Mathematics – Probability
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1403w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #14.03; Bulletin of the American Astronomical Society, Vol. 24, p.1141
Mathematics
Probability
5
Scientific paper
We have conducted high-resolution, near-infrared polarimetric imaging observations of P13S and P13N (= Parsamian 13 = IRAS 04073+3800 = GY 10), an apparent small cluster of young stellar objects located in the dark cloud L1473 at a distance of 350 pc. Our study reveals that P13N is composed of two infrared intensity peaks (P13Na and P13Nb) separated by about 5 arcsec. Both peaks appear at J (1.25 microns), H (1.6 microns) and K (2.2 microns) bands, the relative positions of the peaks are constant in all three bands, and the polarized light in the vicinity of P13Na and P13Nb shows no organized pattern. We therefore conclude that both sources are stellar. Unresolved observations of P13N had previously classified it as a T Tauri star; hence, this may be a binary T Tauri system (1800 AU projected separation). At H band our study reveals that P13S, which looks like a cometary nebula, also is composed of two infrared intensity peaks (P13Sa and P13Sb) separated by about 8 arcsec; however, only P13Sa is evident at K and only P13Sb is evident at J. The polarimetric vector maps reveal that P13Sb is a pure scattering peak and that P13Sa marks the position of the obscured source. The integrated photometry of P13S from 1981 through 1991 indicate at least 2.5 mag of variability at K, 2.3 mag at H, and 1.4 at J, where the source has experienced at least one full phase cycle. In addition, the Point Source Catalog reports that IRAS 04073+3800 has a probability of variability of 82%. Over the same baseline, P13N appears to be of constant brightness. The extreme variability of P13S over this time period may be larger than any known YSOs and make it most similar to the extreme (> 2 mag at K) variations of the Mira variable OH231.8+4.2, with which it shares an overall similarity in IRAS colors. Thus, one possibility is that P13S is an evolved star viewed along the line of sight through L1473. If so, its apparent bolometric luminosity (32 L_&sun; at 350 pc) would most likely place it several kpc beyond the dark cloud, rather than embedded within the cloud itself.
Kastner Joel H.
Weintraub David A.
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