Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...552l..59y&link_type=abstract
The Astrophysical Journal, Volume 552, Issue 1, pp. L59-L62.
Astronomy and Astrophysics
Astronomy
4
Stars: Circumstellar Matter, Stars: Individual: Name: Haro 6-5B, Stars: Pre-Main-Sequence
Scientific paper
Aperture synthesis observations of dust continuum emission at 2 mm from the class I object Haro 6-5B, made with the Nobeyama Millimeter Array, are presented. A disklike structure that coincides with the dark lane in the visible and near-infrared images is clearly resolved with a small synthesized beam of 1.33"×1.21" with its position angle (P.A.) of 134°. The beam-deconvolved size of the disk is 2.33"×0.97" at P.A.=138deg, and the total flux density is 36.7+/-2.6 mJy. The radius and inclination angle of the disk derived from the image are 309+/-18 AU and 67deg+/-5deg, respectively. By model fitting of the spectral energy distribution of Haro 6-5B with these values, the power-law index of the dust opacity, β, is derived to be 1.05+/-0.04 and the disk mass is calculated to be 0.021+/-0.002 Msolar. No extended emission with 1000 AU scale is detected, suggesting that the envelope around Haro 6-5B has been almost dissipated and that the object is a transient source from the protostar stage to the T Tauri stage. Based on the observations made at the Nobeyama Radio Observatory, which is a branch of the National Astronomical Observatory, an interuniversity research institute operated by the Ministry of Education, Science, Sports, Culture, and Technology.
Asaki Yoshiharu
Ida Shigeru
Kawabe Ryohei
Kitamura Yoshimi
Momose Munetake
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