H. Monteiro

Stellar Multiplicity in Open Clusters: Investigating Binary Fractions and Their Relationship with Cluster Properties

Ruan P. Alves, H. Monteiro, W. S. Dias, Gabriel R. Hickel

Abstract Stellar multiplicity is key in dynamical evolution of open clusters (OCs) and processes of stellar formation and evolution. Since most stars form in multiple systems, investigating how environmental properties affect their occurrence is crucial. We aim to investigate how binary fraction …

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Recalibration of the H α Surface Brightness–Radius Relation for Planetary Nebulae Using Gaia DR3: New Distances and the Milky Way Oxygen Radial Gradient

O. Cavichia, H. Monteiro, M. Cerviño, Adalberto R. da Cunha-Silva et autres

Abstract The spatial distribution of chemical elements in the Galactic disk provides key constraints on models of galaxy evolution. However, studies using planetary nebulae (PNe) as tracers have been historically limited by large uncertainties in their distances. To overcome the long-standing distance …

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Detection of CO 2 ice in the planetary nebula NGC 6302

Charmi Bhatt, S. W. Cao, J. Cami, N. Clark et autres

Using JWST/MIRI observations, we report the detection of CO 2 ice in the dusty torus of the planetary nebula NGC 6302, an environment generally considered hostile to fragile molecular species and ices due to intense UV irradiation. This detection accompanies cold (20–50 …

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Discovery of 178 Open Clusters with Gaia DR3

W. S. Dias, H. Monteiro, B. S. Alessi, J. R. D. Lépine et autres

Abstract We present 178 new open cluster candidates identified through the application of the HDBSCAN clustering algorithm to astrometric data from the Gaia DR3 catalog. The analysis was performed over 5770 1 deg 2 fields centered on OB stars, which serve as …

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Detection of CH 3 + in the O-rich Planetary Nebula NGC 6302

Charmi Bhatt, J. Cami, E. Peeters, Nicholas Clark et autres

Abstract Planetary nebulae are sites where ejected stellar material evolves into complex molecules, but the precise physical conditions and chemical routes that govern these processes are unclear. The presence of abundant carbon-rich molecules in O-rich environments poses particular challenges. Here we report …

Recalibration of the H$α$ surface brightness-radius relation for planetary nebulae using Gaia DR3: new distances and the Milky Way oxygen radial gradient

O. Cavichia, H. Monteiro, Adalberto R. da Cunha-Silva, António Cardoso

The spatial distribution of chemical elements in the Galactic disk provides key constraints on models of galaxy evolution. However, studies using planetary nebulae (PNe) as tracers have been historically limited by large uncertainties in their distances. To overcome the long-standing distance uncertainties, …

Detection of CH3+ in the O-rich planetary nebula NGC 6302

Charmi Bhatt, J. Cami, E. Peeters, Nicholas Clark et autres

Planetary nebulae are sites where ejected stellar material evolves into complex molecules, but the precise physical conditions and chemical routes that govern these processes are unclear. The presence of abundant carbon-rich molecules in O-rich environments poses particular challenges. Here we report the …

ca, us, nl, se, gb, br, fr, be, tw, ie, es, au (code pays fourni par la source)

The JWST/MIRI view of the planetary nebula NGC 6302 – I. A UV-irradiated torus and a hot bubble triggering PAH formation

M. Matsuura, Kevin Volk, Patrick Kavanagh, Bruce Balick et autres

ABSTRACT NGC 6302 is a spectacular bipolar planetary nebula (PN) whose spectrum exhibits fast outflows and highly ionized emission lines, indicating the presence of a very hot central star (${\sim}$220 000 K). Its infrared spectrum reveals a mixed oxygen and carbon dust …

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Estimating the Impact of an Electromagnetic Pulse Caused by a Hypothetical Surface-Level Nuclear Explosion on Urban Critical Infrastructure

Rocco Pascale Neto, Gustavo G. Souza, Eduarda Victória S. L. Andrade, A. B. Pavan et autres

This study explores the immediate effects of an electromagnetic pulse (EMP) caused by a hypothetical activation of a nuclear device in an urban area. It aims to conservatively evaluate the impact of the EMP beyond its effective ionization radius by estimating electric …

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Dissecting NGC 3132: tracing the mass-loss history of the southern ring planetary nebula

K. Bouvis, S. Akras, H. Monteiro, L. Konstantinou et autres

ABSTRACT Central to our understanding of stellar evolution and its impact on processes in our Galaxy and across the Universe is the study of mass-loss. While the general framework is well established, recent JWST observations of objects like NGC 3132 have revealed …

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Integral field spectroscopy of the planetary nebula NGC 3242 and the puzzling nature of its low-ionization structures

L. Konstantinou, S. Akras, J. García–Rojas, K. Bouvis et autres

Context. We investigate the physico-chemical properties of the planetary nebula (PN) NGC 3242 in both 1D and 2D, using integral field unit (IFU) data. This PN has a complex morphology with multiple shells and contains a pair of structures with a lower …

The planetary nebula NGC 3132 revisited: high definition 3D photoionization model

H. Monteiro, C. Mendes de Oliveira, P. Amram, Letizia Stanghellini et autres

ABSTRACT We present a detailed 3D photoionization model of the planetary nebula NGC 3132, constrained by the latest observations. Using the mocassin code, the model incorporates integrated and spatially resolved spectroscopy, velocity-resolved line profiles, emission line maps, and photometry, including recent high-quality …

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