Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...572l..75b&link_type=abstract
The Astrophysical Journal, Volume 572, Issue 1, pp. L75-L78.
Astronomy and Astrophysics
Astronomy
3
Stars: Binaries: Close, Stars: Circumstellar Matter, Stars: Formation, Stars: Individual: Alphanumeric: Wl 20, Stars: Pre-Main-Sequence
Scientific paper
We present high-resolution λ=2.7 mm imaging of the close triple pre-main-sequence system WL 20. Compact dust emission with integrated flux density of 12.9+/-1.3 mJy is associated with two components of the triple system, WL 20W and WL 20S. No emission above a 3 σ level of 3.9 mJy is detected toward the third component, WL 20E, which lies 3.17" (400 AU) due east in projection from its neighbors. A possibly warped structure of ~0.1 Msolar and <=3.2" extent encompasses WL 20W and WL 20S, which have a projected separation of 2.25" (~280 AU) along a north-south axis. This structure is most likely a tidally disrupted disk surrounding WL 20S. New near-infrared spectra of the individual components show a remarkable similarity between the two T Tauri stars of the system: WL 20E has a K7 spectral type (Teff=4040 K) with rK=0.2, and WL 20W has an M0 spectral type (Teff=3800 K) with rK=0.2. The spectrum of WL 20S is consistent with that of a source intrinsically similar to WL 20W, with rK<0.9, but seen through an AV=25 in addition to the AV=16.3 to the system as a whole. Taken together, these millimeter and infrared data help explain the peculiar nature of the infrared companion, WL 20S, as resulting from a large enhancement in its dusty, circumstellar environment in relation to its companions.
Barsony Mary
Blake Geoffrey A.
Greene Thomas P.
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