116 citations · 1.6k across the 50 of their papers we have counts for
51 papers
The Molecular Circumstellar Environments of Red Supergiants in Galactic Open Clusters
Mark A. Siebert, Elvire De Beck, Guillermo Quintana-Lacaci +4
We aim to expand the sample of RSGs with direct measurements of circumstellar gas through millimeter observations of two of the largest coeval RSG populations in the Galaxy: the op…
The Last Gasps of a Dying Star: ALMA Observations of the Pre-Planetary Nebula IRAS 06530-0213
Raghvendra Sahai, Wouter Vlemmings, Guillermo Quintana-Lacaci +16
We present high angular-resolution () ALMA observations of millimeter-wave line and continuum emission (at and mm) in the pre-planetary ne…
The formation radius of HCN in O-rich asymptotic giant branch stars
L. Marinho, J. P. Fonfría, M. Agúndez +3
Molecules detected in circumstellar envelopes around asymptotic giant branch (AGB) stars are generally well explained in terms of formation under chemical equilibrium in the stella…
Chemistry in the High expansion-velocity C-rich evolved star AFGL2233. Isotopic ratios, peculiarities and evolutionary status
G. Quintana-Lacaci, M. Agúndez, L. Velilla-Prieto +4
High expansion velocity carbon stars (HVCs) are a rare class of evolved stars whose circumstellar envelopes (CSEs) combine C-rich chemistry with unusually high expansion velocities…
The circumstellar environment around the extreme Galactic red supergiant NML Cygni: Dense, dusty, and asymmetric
E. De Beck, H. Andrews, G. Quintana-Lacaci +1
Supernova observations imply the presence of a dense and asymmetric circumstellar environment around SN Type II progenitors, whereas the mass loss from these progenitors, namely, r…
Exploring circumstellar chemistry in X-ray emitting AGB stars
J. Alonso-Hernández, C. Sánchez Contreras, M. Agúndez +5
Aims. Our goal is to characterize the chemistry and physical conditions of the circumstellar envelopes (CSEs) of Asymptotic Giant Branch (AGB) binary candidate stars with UV-excess…