Preliminary Results from a Search for a Nebula in the Vicinity of Sirius

Details Preliminary Results from a Search for a Nebula in the Vicinity of Sirius Preliminary Results from a Search for a Nebula in the Vicinity of Sirius

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18111404m&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #114.04; Bulletin of the American Astronomical Society, Vol. 24, p.1301

Astronomy and Astrophysics

Astronomy

Scientific paper

Ptolemy, Seneca, and several Babylonian and mediaeval texts have described Sirius (now A1V for the visible component) as a red star (Gry and Bonnet-Bidaud 1990, Schlosser and Bergman 1985). If true, then the present color of Sirius would be very difficult to explain in terms of current theories of stellar evolution. A possible explanation is that Sirius was eclipsed by a small, dark nebula such as a Bok globule (see Gry and Bonnet-Bidaud 1990). To search for such an object J, H, K, and CO (near 2.4 mu ) imaging of the stellar field near Sirius' apparent postion of 2000 years ago was performed using the University of Arizona's 256x256 IR array on their 61-inch Mt Bigelow telescope. Preliminary (J-H) vs. (H-K) diagrams indicate the presence of color excesses in the area of study (following the methods of Jones et al. 1980, 1984). Examination of the Palomar Sky Survey plates for the region of interest shows several areas where the stellar number density is more than 3 sigma smaller than the average stellar density for that area of the sky. Also, the stellar density for these depleted regions is higher on the red Palomar plate than the number density of the regions on the blue plate, suggesting a redder stellar population in these regions, which may be due to the presence of intervening material.

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