Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...503l.193f&link_type=abstract
Astrophysical Journal Letters v.503, p.L193
Astronomy and Astrophysics
Astronomy
1
Errata, Addenda
Scientific paper
In the Letter "Infrared Space Observatory Mapping of 60 Micron Dust Emission around Vega-type Systems" by S. B. Fajardo-Acosta, R. E. Stencel, and D. E. Backman (ApJ, 487, L151 [1997]), there is an error in the equatorial coordinates that we assigned to our maps. Using preliminary versions of the PHOT Interactive Analysis (PIA) program, we incorrectly labeled the PHOT C-100 array axes as if they were aligned with equatorial coordinates. We rereduced our PHOT maps with a more recent version of PIA, version 6.3. The orientation of the C-100 array relative to equatorial coordinates, unique to each mapping observation, is now properly taken into account. This orientation is indicated by the scan direction vector plotted in Figures 2a ( alpha PsA) and 2b ( alpha Boo) of our Letter. The scan direction of the map of gamma Oph, in which we found hints of extended emission (Figs. 1c and 1d of our Letter), is along P.A. 184 degrees, very close to the scan direction of the map of alpha Boo (P.A. 186 degrees). Therefore, the one-dimensional profile cuts in these maps should be reinterpreted as hinting at extended emission being present north and south of gamma Oph. Below we show a corrected version of Figure 2 of our Letter. The maps of alpha PsA (Fig. 2a) and alpha Boo (Fig. 2b) are now properly rotated relative to equatorial coordinates. The morphology of these maps is slightly different from that of our Letter. The reason is that the point-spread function model from alpha Boo is now rotated relative to the map of alpha PsA by the difference in the scan directions of these two maps (29 degrees clockwise). Corrected Figure 2a shows that the inferred disk around alpha PsA is aligned nearly north-south, or 12^° +/- 13^° west of north. This orientation is consistent with previous inferences from 60 mu m IRAS scans by F. C. Gillett (in Light on Dark Matter, ed. F. P. Israel [Dordrecht: Reidel], 61 [1986]), which suggested that extended emission was present along 29 degrees west of north. A recent 850 mu m image of alpha PsA by W. S. Holland et al. (Nature, 392, 788 [1998]) shows extended emission along 18^° +/- 4^° west of north, thus also consistent with our corrected measurement.
Backman Dana E.
Fajardo-Acosta Sergio Bernabe
Stencel Robert E.
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