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25 April 2024 |
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Discovery of Resolved Magnetically Split Lines in SDSS/APOGEE Spectra of 157 Ap/Bp Stars | | S. Drew Chojnowski
; Swetlana Hubrig
; Sten Hasselquist
; Fiorella Castelli
; David G. Whelan
; Steven R. Majewski
; Christian Nitschelm
; D.A. García-Hernández
; Keivan G. Stassun
; Olga Zamora
; | | Date: |
4 Mar 2019 | | Abstract: | We report on magnetic field measurements of 157 chemically peculiar A/B stars
(Ap/Bp) based on resolved, magnetically split absorption lines present in
$H$-band spectra provided by the Sloan Digital Sky Survey (SDSS)/Apache Point
Observatory Galactic Evolution Experiment (APOGEE) survey. These stars
represent the extreme magnetic end of a still-growing sample of >900 Ap/Bp
stars selected among the APOGEE telluric standard stars as those with Ce III
absorption lines and/or literature Ap/Bp classifications. The lines most
frequently resolved into their split components for these stars in the $H$-band
pertain primarily pertain to Ce III, Cr II, Fe I, Mn II, Si I, and Ca II, in
addition to one or more unidentified ions. Using mean magnetic field modulus
(<B>) estimates for transitions with known Land’e factors, we estimate
effective Land’e factors for 5 Ce III lines and 15 unknown lines and proceed
to measure <B> of 157 stars, only 3 of which have previous literature estimates
of <B>. This 183% increase in the number of Ap/Bp stars for which <B> has been
measured is a result of the large number of stars observed by SDSS/APOGEE,
extension of high-resolution Ap/Bp star observations to fainter magnitudes, and
the advantages of long wavelengths for resolving magnetically split lines. With
<B>=25 kG, the star 2MASS J02563098+4534239 is currently the most magnetic star
of the SDSS/APOGEE sample. Effective Land’e factors, representative line
profiles, and magnetic field moduli are presented. The validity of the results
is supported using optical, high-resolution, follow-up spectra for 29 of the
stars. | | Source: | arXiv, 1903.1514 | | Services: | Forum | Review | PDF | Favorites | |
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