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View article: The EDIBLES survey
The EDIBLES survey Open
Context. Numerous studies of diffuse interstellar band (DIB) profiles have detected substructures, which in turn suggests that large molecules are acting as their carriers. However, some of the narrowest DIBs generally do not show such sub…
View article: The EDIBLES survey. X. The 6196 Å diffuse interstellar band: Identification of side DIBs as an indication of a small carrier molecule
The EDIBLES survey. X. The 6196 Å diffuse interstellar band: Identification of side DIBs as an indication of a small carrier molecule Open
Context: Numerous studies of diffuse interstellar band (DIB) profiles have detected substructures, which in turn suggests that large molecules are acting as their carriers. However, some of the narrowest DIBs generally do not show such sub…
View article: HD 193182: A Bright Twin of the Unusual Be-shell Star HD 94509
HD 193182: A Bright Twin of the Unusual Be-shell Star HD 94509 Open
The star HD 94509 was recognized as an extreme example in the class of Be and shell stars because of its unusual late-type shell spectrum and anomalous line profiles. Using high-resolution and high-signal-to-noise ratio spectroscopy obtain…
View article: X-ray absorption spectroscopy of FeH<sup>+</sup> to aid its identification in astrochemical environments
X-ray absorption spectroscopy of FeH<sup>+</sup> to aid its identification in astrochemical environments Open
High-resolution X-ray absorption spectroscopy is performed on the diatomic molecular ion FeH + and compared with the absorption of the interstellar medium in the iron L 2,3 edge observed in the Cygnus X-1 spectrum.
View article: Quantitative spectroscopy of multiple OB stars
Quantitative spectroscopy of multiple OB stars Open
Context . The majority of massive stars are located in binary or multiple star systems. Compared to single stars, these objects pose additional challenges to quantitative analyses based on model atmospheres. In particular, little informati…
View article: Quantitative spectroscopy of multiple OB stars: I. The quadruple system HD 37061 at the centre of Messier 43
Quantitative spectroscopy of multiple OB stars: I. The quadruple system HD 37061 at the centre of Messier 43 Open
The majority of massive stars are located in binary or multiple star systems. Compared to single stars, these objects pose additional challenges to quantitative analyses based on model atmospheres. In particular, little information is curr…
View article: Runaway BN supergiant star HD 93840: Progenitor of an imminent core-collapse supernova above the Galactic plane
Runaway BN supergiant star HD 93840: Progenitor of an imminent core-collapse supernova above the Galactic plane Open
We present a quantitative spectral analysis of the extreme nitrogen-enhanced supergiant HD 93840 (BN1 Ib) at an intermediate galactic latitude. Based on an optical high-resolution spectrum and complementary ultraviolet and infrared (spectr…
View article: The EDIBLES Survey
The EDIBLES Survey Open
Context. There have been many attempts to identify families of diffuse interstellar bands (DIBs) with perfectly correlating band strengths. Although major efforts have been made to classify broadly based DIB families and important insights…
View article: The EDIBLES Survey. VIII. Band profile alignment of diffuse interstellar bands
The EDIBLES Survey. VIII. Band profile alignment of diffuse interstellar bands Open
Context: There have been many attempts to identify families of diffuse interstellar bands (DIBs) with perfectly correlating band strengths. Although major efforts have been made to classify broadly based DIB families and important insights…
View article: Iron Complexes as Potential Carriers of Diffuse Interstellar Bands: The Photodissociation Spectrum of Fe<sup>+</sup>(H<sub>2</sub>O) at Optical Wavelengths
Iron Complexes as Potential Carriers of Diffuse Interstellar Bands: The Photodissociation Spectrum of Fe<sup>+</sup>(H<sub>2</sub>O) at Optical Wavelengths Open
The fullerene ion C60+ is the only carrier of diffuse interstellar bands (DIBs) identified so far. Transition-metal compounds feature electronic transitions in the visible and near-infrared regions, making them potent…
View article: The blue supergiant Sher 25 revisited in the <i>Gaia</i> era
The blue supergiant Sher 25 revisited in the <i>Gaia</i> era Open
Aims. The evolutionary status of the blue supergiant Sher 25 and its membership to the massive cluster NGC 3603 are investigated. Methods. A hybrid non-local thermodynamic equilibrium (non-LTE) spectrum synthesis approach is employed to an…
View article: The blue supergiant Sher 25 revisited in the Gaia era
The blue supergiant Sher 25 revisited in the Gaia era Open
Aims. The evolutionary status of the blue supergiant Sher 25 and its membership to the massive cluster NGC 3603 are investigated. Methods. A hybrid non-LTE (local thermodynamic equilibrium) spectrum synthesis approach is employed to analys…
View article: Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method
Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method Open
Context. Late O-type stars at luminosities log L / L ⊙ ≲ 5.2 show weak winds with mass-loss rates lower than 10 −8 M ⊙ yr −1 . This implies that, unlike their more massive and more luminous siblings, their photospheric layers are not stron…
View article: Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method
Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method Open
Context. Late O-type stars at luminosities $\log L/L_\odot \lesssim 5.2$ show weak winds with mass-loss rates lower than 10$^{-8} M_\odot$ yr$^{-1}$. This implies that their photospheric layers are not strongly affected by the stellar wind…
View article: γ Columbae as a recently stripped pulsating core of a massive star
γ Columbae as a recently stripped pulsating core of a massive star Open
View article: MUSE 3D spectroscopy of BA-type supergiants in NGC 300
MUSE 3D spectroscopy of BA-type supergiants in NGC 300 Open
We present the results obtained using spectroscopic data taken with the intermediateresolution Multi Unit Spectroscopic Explorer (MUSE) of B and A-type supergiants and bright giants in the Sculptor Group galaxy NGC 300. For our analysis, a…
View article: Quantitative spectroscopy of B-type supergiants
Quantitative spectroscopy of B-type supergiants Open
Context. B-type supergiants are versatile tools to address a number of highly-relevant astrophysical topics, ranging from stellar atmospheres over stellar and galactic evolution to the characterisation of interstellar sightlines and to the…
View article: Quantitative spectroscopy of B-type supergiants
Quantitative spectroscopy of B-type supergiants Open
Context. B-type supergiants are versatile tools to address various astrophysical topics, ranging from stellar atmospheres over stellar and galactic evolution to the cosmic distance scale. Aims. A hybrid non-LTE approach - line-blanketed mo…
View article: The<i>Gaia</i>-ESO survey: A spectroscopic study of the young open cluster NGC 3293
The<i>Gaia</i>-ESO survey: A spectroscopic study of the young open cluster NGC 3293 Open
We present a spectroscopic analysis of the GIRAFFE and UVES data collected by the Gaia -ESO survey for the young open cluster NGC 3293. Archive spectra from the same instruments obtained in the framework of the ‘VLT-FLAMES survey of massiv…
View article: A small DOAS device for student training
A small DOAS device for student training Open
<p>Differential optical absorption spectroscopy (DOAS) has become a standard method for analysing the amount of various molecular species in the Earth's atmosphere. For student education we have developed a small device aiming to be …
View article: CRIRES high-resolution near-infrared spectroscopy of diffuse interstellar band profiles
CRIRES high-resolution near-infrared spectroscopy of diffuse interstellar band profiles Open
Aims. A high spectral resolution investigation of diffuse interstellar bands (DIBs) in the near-infrared ( YJ band) is conducted to test new methods, to confirm and improve existing parameters, and to search for new DIBs. Methods. The CRyo…
View article: Stellar labels for hot stars from low-resolution spectra
Stellar labels for hot stars from low-resolution spectra Open
We set out to determine stellar labels from low-resolution survey spectra of hot stars, specifically OBA stars with T eff ≳ 7500 K. This fills a gap in the scientific analysis of large spectroscopic stellar surveys such as LAMOST, which of…
View article: The <i>Gaia</i>-ESO Survey: The analysis of the hot-star spectra
The <i>Gaia</i>-ESO Survey: The analysis of the hot-star spectra Open
Context. The Gaia -ESO Survey (GES) is a large public spectroscopic survey that has collected, over a period of six years, spectra of ~10 5 stars. This survey provides not only the reduced spectra, but also the stellar parameters and abund…
View article: MUSE crowded field 3D spectroscopy in NGC 300
MUSE crowded field 3D spectroscopy in NGC 300 Open
Aims. A quantitative spectral analysis of BA-type supergiants and bright giants in an inner spiral arm region of the nearby spiral galaxy NGC 300 is presented, based on observations with the Multi Unit Spectroscopic Explorer (MUSE) on the …
View article: The ESO’s Extremely Large Telescope Working Groups
The ESO’s Extremely Large Telescope Working Groups Open
Since 2005 ESO has been working with its community and industry to develop an extremely large optical/infrared telescope. ESO’s Extremely Large Telescope, or ELT for short, is a revolutionary ground-based telescope that will have a 39-metr…
View article: New Spectropolarimetric Measurements of HD 144941
New Spectropolarimetric Measurements of HD 144941 Open
We report new spectropolarimetric measurements of the magnetic massive He-strong star HD 144941, which is the most extreme member of this class of stars in terms of surface helium abundance. Twelve epochs over a time span of 1.5 times the …
View article: YY Hya and its interstellar environment
YY Hya and its interstellar environment Open
Context. During a search for previously unknown Galactic emission nebulae, we discovered a faint 36′ diameter H α emission nebula centered around the periodic variable YY Hya. Although this star has been classified as an RR-Lyr variable, s…
View article: HD 144941: the most extreme helium-strong star
HD 144941: the most extreme helium-strong star Open
Since its discovery about 50 yr ago, HD 144941 has generally been classified as a peculiar member of the extreme helium (EHe) supergiant stars, a very rare class of low-mass hydrogen-deficient stars. We report the detection of a strong lon…
View article: A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the <i>Gaia</i> era
A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the <i>Gaia</i> era Open
Subdwarf B stars are core-helium-burning stars located on the extreme horizontal branch (EHB). Extensive mass loss on the red giant branch is necessary to form them. It has been proposed that substellar companions could lead to the require…
View article: Development of a versatile portable MAX-DOAS instrument
Development of a versatile portable MAX-DOAS instrument Open
<p>Multi-AXis Differential Optical Absorption Spectroscopy has become a versatile and mature measurement technique for determining various components of the Earth’s atmosphere, e.g. O<sub>3</sub>, SO<sub>2…