Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50027f&link_type=abstract
Spitzer Proposal ID #50027
Physics
Scientific paper
The blue Palomar sky survey plate of the Pleiades region provides clear evidence that there is considerable dust close to the bright stars of the Pleiades. However, the network of dust filaments does not provide any unambiguous signpost for the kinematics of the dust (and gas). Radial velocity measures of interstellar absorption lines towards the bright Pleiades stars indicates that the gas is moving towards the Pleiades at a relative velocity of about 10 km/s, indicating that the gas/dust are not resident in the Pleiades but are instead transiting through the cluster. White & Bally (1993) concluded that the Pleiades was impacting the cloud from the East - and leaving a wake behind, visible in the IRAS 60 and 100 micron images of the region. Herbig & Simon (2001) imaged the brightest portion of the Merope nebula with HST, and concluded that the shape of the nebula could only be explained by the gas impacting the Pleiades from the south-southeast. Their conclusion was that the transiting cloud was an outlyer from the Taurus molecular cloud. The two explanations are not consistent. As part of a GTO program, we have obtained shallow IRAC imaging of the center of the Pleiades and have identified two stars which appear to be impacting cloud condensations at the current epoch, with extended circumstellar dust prominent at 8 um. An additional star with similar characteristics has been identified from FEPS data. A or F stars impacting moderate-density clouds should carve paraboloidal cavities in the cloud (Artymowicz and Clampin 1997), with the detailed shape of the cavity rim indicating the direction of relative motion of the star and gas. We propose deep IRAC imaging of the three stars impacting the passing cloud in order to define better the shape of their extended emission, and hence determine the motion of the gas and dust relative to the Pleiades stars.
Fazio Giovanni
Lowrance Patrick
Rebull Luisa M.
Song Inseok
Stauffer John
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