Chemical Composition of a Young Star HD 377

AbstractOpen clusters are important objects to study the galactic structure and its dynamical behavior as well as the stellar formation and evolution. We carried out a spectroscopic analysis to derive atmospheric parameters and chemical composition for 52 giant stars within 9 galactic open clusters. We have used the high-resolution spectra from FEROS, HARPS and UVES in the ESO archive. The methodology used is based on LTE-hypothesis. Abundances of C, N, O, Na, Mg, Al, Si, Ca, Ti, Cr, Ni, YII, LaII, CeII, and NdII were calculated. Although most of these clusters present spectroscopic analysis in the literature, some CNO and s-process abundances were not previously estimated or were calculated with high uncertainties. Several lines of such elements were identified and used to calculate new abundances and improve some previous one.

Download Full-text

The chemical composition of a main-sequence star in the Small Magellanic Cloud

The Astrophysical Journal ◽

10.1086/185847 ◽

1990 ◽

Vol 362 ◽

pp. L59 ◽

Cited By ~ 16

Author(s):

P. L. Dufton ◽

A. Fitzsimmons ◽

I. D. Howarth

Keyword(s):

Chemical Composition ◽

Main Sequence ◽

Magellanic Cloud ◽

Main Sequence Star ◽

Small Magellanic Cloud

Download Full-text

High-Resolution Spectroscopy of Cool Carbon-Rich and Metal-Poor Star HD 209621

Open Astronomy ◽

10.1515/astro-2017-0399 ◽

2012 ◽

Vol 21 (4) ◽

Cited By ~ 1

Author(s):

E. Matrozis ◽

L. Začs ◽

A. Barzdis

Keyword(s):

High Resolution ◽

Spectral Synthesis ◽

High Resolution Spectroscopy ◽

High Resolution Spectrum ◽

Atmospheric Parameters ◽

Atmospheric Models ◽

Abundance Pattern ◽

Element Abundances ◽

First Time ◽

Metal Poor Star

AbstractElement abundances for HD 209621 obtained earlier display significant discrepancies, especially in the case of CNO and neutron-capture elements. Therefore we performed a detailed analysis of chemical composition of this star using a new high-resolution spectrum. Atmospheric parameters and abundance pattern are updated, and the mechanism of nucleosynthesis is examined. Abundances for 11 elements are calculated for the first time. The method of atmospheric models and spectral synthesis was used. The following values of atmospheric parameters are derived: T

Download Full-text

A large rotating structure around AB Doradus A at VLBI scale

Proceedings of the International Astronomical Union ◽

10.1017/s1743921319009785 ◽

2019 ◽

Vol 15 (S354) ◽

pp. 189-194

Author(s):

J. B. Climent ◽

J. C. Guirado ◽

R. Azulay ◽

J. M. Marcaide

Keyword(s):

Magnetic Reconnection ◽

Main Sequence ◽

Complex Structure ◽

Main Sequence Star ◽

Polar Cap ◽

Vlbi Observations ◽

Rotating Structure ◽

Source Structure ◽

Expected Position

AbstractWe report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.

Download Full-text

The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer

Experimental Astronomy ◽

10.1007/s10686-021-09710-2 ◽

2021 ◽

Author(s):

F. Nicastro ◽

J. Kaastra ◽

C. Argiroffi ◽

E. Behar ◽

S. Bianchi ◽

...

Keyword(s):

Chemical Composition ◽

High Resolution ◽

Deep Understanding ◽

High Resolution Spectroscopy ◽

X Ray ◽

Viable Solution ◽

Surrounding Space ◽

Nuclear Processes ◽

The Universe ◽

Very High

AbstractMetals form an essential part of the Universe at all scales. Without metals we would not exist, and the Universe would look completely different. Metals are primarily produced via nuclear processes in stars, and spread out through winds or explosions, which pollute the surrounding space. The wanderings of metals in-and-out of astronomical objects are crucial in determining their own evolution and thus that of the Universe as a whole. Detecting metals and assessing their relative and absolute abundances and energetics can thus be used to trace the evolution of these cosmic components. The scope of this paper is to highlight the most important open astrophysical problems that will be central in the next decades and for which a deep understanding of the Universe’s wandering metals, their physical and kinematical states, and their chemical composition represents the only viable solution. The majority of these studies can only be efficiently performed through High Resolution Spectroscopy in the soft X-ray band.

Download Full-text

On the origin of the helium-rich population in the peculiar globular cluster Omega Centauri

Proceedings of the International Astronomical Union ◽

10.1017/s1743921310004114 ◽

2009 ◽

Vol 5 (S268) ◽

pp. 187-188

Author(s):

Donatella Romano ◽

M. Tosi ◽

M. Cignoni ◽

F. Matteucci ◽

E. Pancino ◽

...

Keyword(s):

Chemical Composition ◽

Globular Cluster ◽

Main Sequence ◽

Milky Way ◽

Dwarf Galaxy ◽

Potential Well ◽

Galactic Winds ◽

Supernova Explosions

AbstractIn this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue main sequence (bMS) of the Galactic globular cluster Omega Centauri. In a scenario where the cluster is the surviving remnant of a dwarf galaxy ingested by the Milky Way many Gyr ago, the peculiar chemical composition of the bMS stars can be naturally explained by considering the effects of strong differential galactic winds, which develop owing to multiple supernova explosions in a shallow potential well.

Download Full-text

Study of the high resolution spectrum of 32 S 16 O 18 O: The ν 1 and ν 3 bands

Journal of Quantitative Spectroscopy and Radiative Transfer ◽

10.1016/j.jqsrt.2015.08.010 ◽

2016 ◽

Vol 168 ◽

pp. 29-39 ◽

Cited By ~ 16

Author(s):

O.N. Ulenikov ◽

E.S. Bekhtereva ◽

Yu.V. Krivchikova ◽

V.A. Zamotaeva ◽

T. Buttersack ◽

...

Keyword(s):

High Resolution ◽

High Resolution Spectrum ◽

O 18

Download Full-text

High resolution spectrum of GdO

Canadian Journal of Physics ◽

10.1139/p76-291 ◽

1976 ◽

Vol 54 (24) ◽

pp. 2429-2434 ◽

Cited By ~ 6

Author(s):

B. R. Yadav ◽

S. B. Rai ◽

D. K. Rai

Keyword(s):

High Resolution ◽

Emission Spectrum ◽

Visible Emission ◽

High Resolution Spectrum ◽

First Order ◽

Isotopic Shifts ◽

Vibrational Constants ◽

Dc Arc

The visible emission spectrum of the GdO molecule has been produced in a DC arc source and has been photographed in the first order of a 10.6 m grating spectrograph. Bands are shown to have a six-headed structure and improved vibrational constants have been obtained in this study. Isotopic shifts have been calculated for the various isotopic molecules. Tentative suggestions regarding the nature of the transition have been made.

Download Full-text