Two new chemically peculiar stars with resolved magnetically split lines

Abstract

We report the discovery of resolved magnetically split lines in two chemically peculiar stars, the SrEuCr star HD 92499 and the Bp SiCr star HD 157751. From FEROS spectra, we have measured a mean magnetic field modulus of 8.5 kG for HD 92499 and a mean magnetic field modulus of 6.6 kG for HD 157751. Both stars have small projected rotational velocities: v sin i = 3.0 km/s and 8.5 km/s, respectively. Our preliminary abundance analysis reveals ionisation imbalance of rare earths in HD 92499 indicating the abundance pattern typical of rapidly oscillating Ap stars. Cr and Fe are found strongly overabundant in HD 157751.

4 pages, 6 figures, 1 table, accepted for publication as a letter to MNRAS

References in corpus (3)

• Measurements of magnetic fields over the pulsation cycle in six roAp stars with FORS1 at the VLT
• New measurements of magnetic fields of roAp stars with FORS1 at the VLT
• Evolution of magnetic fields in stars across the upper main sequence: I. Catalogue of magnetic field measurements with FORS1 at the VLT

Cited by in corpus (8)

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• TESS Cycle 1 observations of roAp stars with 2-min cadence data
• The 10.5 year rotation period of the strongly magnetic rapidly oscillating Ap star HD 166473
• The challenge of measuring magnetic fields in strongly pulsating stars: the case of HD 96446
• Magnetic field geometry and magnetospheric environment of the strongly magnetic Of?p star NGC 1624-2
• HD 149277: a rare short-period SB2 system with a subsynchronously rotating magnetic He-rich primary