Accurate measurement of the displacement between the line and continuum emitting regions in LkH-alpha101

Details Accurate measurement of the displacement between the line and continuum emitting regions in LkH-alpha101 Accurate measurement of the displacement between the line and continuum emitting regions in LkH-alpha101

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..747s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 747-753.

Astronomy and Astrophysics

Astronomy

1

Binary Stars, Companion Stars, Focal Plane Devices, H Alpha Line, Infrared Photometry, Infrared Spectrometers, Early Stars, Gratings (Spectra), Infrared Telescopes, Stellar Envelopes

Scientific paper

We report a new technique which combines a near-IR grating spectrometer with a broadband IR photometer, each with a narrow slit for an entrance aperture, to achieve accurate measurement of the positional offset between an emission line region and an underlying continuum source. Thousands of repeated rapid scans of the star image across the pair of slits, which are parallel and close together in the focal plane, combine to distinguish centroid offsets on scales as small as 0.01 arcsec (1 sigma). For the 4-micron observations reported here, each 15-arcsec scan lasts 0.3 s, ensuring that the atmospheric distortion of the star image is similar at each of the two slits. LkH-alpha101, a massive premain-sequence object, provides an ideal test case since it is both a bright Brackett-alpha line source and a prominent 4-micron continuum source. The combined results of more than 2000 scans of LkH-alpha101 suggest an offset of 0.022 +/- 0.0082 arcsec between the Br-alpha and 4-micron continuum emission in the North-South direction. At the distance of LkHα101 (about 800 pc) this displacement corresponds to 20 AU. If the observed offset is real, it could result from an infrared luminous binary companion or an ultracompact H II region. No offset is apparent in the east-west direction.

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