Explanipedia

TheGaia-ESO survey: A spectroscopic study of the young open cluster NGC 3293 Open

T. Morel, Aurore Blazère, T. Semaan, E. Gosset, J. Zorec , et al. · 2022

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…

The Gaia-ESO Survey: The analysis of the hot-star spectra Open

R. Blomme, S. Daflon, M. Gebran, A. Herrero, A. Lobel , et al. · 2022

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…

HD 96446: a long-period binary with a strongly magnetic He-rich primary with β Cephei pulsations Open

J. F. González, M. Briquet, N. Przybilla, M. F. Nieva, P. De Cat , et al. · 2019

Aims . HD 96446 is a magnetic B2p He-strong star that has been reported to be a β Cep pulsator. We present a detailed spectroscopic analysis of this object based on an intensive observational data set obtained in a multisite campaign with …

CRIRES-POP: a library of high resolution spectra in the near-infrared II. Data reduction and the spectrum of the K giant 10 Leonis Open

C. P. Nicholls, T. Lebzelter, A. Smette, B. Wolff, H. Hartman , et al. · 2018

Context. High resolution stellar spectral atlases are valuable resources to astronomy. They are rare in the 1-5 mu m region for historical reasons, but once available, high resolution atlases in this part of the spectrum will aid the study…

Detection of magnetic fields in He-rich early B-type stars using HARPSpol Open

S. P. Järvinen, S. Hubrig, I. Ilyin, M. Schöller, M. F. Nieva , et al. · 2018

\nAims. We focus on early-B type stars with helium overabundance, for which the presence of a magnetic field has not previously been reported.\nMethods. The measurements were carried out using high-spectral-resolution spectropolarimetric o…

The B fields in OB stars (BOB) survey Open

T. Morel, N. Castro, L. Fossati, S. Hubrig, N. Langer , et al. · 2018

The B fields in OB stars (BOB) survey is an ESO large programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence rate, properties, and ultimately the origin of magnetic fie…

On the 3He anomaly in hot subdwarf B stars Open

D. P. Schneider, A. Irrgang, U. Heber, M. F. Nieva, N. Przybilla · 2017

Decades ago, 3 He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes i…

Magnetic field geometry and chemical abundance distribution of the He-strong star CPD −57°3509 Open

S. Hubrig, N. Przybilla, H. Korhonen, I. Ilyin, M. Schöller , et al. · 2017

The magnetic field of CPD -57 3509 was recently detected in the framework of\nthe BOB (B fields in OB stars) collaboration. We acquired low-resolution\nspectropolarimetric observations of CPD -57 3509 with FORS2 and high-resolution\nUVES o…

A comprehensive study of young B stars in NGC 2264 Open

K. Zwintz, E. Moravveji, P. I. Pápics, A. Tkachenko, N. Przybilla , et al. · 2017

\n Context. Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude level and permit a search for slowly pulsating B (…

A comprehensive study of young B stars in NGC 2264: I. Space photometry and asteroseismology Open

K. Zwintz, E. Moravveji, P. I. Pápics, A. Tkachenko, N. Przybilla , et al. · 2017

Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude level and permits a search for Slowly Pulsating B (SPB) type p…

B fields in OB stars (BOB): The magnetic triple stellar system HD 164492C in the Trifid nebula. Open

J. F. González, S. Hubrig, N. Przybilla, T. A. Carroll, M. F. Nieva , et al. · 2017

HD 164492C is a spectroscopic triple stellar system that has been recently detected to possess a strong magnetic field. We have obtained high-resolution spectroscopic and spectropolarimetric observations over a time span of two years and d…

B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD −62° 2124 Open

N. Castro, L. Fossati, S. Hubrig, S. P. Järvinen, N. Przybilla , et al. · 2016

The origin and evolution of magnetism in OB stars is far from being well\nunderstood. With approximately 70 magnetic OB stars known, any new object with\nunusual characteristics may turn out to be a key piece of the puzzle. We report\nthe …

Bfields in OB stars (BOB): Concluding the FORS 2 observing campaign Open

M. Schöller, S. Hubrig, L. Fossati, T. A. Carroll, M. Briquet , et al. · 2016

Aims. The B fields in OB stars (BOB) Collaboration is based on an ESO Large Programme to study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive stars. Methods. In the framework of this program, we ca…

CRIRES-POP: a library of high resolution spectra in the near-infrared Open

C. P. Nicholls, T. Lebzelter, A. Smette, B. Wolff, H. Hartman , et al. · 2016

Context. High resolution stellar spectral atlases are valuable resources to\nastronomy. They are rare in the $1 - 5\\,\\mu$m region for historical reasons,\nbut once available, high resolution atlases in this part of the spectrum will\naid…

B fields in OB stars (BOB): Detection of a magnetic field in the He-strong star CPD −57° 3509 Open

N. Przybilla, L. Fossati, S. Hubrig, M. F. Nieva, S. P. Järvinen , et al. · 2016

Aims. We report the detection of a magnetic field in the helium-strong star CPD −57° 3509 (B2 IV), a member of the Galactic open cluster NGC 3293, and characterise the star’s atmospheric and fundamental parameters. Methods. Spectropolarime…

Quantitative spectroscopy of hot stars: accurate atomic data applied on a large scale as driver of recent breakthroughs Open

N. Przybilla, V. Schaffenroth, M. F. Nieva, K. Butler · 2015

OB-type stars present hotbeds for non-LTE physics because of their strong radiation fields that drive the atmospheric plasma out of local thermodynamic equilibrium. We report on recent breakthroughs in the quantitative analysis of the opti…

The nuclear path of the CNO cycles in massive stars Open

N. Przybilla, M. F. Nieva, A. Maeder, G. Meynet · 2015

We discuss how the nuclear path of the CNO cycles in massive stars can be employed as a quality indicator for model atmosphere analyses and for the derivation of tight observational constraints for developing a better understanding of the …

B fields in OB stars (BOB): FORS 2 spectropolarimetric follow-up of the two rare rigidly rotating magnetosphere stars HD 23478 and HD 345439 Open

S. Hubrig, M. Schöller, L. Fossati, T. Morel, N. Castro , et al. · 2015

\n Aims. Massive B-type stars with strong magnetic fields and fast rotation\n are very rare and pose a mystery for theories of star formation and magnetic field\n evolution. Only two such stars, called σ Ori E analogues, were known until r…

B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars beta CMa and epsilon CMa Possible lack of a "magnetic desert" in massive stars Open

L. Fossati, N. Castro, T. Morel, N. Langer, M. Briquet , et al. · 2015

Only a small fraction of massive stars seem to host a measurable structured magnetic field, whose origin is still unknown and whose implications for stellar evolution still need to be assessed. Within the context of the "B fields in OB sta…

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