Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.3201f&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #32.01D; Bulletin of the American Astronomical Society, Vol. 25, p.1340
Other
Scientific paper
We searched for 10 microns silicate emission from circumstellar dust in 13 main-sequence stars that possibly exemplify the beta Pictoris phenomenon. We have previously detected the silicate feature in 51 Oph (Fajardo-Acosta, Telesco, & Knacke 1993, ApJ, in press) through mid-IR narrowband spectrophotometry (FWHM ~ 1 microns) with the MSFC Big Mac camera and the 2--30 microns Facility bolometer at the IRTF. We are using the same instrumentation in our survey of other Vega-type disks. These observations were motivated by the detection of the silicate feature in beta Pic (Telesco & Knacke 1991, ApJ, 372, L29). We followed the detections in beta Pic and 51 Oph with 2.9--13.5 microns intermediate-resolution (lambda /Delta lambda ~ 50) spectroscopy with the Aerospace Corp. Infrared Spectrograph. The higher resolution data confirmed the analogy of the silicate features in beta Pic (Knacke et al. 1993, ApJ, in press) and 51 Oph (Russell et al. 1993, in prep.) to similar features in Solar System cometary spectra. Among the Vega-type stars we recently observed, beta UMa, zeta Lep, sigma Her, and gamma Oph exhibit significant dust emission at 10 microns (>= 0.15 Jy). We expect to resolve whether silicate emission is present with the higher spectral resolution available with the Aerospace Spectrograph. We have compared the spectrum of beta Pic with those in the data compilation of the IRAS Low Resolution Spectrograph. Of the 5425 sources, 88 exhibit 10 microns silicate emission features that match beta Pic's reasonably well. Many of these sources do not have known associations; those that do are typically low-mass giant branch Miras or massive supergiants. We are investigating at least 5 possible associations with early-type main-sequence stars. This research was sponsored by the NASA Origins of Solar Systems Research Program under grant NAGW-2334.
Fajardo-Acosta Sergio Bernabe
Knacke Roger F.
Telesco Charles M.
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