X-ray emission from an FU Orionis star in early outburst: HBC 722
- Author(s)
- Armin Liebhart, Manuel Güdel, Stephen Lee Skinner
- 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 L
X ≠4 × 10
30 ergs 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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of Colorado, Boulder
- Journal
- Astronomy & Astrophysics
- Volume
- 570
- No. of pages
- 4
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201424841
- Publication date
- 10-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/669785c0-22c5-4a87-95ed-240eed31bfbd