TW Hydrae astrometric parameters measurement
نویسندگان
چکیده
منابع مشابه
Silicate Emission in the TW Hydrae Association
The TW Hydrae Association is the nearest young stellar association. Among its members are HD 98800, HR 4796A, and TW Hydrae itself, the nearest known classical T Tauri star. We have observed these three stars spectroscopically between 3 and 13 μm. In TW Hya the spectrum shows a silicate emission feature that is similar to many other young stars with protostellar disks. The 11.2 μm feature indic...
متن کاملImaging the Disk around Tw Hydrae with the Submillimeter Array
We present ∼2 –4 aperture synthesis observations of the circumstellar disk surrounding the nearby young star TW Hya in the CO and lines and associated dust continuum obtained with the partially J p 2–1 J p 3–2 completed Submillimeter Array. The extent and peak flux of the 230 and 345 GHz dust emission follow closely the predictions of the irradiated accretion disk model of Calvet et al. The res...
متن کاملExploring Terrestrial Planet Formation in the Tw Hydrae Association
Spitzer Space Telescope infrared measurements are presented for 24 members of the TW Hydrae association (TWA). High signal-to-noise 24 μm photometry is presented for all of these stars, including 20 stars that were not detected by IRAS. Among these 20 stars, only a single object, TWA 7, shows excess emission at 24 μm and at the level of only 40% above the star’s photosphere. TWA 7 also exhibits...
متن کاملHIGH-RESOLUTION SPECTROSCOPY OF [Ne ii] EMISSION FROM TW HYDRAE
Wepresent high-resolution echelle spectra of [Ne ii] 12.81 memission from the classical TTauri star (CTTS) TWHya, obtainedwithMICHELLE onGemini North. The line is centered at the stellar radial velocity and has an intrinsic FWHM of 21 4 km s . The line width is broader than other narrow emission lines typically associated with the disk around TW Hya. If formed in a disk, the line broadening cou...
متن کاملHow Hot Is the Wind from Tw Hydrae?
It has recently been suggested that the winds from classical T Tauri stars in general, and the wind from TWHya in particular, reaches temperatures of 300,000 Kwhile maintaining a mass-loss rate of 10 M yr 1 or larger. If confirmed, this would place strong new requirements on wind launching and heating models. We therefore reexamine spectra from the Space Telescope Imaging Spectrograph aboard th...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2007
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921308019984