A study of the atmosphere of the metallic-line star 15 Vul

Details A study of the atmosphere of the metallic-line star 15 Vul A study of the atmosphere of the metallic-line star 15 Vul

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..362b&link_type=abstract

Astronomy Reports, Volume 42, Issue 3, May 1998, pp.362-369

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We performed new observations of the metallic-line star 15 Vul with the echelle spectrograph of the 1-m telescope of the Special Astrophysical Observatory. Based on measurements of the equivalent widths for more than 600 green and yellow-red lines of 24 elements, we redetermined the atmospheric chemical composition of this star. We discuss the results of our iron-abundance determination in the atmosphere of 15 Vul from Fe I and Fe II lines and analyze the effect of choosing lines and of the oscillator strengths used on the determination of lg e(Fe). Using Stenflo-Lindegren's multiline technique, we diagnose a magnetic field at the surface of 15 Vul with a complex structure. The field strength was found from 164 Fe I lines in the wavelength range 4300 to 6700 Angstroms to be fH = 2390 +/- 540 G. An analysis of Fe I lines with various excitation potentials e provides evidence that the magnetic regions on the surface of 15 Vul are cooler than the surrounding quiet photosphere.

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