Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9047c&link_type=abstract
HST Proposal ID #9047
Computer Science
Hst Proposal Id #9047 Cold Stars
Scientific paper
Rapidly rotating main-sequence stars are so heavily mottled by starspots that rotational modulation of their light may amount to 0.1 magnitude or more. Over the last decade or so, the spatial distributions of the largest starspot groups have been mapped on many active stars using Doppler imaging methods applied to ground-based echelle spectroscopy. In rapidly rotating young main-sequence stars with ages comparable to the Pleiades, Doppler images seldom show more than 10 methods such as TiO band-strength analysis and broad-band optical and near-IR photometry, however, indicate that 20 active stars' surfaces are occupied by spots. The discrepancy can be resolved by requiring the brighter regions of an active stellar surface to be packed with a high density of dark spots, too small to be resolved in Doppler images. Here we propose to measure the packing fraction and size distribution of small starspots on the inner face of the G2/3V primary of the eclipsing binary SV Cam {= HD 44982}. We will observe three primary eclipses at the exquisite photometric precision {1.3* 10^-4 mag RMS with time resolution 50s} attainable by using STIS as a bright-star photometer. Starspots with radii as small as 15000 km will be detected as marginally-resolved, 5Sigma fluctuations in the eclipse profile as the dark K5 secondary scans across the disk of the primary.
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