Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542904d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #429.04; Bulletin of the American Astronomical Society, Vol. 42, p.350
Astronomy and Astrophysics
Astrophysics
Scientific paper
A world-wide campaign of spectroscopy and photometry was carried out for 17 days in February- March 2007 (JD 2454147 - 2454164) in support of an extended CHANDRA HETG observation of the nearby accreting T Tauri star: TW Hya (CD -34 7151).This program included photometry from Super WASP-South and SAAO. Spectroscopy was obtained from TNG/SARG, Vainu Bappu Observatory, SAAO, MSSO, Magellan/MIKE, Pico do Dios, and Gemini-S. The photometric period of the star derived from the periodogram of WASP-S photometry during this time was 4.76+/-0.01 d. Hα fluxes do not appear to correlate well with the photometric period nor the total X-ray flux, perhaps influenced by flaring that occurred in both optical and X-ray sequences during this time. Hα profiles from TW Hya can change dramatically during a night, with substantial systematic changes in the wind opacity signaled both in Hα and the He I 10830 Å transition. Related posters by Schneider et al., and Wolk et al. address the optical veiling and X-ray spectrum of TW Hya from this program.
Research supported in part by NASA and the Smithsonian Astrophysical Observatory.
Bessell Michael S.
Brickhouse Nancy S.
Cranmer Steven R.
Crause Lisa A.
Dupree Andrea K.
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