early-type -stars
WR 20a: A massive cornerstone binary system comprising two extreme early-type stars
... (see e.g. Fig. 1) indicating that the components of WR 20a must have identical spectral types and a visible brightness ratio of ∼ 1. The spectrum of WR 20a displays many absorption lines of H , He and N unlike what ...
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XMM-Newton X-ray study of early type stars in the Carina OB1 association
... words. stars: early-type – stars: binaries – X-rays: stars ...by early-type stars is nowadays well established, its origin is still not fully ...luminous ...
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Early-type stars in the core of the young open cluster Westerlund 2
... the early-type stars might still be hidden from our view by the material of their natal ...the stars in RCW 49 that are typical of a star formation ...massive stars in Westerlund 2 have ...
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X-Ray Spectroscopy with XMM: A New Powerful Tool to Determine Fundamental Parameters of Early-type Stars
... from early-type stars Early-type stars of spectral-type O and Wolf-Rayet play a crucial role in the evolution of most of the galaxies and their study has impact beyond ...
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Differential rotation in early type stars
... rotating stars, the interferometric measure- ments of α Eri and its fundamental parameters corrected for gravitational dark- ening effects we infer that the star might have a core rotating ...
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A spectroscopic investigation of early-type stars in the young open cluster Westerlund 2
... O-type stars, spread all over the OM field of view, was compared to the coor- dinates taken from the catalogue of Massey & Thompson (1991, hereafter ...
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Early-type stars observed in the ESO UVES Paranal Observatory Project - IV. Studies of CN, CH+ and CH in the interstellar medium
... 2 T H E S A M P L E A N D B A S I C DATA A N A LY S I S Our main stellar sample is described in Paper I, and the anal- ysis of the spectra mirrors that described in the earlier paper, so only brief details are given. The ...
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Early-type stars in the young open cluster IC 1805. II. The probably single stars HD 15570 and HD 15629, and the massive binary/triple system HD 15558
... two stars. Provided the spectral type derived from our spectra for the primary is typical of the two stars constituting the close binary, we are possibly observing the composite spectrum of two ...
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Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association. I. The multiplicity of O-type stars
... O-type stars. The next columns yield the number of O-stars in each cluster, the number of detected short and long-period binaries and the variable stars (potential binaries and probable ...
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The early-type close binary CV Velorum revisited
... B stars in the solar ...B stars which can be used for statistical predictions of masses or ...words. stars: early-type – stars: oscillations – stars: binaries: eclipsing – ...
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Two spotted and magnetic early B-type stars in the young open cluster NGC2264 discovered by MOST and ESPaDOnS
... words. Stars: fundamental parameters - Stars: early-type - Stars: individual: HD 47887, HD 47777 - Stars: magnetic field - open clusters and associations: individual: NGC 2264 ...
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Early-type objects in NGC6611 and the Eagle Nebula.
... Be stars is whether Be stars are born as Be stars or whether they become Be stars during their ...of stars in NGC 6611 and the star-formation region of Eagle Nebula have been carried ...
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Gravity darkening in late-type stars
... eff , and β adjusted. Observational works that have given constraints on the gravity darkening exponent β come essentially from the photometry of eclipsing binaries (Djuraˇsevi´c et al. 2006) and interferometric ...
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Abundance study of two magnetic B-type stars in the Orion Nebula Cluster
... massive stars remain largely un- ...OB stars is needed to assess the efficiency of rotational mixing and to constrain evolutionary and interior models ...B-type stars in the very young Orion ...
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Variable stars in Local Group Galaxies: I. Tracing the early chemical enrichment and radial gradients in the Sculptor dSph with RR Lyrae stars
... (RGB) stars ([Fe/H] > ...(RHB) stars are more centrally concentrated than blue HB (BHB) stars suggests that a spread in metallicity is also present in the old stellar component (HB stars), ...
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On the nature of early-type emission line objects in NGC6611
... 2 SF2A 2007 Fig. 1. Location of the stars observed with the VLT-GIRAFFE in the field of NGC6611. The image is a RGB mosaic with 3 channels of SPITZER (B: 3.6µm, G: 4.5µm, and R: 8µm). The small white circles are ...
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Constraints on early-type galaxy structure from spectroscopically selected gravitational lenses
... The lens candidates are selected from within the spectroscopic database of the Sloan Digital Sky Survey (SDSS) based on the appearance of two significantly different reds[r] ...
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Asteroseismology of solar-type stars with Kepler: III. Ground-based data
... that stars from the temperture range 6500 – 7500 K in photometry are found systematically cooler by about 300 K in ...the stars, and as such should be ...
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Early-type galaxies in the NOAO Fundamental Plane Survey
... The cluster sample consists of ∼100 clusters, se- lected by X-ray luminosity, to a depth of z = 0.06 and distributed over the whole sky. Clusters have been imaged in the B and R bands and color- magnitude relations are ...
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DETECTION OF NEUTRAL PHOSPHORUS IN THE NEAR-ULTRAVIOLET SPECTRA OF LATE-TYPE STARS
... Z elements ([Mg/Fe], [Si/Fe], and [Ca/Fe]). Several sets of abundances derived by other studies are shown for comparison. The even-Z α-elements exhibit the familiar pattern marked by a plateau at low metallicity and a ...
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