Search Publications
Modelling the light variability of the Ap star ɛ Ursae Majoris
Shulyak, D.; Kochukhov, O.; Krtička, J. +2 more
Aims: We simulate the light variability of the Ap star ɛ UMa using the observed surface distributions of Fe, Cr, Ca, Mn, Mg, Sr, and Ti obtained with the help of the Doppler imaging technique.
Methods: Using all photometric data available, we specified light variations of ɛ UMa modulated by its rotation from far UV to IR. We employed the…
The effects of star formation on the low-metallicity ISM: NGC 4214 mapped with Herschel/PACS spectroscopy
Poglitsch, A.; Sturm, E.; Okumura, K. +12 more
We present Herschel/PACS spectroscopic maps of the dwarf galaxy NC4214 observed in 6 far infrared fine-structure lines: [C ii] 158 µm, [O iii] 88 µm, [O i] 63 µm, [O i] 146 µm, [N ii] 122 µm, and [N ii] 205 µm. The maps are sampled to the full telescope spatial resolution and reveal unprecedented detail on ~ 150…
The environmental dependence of galaxy properties at z = 2
Tanaka, M.; Venemans, B.; De Breuck, C. +1 more
We report on the environmental dependence of galaxy properties at z=2.15. We construct multi-band photometric data sets in the (proto-)cluster PKS1138-26 field and in the GOODS field. We then fit spectral energy distributions of the galaxies with model templates generated with the latest stellar population synthesis code and derive physical proper…
Dust, Ice, and Gas In Time (DIGIT) Herschel program first results. A full PACS-SED scan of the gas line emission in protostar DK Chamaeleontis
Waters, L. B. F. M.; Maret, S.; Güdel, M. +42 more
Aims: We aim to study the composition and energetics of the circumstellar material of DK Cha, an intermediate-mass star in transition from an embedded configuration to a star plus disk stage, during this pivotal stage of its evolution.
Methods: Using the range scan mode of PACS on the Herschel Space Observatory, we obtained a spectrum of…
Herschel ATLAS: The cosmic star formation history of quasar host galaxies
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +50 more
We present a derivation of the star formation rate per comoving volume of quasar host galaxies, derived from stacking analyses of far-infrared to mm-wave photometry of quasars with redshifts 0 < z < 6 and absolute I-band magnitudes -22 > IAB > -32 We use the science demonstration observations of the first ~16 deg2…
The end of the white dwarf cooling sequence in M 67
Salaris, M.; Kochanek, C. S.; Yadav, R. K. S. +21 more
In this paper, we present for the first time a proper-motion-selected white dwarf (WD) sample of the old Galactic open cluster M 67, down to the bottom of the WD cooling sequence (CS). The color-magnitude diagram is based on data collected with the LBC-Blue camera at the prime-focus of LBT. As first epoch data, we used CFHT-archive images collecte…
Dust/gas correlations from Herschel observations
Bernard, J. -P.; Reach, W. T.; Okumura, K. +21 more
Context. Previous Spitzer and IRAS observations of the LMC suggest an excess of FIR emission with respect to the gas surface density traced by 12CO rotational emission lines and H i 21 cm emission. This so-called “FIR excess” is especially noticeable near molecular clouds in the LMC, and has usually been interpreted as indicating the pr…
Evidence for magnetic flux cancelation leading to an ejective solar eruption observed by Hinode, TRACE, STEREO, and SoHO/MDI
Young, P. R.; Mason, H. E.; Moore, R. L. +2 more
Aims: We study the onset of a solar eruption involving a filament ejection on 2007 May 20.
Methods: We observe the filament in Hα images from Hinode/SOT and in EUV with TRACE and STEREO/SECCHI/EUVI. Hinode/XRT images are used to study the eruption in soft X-rays. From spectroscopic data taken with Hinode/EIS we obtain bulk-flow velocitie…
V4332 Sagittarii: a circumstellar disc obscuring the main object
Schmidt, M.; Tylenda, R.; Kamiński, T.
Context. V4332 Sgr experienced an outburst in 1994 whose observational characteristics in many respects resemble those of the eruption of V838 Mon in 2002. It has been proposed that these objects erupted because of a stellar-merger event.
Aims: Our aim is to derive, from observational data, information on the present (10-15 yrs after the outb…
Ortho-to-para ratio of interstellar heavy water
Falgarone, E.; Maret, S.; Henning, T. +65 more
Context. Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular D/H ratios have been found in the environments of low-mass star-forming regions, and in particular the Class 0 protostar IRAS 16293-2422.
Aims: The CHESS (Chemical HErschel Surveys of Star forming regions) key program aims to study the molecular complexit…