alt…
Radio Proper Motions and a Search for the Origin of PSR B1849+00
Luis F. Rodriguez, Sergio A. Dzib, Luis A. Zapata +1
Until now it has not been possible to obtain the proper motions of PSR B1849+00 with timing techniques or VLBI imaging given the enhanced interstellar scattering along its line of…
The Radio Continuum Source Projected Near HR 8799
Luis F. Rodriguez, Luis A. Zapata
HR 8799 is an A5/F0 V star where exoplanets were first directly imaged. Four exoplanets were found within from the star. Here we report the VLA detection of a…