Atmospheric Scintillation at Dome C, Antarctica: Implications for Photometryand Astrometry | Zendy

S. Kenyon | Zendy; Jon Lawrence | Zendy; M. C. B. Ashley | Zendy; J. W. V. Storey | Zendy; Andreï Tokovinin | Zendy; E. Fossat | Zendy

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Atmospheric Scintillation at Dome C, Antarctica: Implications for Photometryand Astrometry

Author(s) -

S. Kenyon,

Jon Lawrence,

M. C. B. Ashley,

J. W. V. Storey,

Andreï Tokovinin,

E. Fossat

Publication year - 2006

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/505409

Subject(s) - astrometry , dome (geology) , scintillation , geology , physics , turbulence , remote sensing , meteorology , stars , astronomy , optics , geomorphology , detector

We present low-resolution turbulence profiles of the atmosphere above Dome C,Antarctica, measured with the MASS instrument during 25 nights in March-May2004. Except for the lowest layer, Dome C has significantly less turbulencethan Cerro Tololo and Cerro Pachon. In particular, the integrated turbulence at16 km is always less than the median values at the two Chilean sites. Fromthese profiles we evaluate the photometric noise produced by scintillation, andthe atmospheric contribution to the error budget in narrow-angle differentialastrometry. In comparison with the two mid-latitude sites in Chile, Dome Coffers a potential gain of about 3.6 in both photometric precision (for longintegrations) and narrow-angle astrometry precision. These gain estimates arepreliminary, being computed with average wind-speed profiles, but the validityof our approach is confirmed by independent data. Although the data from Dome Ccover a fairly limited time frame, they lend strong support to expectationsthat Dome C will offer significant advantages for photometric and astrometricstudies.Comment: 12 pages, 5 figures, accepted by PASP 26th April, 200

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