X-ray emission from an FU Ori star in early outburst: HBC 722

Abstract

Aims: We conducted the first X-ray observations of the newly erupting FU Ori-type outburst in HBC 722 (V2493 Cyg) with the aim to characterize its X-ray behavior and near-stellar environment during early outburst. Methods: We used data from the XMM-Newton and Chandra X-ray observatories to measure X-ray source temperatures and luminosities as well as the gas column densities along the line of sight toward the source. Results: We report a Chandra X-ray detection of HBC 722 with an X-ray luminosity of LX ~ 4E30 erg s-1. The gas column density exceeds values expected from optical extinction and standard gas-to-dust ratios. We conclude that dust-free gas masses are present around the star, such as strong winds launched from the inner disk, or massive accretion columns. A tentative detection obtained by XMM-Newton two years earlier after an initial optical peak revealed a fainter X-ray source with only weak absorption.

arXiv commentAccepted for Astronomy & Astrophysics Letters on September 17, 2014

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Cited by in corpus (11)

• Chemical tracers of episodic accretion in low-mass protostars
• Chemical Signatures of the FU Ori Outbursts
• Multi-wavelength study of the low-luminosity outbursting young star HBC 722
• High Resolution Optical and NIR Spectra of HBC 722
• A Comparison of the X-ray Properties of FU Ori-type Stars to Generic Young Stellar Objects
• X-ray survey of the North-America and Pelican star-forming complex (NGC7000/IC5070)
• Accretion bursts in young intermediate-mass stars make planet formation challenging
• RW Aur A : SpeX Spectral Evidence for Differentiated Planetesimal Formation, Migration and Destruction in an 3 Myr Old Excited CTTS System
• Chandra Resolves the Double FU Orionis System RNO 1B/1C in X-rays
• On the diversification and dissipation of protoplanetary disks
• First X-ray dectection of the young variable V1180 Cas