681 citations · 7k across the 112 of their papers we have counts for
12 papers · 1 filter
Evolution of tidal disruption candidates discovered by XMM-Newton
P. Esquej, R. D. Saxton, S. Komossa +8
It has been demonstrated that active galactic nuclei are powered by gas accretion onto supermassive black holes located at their centres. The paradigm that the nuclei of inactive g…
A search for diffuse bands in the circumstellar envelopes of post-AGB stars
R. Luna, N. L. J. Cox, M. A. Satorre +3
In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in the circumstellar envelopes of a carefully selected sample of post-AGB stars. We co…
Spitzer/IRS spectroscopy of high mass precursors to planetary nebulae
D. A. Garcia-Hernandez, J. V. Perea-Calderon, M. Bobrowsky +1
We present Spitzer/IRS observations of a small sample of heavily obscured IRAS sources displaying both the infrared and OH maser emission characteristic of OH/IR stars on the asymp…
High resolution spectroscopy of the high velocity hot post-AGB star LS III +52 24 (IRAS 22023+5249)
G. Sarkar, M. Parthasarathy, P. Garcia-Lario
Aims: To investigate the first high resolution optical spectrum of the B-type star, LS III +52 24, identified as the optical counterpart of the hot post-AGB candidate IRAS 22023+52…
Rubidium-Rich Asymptotic Giant Branch Stars
D. A. Garcia-Hernandez, P. Garcia-Lario, B. Plez +3
A long debated issue concerning the nucleosynthesis of neutron-rich elements in Asymptotic Giant Branch (AGB) stars is the identification of the neutron source. We report intermedi…
Lithium and zirconium abundances in massive Galactic O-rich AGB stars
D. A. Garcia-Hernandez, P. Garcia-Lario, B. Plez +4
Lithium and zirconium abundances (the latter taken as representative for s-process enrichment) are determined for a large sample of massive Galactic O-rich AGB stars, for which hig…
Spitzer Spectra of Magellanic Cloud PNe
L. Stanghellini, P. Garcia Lario, A. Manchado +4
Planetary nebulae (PNe) in the Magellanic Clouds (LMC, SMC) offer a unique opportunity to study both the population and evolution of low- and intermediate-mass stars in an environm…
High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)
D. A. Garcia-Hernandez, C. Abia, A. Manchado +1
We present high resolution optical spectroscopic observations of IRAS 09425-6040, a peculiar, extremely red, C-rich AGB star showing prominent O-rich dust features in its ISO infra…
Revealing the mid-infrared emission structure of IRAS 16594-4656 and IRAS 07027-7934
D. A. Garcia-Hernandez, A. Manchado, P. Garcia-Lario +3
TIMMI2 diffraction-limited mid-infrared images of a multipolar proto-planetary nebula IRAS 16594-4656 and a young [WC] elliptical planetary nebula IRAS 07027-7934 are presented. Th…
Why are massive O-rich AGB stars in our Galaxy not S-stars?
D. A. Garcia-Hernandez, P. Garcia-Lario, B. Plez +4
We present the main results derived from a chemical analysis carried out on a large sample of galactic O-rich AGB stars using high resolution optical spectroscopy (R~40,000-50,000)…
The Mid-IR Emission Structure of IRAS 16594-4656
D. A. Garcia-Hernandez, A. Manchado, P. Garcia-Lario +3
We report TIMMI2 diffraction-limited mid-IR images of the multipolar PPN IRAS 16594-4656. By using the Lucy-Richardson deconvolution algorithm we recover a two-peaked morphology in…
Near-IR spectroscopy of planetary nebulae precursors
D. A. Garcia-Hernandez, A. Manchado, P. Garcia-Lario +3
We present near-IR spectroscopy of a sample of 30 IRAS sources recently identified as late AGB stars, post-AGB stars or early PNe. The spectra obtained are centered at various wave…