arXiv subjects

G. T. van Belle

Publications and source records attributed to G. T. van Belle.

20 records · Page 2Linked to original sources

arXiv2000

Infrared interferometric observations of young stellar objects

We present infrared observations of four young stellar objects using the Palomar Testbed Interferometer (PTI). For three of the sources, T Tau, MWC 147 and SU Aur, the 2.2 micron emission is resolved at PTI's nominal fringe spacing of 4 milliarcsec (mas), while the emission region of AB Aur is over-resolved on this scale. We fit the observations with simple circumstellar material distributions and compare our data to the predictions of accretion disk models inferred from spectral energy distributions. We find that the infrared emission region is tenths of AU in size for T Tau and SU Aur and ~1 AU for MWC 147.

astro-ph↗

arXiv1998

An Interferometric Search for Bright Companions to 51 Pegasi

We report on a near-infrared, long-baseline interferometric search for luminous companions to the star 51 Pegasi conducted with the Palomar Testbed Interferometer. Our data is completely consistent with a single-star hypothesis. We find no evidence to suggest a luminous companion to 51 Pegasi, and can exclude a companion brighter than a $Δ$K of 4.27 at the 99% confidence level for the 4.2-day orbital period indicated by spectroscopic measurements. This $Δ$K corresponds to an upper limit in the companion M$_K$ of 7.30, in turn implying a main-sequence companion mass less than 0.22 M$_{\sun}$.

astro-ph↗