R. Costero

Medium-resolution spectroscopic study of the intermediate-mass pre-main sequence binary θ1 Ori E

R. Costero, Juan Echevarría, A. Ruelas-Mayorga, Leonardo J. Sanchez

ABSTRACT $\theta ^1$ Ori E is a very young and relatively massive pre-main sequence (PMS) spectroscopic and eclipsing binary with nearly identical components. We analyse Échelle spectra of the system obtained over fifteen years and report 91 radial velocities measured from cross-correlating …

mx (code pays fourni par la source)

Échelle spectroscopy of the chemically peculiar star θ1 Ori F

R. Costero, Christine Allen, A. Ruelas-Mayorga, Leonardo J. Sanchez et autres

ABSTRACT We analyse Échelle spectra of θ1 Ori F obtained by us on six nights unevenly distributed along 6 yr; we identify several hundred spectral lines and measure, for the first time, the star’s heliocentric radial velocity. We also collect and discuss …

mx (code pays fourni par la source)

New radial velocity observations of AH Her: evidence for material outside the tidal radius

Juan Echevarría, J V Hernández Santisteban, O Segura Montero, S H Ramírez et autres

ABSTRACT Spectroscopic observations of AH Herculis during a deep quiescent state are put forward. We found the object in a rare long minima, allowing us to derive accurately the semi-amplitudes: $K_1 =121 \pm \, 4$ km s−1 and K2 = 152 ± …

nl, mx, gb, fr (code pays fourni par la source)

The Importance of Historical Measures for Dynamical Models of the\n Evolution of Trapezium-type Multiple Systems

Christine Allen, L. J. Sánchez, A. Ruelas-Mayorga, R. Costero

As an illustration of the value of historical measures we present some\nexamples of the dynamical evolution of multiple systems resembling the Orion\nTrapezium. We constructed models by combining carefully selected historical\nmeasures of the separations among components of young massive stellar systems\nwith modern observations. …

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Multiplicity of the Orion Trapezium stars

R. Costero

Preliminary results on the ongoing spectroscopic study of the six brightest Orion Trapezium stars is presented here. The main purpose of this work is to better understand the multiplicity and stability of each of these subsystems and the dynamical future of the …

From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula

J V Hernández Santisteban, Juan Echevarría, Sergey V. Zharikov, V. Neustroev et autres

We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high-proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and its subsequent quiescent state. An extended emission around the source was observed up …

nl, mx, fi, gb, us, es, ru, de (code pays fourni par la source)

THE IMPORTANCE OF HISTORICAL MEASURES FOR DYNAMICAL MODELS OF THE EVOLUTION OF TRAPEZIUM-TYPE MULTIPLE SYSTEMS

Christine Allen, Leonardo J. Sanchez, A. Ruelas-Mayorga, R. Costero

As an illustration of the value of historical measures we present some examples of the dynamical evolution of multiple systems resembling the Orion Trapezium. We constructed models by combining carefully selected historical measures of the separations among components of young massive stellar …

mx (code pays fourni par la source)

From outburst to quiescence: spectroscopic evolution of the high-proper motion cataclysmic variable V1838 Aql

J V Hernández Santisteban, J. Echevarría, Sergey V. Zharikov, V. Neustroev et autres

We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and when the source came back to quiescence. The object was detected as …

Extensive Photometry of V1838 Aql during the 2013 Superoutburst

Enrique de Miguel, J V Hernández Santisteban, R. Michel, R. Costero et autres

We present an in-depth photometric study of the 2013 superoutburst of the recently discovered cataclysmic variable V1838 Aql and subsequent photometry near its quiescent state. A careful examination of the development of the superhumps is presented. Our best determination of the orbital …

The dynamical evolution of multiple systems of trapezium type

Christine Allen, A. Ruelas-Mayorga, Leonardo J. Sanchez, R. Costero

We have selected archival observational data for several O and B trapezia in the Milky Way. For each of the main components of the trapezia, we obtained transverse velocities from the historical separation data. With this information, and with the stellar masses …

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The formation of massive binaries as a result of the dynamical decay of trapezium systems

Christine Allen, Alejandro Ruelas-Mayorga, Leonardo J. Sanchez, R. Costero

Abstract We propose that a significant fraction of the wide massive binaries in the field are formed as a result of the disintegration of multiple systems of trapezium type. As examples we discuss here the binaries formed from the evolution of the …

mx (code pays fourni par la source)

The white dwarf binary pathways survey – II. Radial velocities of 1453 FGK stars with white dwarf companions from LAMOST DR 4

Alberto Rebassa-Mansergas, Juanjuan Ren, Puji Irawati, E. García-Berro et autres

We present the second paper of a series of publications aiming at obtaining a better understanding regarding the nature of type Ia supernovae (SN Ia) progenitors by studying a large sample of detached F, G and K main-sequence stars in close orbits …

es, cn, th, gb, cl, mx (code pays fourni par la source)