STARSPOT-INDUCED OPTICAL AND INFRARED RADIAL VELOCITY VARIABILITY IN T TAURI STAR HUBBLE I 4
- Department of Physics and Astronomy, Rice University, 6100 Main Street, MS 108, Houston, TX 77005 (United States)
- Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States)
- Department of Astronomy, University of Texas, Robert Lee Moore Hall, Austin, TX 78712 (United States)
We report optical ({approx}6150 A) and K-band (2.3 {mu}m) radial velocities obtained over two years for the pre-main-sequence weak-lined T Tauri star Hubble I 4. We detect periodic and near-sinusoidal radial velocity variations at both wavelengths, with a semi-amplitude of 1395 {+-} 94 m s{sup -1} in the optical and 365 {+-} 80 m s{sup -1} in the infrared. The lower velocity amplitude at the longer wavelength, combined with bisector analysis and spot modeling, indicates that there are large, cool spots on the stellar surface that are causing the radial velocity modulation. The radial velocities maintain phase coherence over hundreds of days suggesting that the starspots are long-lived. This is one of the first active stars where the spot-induced velocity modulation has been resolved in the infrared.
- OSTI ID:
- 21578236
- Journal Information:
- Astrophysical Journal, Vol. 736, Issue 2; Other Information: DOI: 10.1088/0004-637X/736/2/123; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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