SIMBAD references

2024ApJ...966L..23H - Astrophys. J., 966, L23 (2024/May-2)

Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star.

HUENEMOERDER D.P., PRADHAN P., CANIZARES C.R., GUNDERSON S., IGNACE R., NICHOLS J.S., POLLOCK A.M.T., SCHULZ N.S., SWARM D.K. and TORREJON J.M.

Abstract (from CDS):

High-resolution X-ray spectra of π Aqr, a γ Cas-type star, obtained with the Chandra/HETG spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe; a strong, hard continuum; and a lack of He-like ions, indicating the presence of very hot thermal plasma. The X-ray light curve showed significant fluctuations, with coherent variability at a period of about 3400 s in one observation. The hardness ratio was relatively constant except for one observation in which the spectrum was much harder and more absorbed. We interpret the X-ray emission as arising from accretion onto the secondary, which is likely a magnetic white dwarf, an intermediate polar system.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): X-ray astronomy - Gamma Cassiopeiae stars - High resolution spectroscopy - Early-type emission stars - White dwarf stars - Be stars

Simbad objects: 3

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