Dolei, Sergio Bemporad, Alessandro Spadaro, Daniele
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ScienceOpen Astronomy & Astrophysics
In this work we study the kinematics of three small-scale (0.01 R⊙) blobs of chromospheric plasma falling back to the Sun after the huge eruptive event of June 7, 2011. From a study of 3D trajectories of blobs made with the Solar TErrestrial RElations Observatory (STEREO) data, we demonstrate the existence of a significant drag force acting on the ...
De Val-Borro, M Artymowicz, P Angelo, G Peplinski, A
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ScienceOpen Astronomy & Astrophysics
Boccaletti, A Chauvin, G Lagrange, A-M Franck Marchis
Published in
ScienceOpen Astronomy & Astrophysics
This article presents coronagraphic images of the low-mass companion to the star HR 7672 observed at the Palomar 200 inch telescope and first detected at Gemini and Keck in the K band by Liu et al.(2002). We obtained additional photometry in J ($1.2~\ mu $ m), H ($1.6~\ mu $ m) and $ K_ \ rm s $($2.2~\ mu $ m) bands to cover the full near-IR domain...
Da Silva, Pinheiro Auvergne, M Toublanc, D Jason Rowe Kuschnig, R Matthews, J
Published in
ScienceOpen Astronomy & Astrophysics
Context. Fitting photometry algorithms can be very effective provided that an accurate model of the instrumental point spread function (PSF) is available. When high- precision time-resolved photometry is required, however, the use of point-source star images as empirical PSF models can be unsatisfactory, due to the limits in their spatial resolutio...
Kervella, Pierre Verhoelst, Tijl Ridgway, Stephen T Perrin, Guy Lacour, Sylvestre Jan Cami Haubois, Xavier
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ScienceOpen Astronomy & Astrophysics
Context. Betelgeuse is one the largest stars in the sky in terms of angular diameter. Structures on the stellar photosphere have been detected in the visible and near-infrared as well as a compact molecular environment called the MOLsphere. Mid-infrared observations have revealed the nature of some of the molecules in the MOLsphere, some being the ...
Cox, Nlj Cordiner, M A Ehrenfreund, P Kaper, L Sarre, P J Foing, B H Spaans, M Jan Cami Sofia, U J Clayton, G C
...
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ScienceOpen Astronomy & Astrophysics
Aims. In order to gain new insight into the unidentified identity of the diffuse interstellar band (DIB) carriers, this paper describes research into possible links between the shape of the interstellar extinction curve (including the 2175 Å bump and far-UV rise), the presence or absence of DIBs, and physical and chemical conditions of the diffuse ...
Gielen, Clio Jan Cami Bouwman, J Els Peeters Min, M
Published in
ScienceOpen Astronomy & Astrophysics
Context. The circumstellar environment of evolved stars is generally rich in molecular gas and dust. Typically, the entire environment is either oxygen-rich or carbon- rich, depending on the evolution of the central star. Aims. In this paper we discuss three evolved disc sources with evidence of atypical emission lines in their infrared spectra. Th...
Matsuura, M Yamamura, I Jan Cami Onaka, T Murakami, H
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ScienceOpen Astronomy & Astrophysics
The time variation in the water-vapour bands in oxygen-rich Mira variables has been investigated using multi-epoch ISO/SWS spectra of four Mira variables in the 2.5-4.0$\ mu $ m region. All four stars show H 2 O bands in absorption around minimum in the visual light curve. At maximum, H 2 O emission features appear in the~ 3.5-4.0$\ mu $ m region, ...
Kaasalainen, M Viikinkoski, M
Published in
ScienceOpen Astronomy & Astrophysics
We discuss inversion methods for shape reconstruction with complementary data sources. The current main sources are photometry, adaptive optics or other images, occultation timings, and interferometry, and the procedure can readily be extended to include range-Doppler radar and thermal infrared data as well. We introduce the octantoid, a generally ...
Verhoelst, Tijl Decin, Leen Van Malderen, R Hony, Sacha Jan Cami Eriksson, Kjell Perrin, G Deroo, Pieter Vandenbussche, Bart Waters, Lbfm
...
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ScienceOpen Astronomy & Astrophysics
In this paper we study the extended atmosphere of the late-type supergiant $\ alpha $ Orionis. Infrared spectroscopy of red supergiants reveals strong molecular bands, some of which do not originate in the photosphere but in a cooler layer of molecular material above it. Lately, these layers have been spatially resolved by near and mid-IR interfero...
