Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.1112l&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #11.12; Bulletin of the American Astronomical Society, Vol. 32, p.1418
Astronomy and Astrophysics
Astronomy
Scientific paper
We have discovered an extremely red object located 7 arcsec southwest (P.A. 233 deg) of the bright binary system HD 155826. Originally reported by IRAS as one source detected at 12-100 μ m, within the error ellipse of HD 155826, two bright point sources were found in infrared images obtained with the NSFCAM and MIRLIN cameras at the IRTF and confirmed by the LWS camera on Keck I. HD 155826 is easily detected in the NSFCAM z, J, H, and K images, but there is no apparent counterpart for the new source down to mag ~14th at Gunn z, J, nor is an object found in the Aladin sky catalogue. The detection of the second, bright red source explains the confusing K-(IRAS 12μ m) colors originally assigned to HD 155826 as a possible Vega-like system. While 7" corresponds to 140 AU at the distance of HD 155826, as the field is within 12 deg. of the Galactic center and ≈7' from the Galactic plane, it is very possible that the two sources are associated by confusion only. >From the lack of an optical counterpart and the bright mid-IR flux, we suspect the object to be either a highly reddened carbon star with a thick shell or an embedded protostar. Our next major step will be to distinguish between these two possibilities by measuring the 5-20μ m SED with medium to high spectral resolution to search for the strong 8-10μ m absorption due to SiC found in extreme carbon stars.
Backman Dana
Christian Damian
Djorgovski George
Fernandez Yanga
Golisch Bill
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