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Spectral Classification of Algol C
Megan G. Frank, David G. Whelan, Jessica C. Junginger
The spectral classification of Algol C, the third star in the Algol triple system, has long been a matter of some uncertainty. There is good reason to suspect that it should be a m…
HD 63021: Chromospheric Activity and Mass Transfer in a Close Binary
D. G. Whelan, S. D. Chojnowski, J. Labadie-Bartz +13
Prompted by X-ray detections from multiple surveys, we investigated the A-type star HD 63021 and found that it is a double-lined spectroscopic binary with highly variable emission…
Discovery of Resolved Magnetically Split Lines in SDSS/APOGEE Spectra of 157 Ap/Bp Stars
S. Drew Chojnowski, Swetlana Hubrig, Sten Hasselquist +7
We report on magnetic field measurements of 157 chemically peculiar A/B stars (Ap/Bp) based on resolved, magnetically split absorption lines present in -band spectra provided by…
The Remarkable Be+sdOB Binary HD 55606 I: Orbital and Stellar Parameters
S. Drew Chojnowski, Jonathan Labadie-Bartz, Thomas Rivinius +20
Prompted by peculiar spectroscopic variability observed in SDSS/APOGEE -band spectra, we monitored the Be star HD 55606 using optical spectroscopy and found that it is an exotic…
HD 63021: An Ae Star with X-ray Flux
David G. Whelan, Jon Labadie-Bartz, S. Drew Chojnowski +2
Balmer and Fe II (42) multiplet emission were discovered in a spectrum of HD 63021 on 10 April (UTC), 2018. Subsequent observations revealed variability in both photospheric absorp…
Outbursts and Disk Variability in Be Stars
Jonathan Labadie-Bartz, S. Drew Chojnowski, David G. Whelan +16
In order to study the growth and evolution of circumstellar disks around classical Be stars, we analyze optical time-series photometry from the KELT survey with simultaneous infrar…