WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to... more WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3cm aperture F/2.8 Apogee 10 CCD camera (2Kx2K chip, 16-arcsec pixels). The camera is mounted piggy-back on a commercial 10-inch Meade telescope. We
ABSTRACT WASP0 is a prototype for what is intended to become a collection of WASPs whose primary ... more ABSTRACT WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3cm aperture F/2.8 Apogee 10 CCD camera (2Kx2K chip, 16-arcsec pixels). The camera is mounted piggy-back on a commercial 10-inch Meade telescope. We present some recent results from the WASP camera, including observations from La Palma of the known transiting planet around HD 209458 and preliminary analysis of other stars located in the same field. We also outline further problems which restrict the ability to achieve photon limited precision with a wide-field commercial CCD.
Two of the most important predictions from standard stellar evolution theory about the lithium de... more Two of the most important predictions from standard stellar evolution theory about the lithium depletion of solar-type F and G dwarfs are that it occurs primarily during the pre-main sequence and that it depends on metallicity. Abundant evidence from star clusters shows that Li depletion does indeed occur during the pre-main sequence, but then also continues during the main sequence,
We have identified a well-populated class of young stellar objects (YSOs) in the Orion Nebula clu... more We have identified a well-populated class of young stellar objects (YSOs) in the Orion Nebula cluster whose light curves show narrow (few day timescale) flux dips. Based on comparison to the only previously well-documented member of this class (AA Tau), we believe these flux dips are due to 'clouds' in the inner circumstellar disk of these stars that pass through
Using the Blanco 4m+HYDRA, we propose to obtain intermediate resolution spectra of an optically s... more Using the Blanco 4m+HYDRA, we propose to obtain intermediate resolution spectra of an optically selected sample of early-G to mid-M photometric members of the young (220 Myr) open cluster NGC 6475, which lies mid-way in age between the Hyades and Pleiades. These spectra will enable us to measure radial velocities and Li equivalent widths (for abundances). Because NGC 6475 lies in the Galactic plane (b=-4.5^o), we estimate that only 30-40 % of the photometric members are bona fide cluster members, the remainder being contaminating field stars. It is essential to obtain a further membership criterion (radial velocities) to establish a solid cluster membership list of genuine members. Furthermore, we will measure lithium equivalent widths (and determine abundances) for the bona fide cluster members. These abundances will allow us to trace the evolution of lithium depletion during the main sequence at intermediate ages, and allow us to examine whether the spread in Pleiades K-star Li ab...
... but this explanation also has its weaknesses, as the star seems chemically normal, has normal... more ... but this explanation also has its weaknesses, as the star seems chemically normal, has normal space motions, and is not an X-Ray source. ... MNRAS, 309, L19 Handler, G. & Shobbrook, RR 2002, MNRAS, in preparation Koen, C., Van Rooyen, R., Van Wyk, F., & Marang, F. 1999 ...
WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to... more WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3cm aperture F/2.8 Apogee 10 CCD camera (2Kx2K chip, 16-arcsec pixels). The camera is mounted piggy-back on a commercial 10-inch Meade telescope. We
ABSTRACT WASP0 is a prototype for what is intended to become a collection of WASPs whose primary ... more ABSTRACT WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3cm aperture F/2.8 Apogee 10 CCD camera (2Kx2K chip, 16-arcsec pixels). The camera is mounted piggy-back on a commercial 10-inch Meade telescope. We present some recent results from the WASP camera, including observations from La Palma of the known transiting planet around HD 209458 and preliminary analysis of other stars located in the same field. We also outline further problems which restrict the ability to achieve photon limited precision with a wide-field commercial CCD.
Two of the most important predictions from standard stellar evolution theory about the lithium de... more Two of the most important predictions from standard stellar evolution theory about the lithium depletion of solar-type F and G dwarfs are that it occurs primarily during the pre-main sequence and that it depends on metallicity. Abundant evidence from star clusters shows that Li depletion does indeed occur during the pre-main sequence, but then also continues during the main sequence,
We have identified a well-populated class of young stellar objects (YSOs) in the Orion Nebula clu... more We have identified a well-populated class of young stellar objects (YSOs) in the Orion Nebula cluster whose light curves show narrow (few day timescale) flux dips. Based on comparison to the only previously well-documented member of this class (AA Tau), we believe these flux dips are due to 'clouds' in the inner circumstellar disk of these stars that pass through
Using the Blanco 4m+HYDRA, we propose to obtain intermediate resolution spectra of an optically s... more Using the Blanco 4m+HYDRA, we propose to obtain intermediate resolution spectra of an optically selected sample of early-G to mid-M photometric members of the young (220 Myr) open cluster NGC 6475, which lies mid-way in age between the Hyades and Pleiades. These spectra will enable us to measure radial velocities and Li equivalent widths (for abundances). Because NGC 6475 lies in the Galactic plane (b=-4.5^o), we estimate that only 30-40 % of the photometric members are bona fide cluster members, the remainder being contaminating field stars. It is essential to obtain a further membership criterion (radial velocities) to establish a solid cluster membership list of genuine members. Furthermore, we will measure lithium equivalent widths (and determine abundances) for the bona fide cluster members. These abundances will allow us to trace the evolution of lithium depletion during the main sequence at intermediate ages, and allow us to examine whether the spread in Pleiades K-star Li ab...
... but this explanation also has its weaknesses, as the star seems chemically normal, has normal... more ... but this explanation also has its weaknesses, as the star seems chemically normal, has normal space motions, and is not an X-Ray source. ... MNRAS, 309, L19 Handler, G. & Shobbrook, RR 2002, MNRAS, in preparation Koen, C., Van Rooyen, R., Van Wyk, F., & Marang, F. 1999 ...
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