The reddest B stars.

Abstract

view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The reddest B stars. Code, A. D. ; Whitford, A. E. ; Morgan, W. W. Abstract In order to obtain data for accurate photometric distances, the colors and magnitudes of the OB stars identified by Nassau and Morgan1 are being observed photoelectrically with the Washburn I5-inch refractor and the 6o-inch telescope on Mount Wilson. Slit spectra for accurate classification of type and luminosity class are being obtained with the Yerkes 40-inch refractor. With the survey still incomplete, the number of stars now known to have large color excesses is as follows: E1> +.8o I E1 = .7o to +.79 4 E1 = +.6o to .69 8 E1 = $.5o to +.59 22 The stars added by the present survey more than double the number of stars of the above range of color excess given in the list of 1332 B stars.2 All the stars with E1 > .55 are found either between galactic longitude 3400 and 3450 or longitude 430 and 500, and are obscured by the dust cloud that forms the Great Rift. Other objects of special interest include BD + 310643, the B V star illuminating the nebula near 0 Persei, which though only about 280 parsecs away has the color excess E1 = +0.53, and suffers a visual absorption of 3.7 magnitudes. The star HD 50064 in Monoceros at 1 = 180?3 shows a color excess E1 = +0.42 in an area previously found to have very little absorption. Its distance of about 2900 parsecs suggests that it lies behind a remote dust cloud in an outer spiral arm. The spectra of several of the highly reddened supergiants show an emission spectrum. Abnormally low intensity of the diffuse interstellar band X4430 is noted in several stars of large color excess. I.Ap. J. 113, 141, 1951. 2.Stebbins, Huffer and Whitford, Ap. J. 91, 20, 1940. Washburn Observatory, University of Wisconsin, Madison, Wis., and Yerkes Observatory, Williams Bay, Wis. Publication: The Astronomical Journal Pub Date: April 1952 DOI: 10.1086/106769 Bibcode: 1952AJ.....57Q...8C full text sources ADS |