Search for magnetic fields in HgMn stars by using relative strengths of multiplet 74 Fe II lines

Details Search for magnetic fields in HgMn stars by using relative strengths of multiplet 74 Fe II lines Search for magnetic fields in HgMn stars by using relative strengths of multiplet 74 Fe II lines

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346..139h&link_type=abstract

Astronomy and Astrophysics, v.346, p.139-145 (1999)

Astronomy and Astrophysics

Astrophysics

22

Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Magnetic Fields

Scientific paper

The anomalous strength of the Fe II lambda 6147.7 line relative to Fe II lambda 6149.2 in the stars with magnetic fields is used for detecting magnetic fields in very slowly rotating HgMn stars. The diagnosis based on this pair of magnetically sensitive Fe lines is a simple and fast tool, but its application to more rapidly rotating HgMn stars is hampered by blending with Hg II lambda 6149.5. For spectra of sharp-lined HgMn stars (with v sin i<4 km s(-1) ) taken at high resolving power (R>= 100 000) both lines, Fe II lambda 6149.25 and Hg II lambda 6149.48, become fully unblended. The observed relative differences between the equivalent widths of the two Fe II lines are compared with those derived from synthetic spectra computed by neglecting magnetic field effects. This comparison has shown that three HgMn stars, HD 175640, HD 178065 and HD 186122 are very likely to possess a magnetic field that could be larger than 2 kG. Based on observations obtained at the European Southern Observatory, La Silla, Chile (ESO programme No.~61.D-0480)

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