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Ten Micron Photometry of 25 Stars from B8 To M7

Wildey, Robert L. and Murray, Bruce C. (1963) Ten Micron Photometry of 25 Stars from B8 To M7. Division of Geological and Planetary Sciences Contribution, 1175. California Institute of Technology , Pasadena, CA.

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A photometer employing a liquid hydrogen-cooled mercury-doped germanium photoconductor whose spectral response is limited to the 8 - 14 µ region by a low pass interference filter and a BaF_2 window coupled with the cell's threshold wavelength has been placed at the east arm Cassegrain focus of the 200 inch Hale telescope. Twenty-five stars have been measured. The earliest star for which two measurements have been obtained is the B8Ia star β Orionis. The latest star is the M7e star X Cygni. The brightest star, L37 X 10^(-14) watts/cm^2, is α Orionis. The carbon star DS Peg was also measured. In a two-color diagram formed with B and V there is an intrinsic increase in dispersion going to later type stars and a systematic trend away from the blackbody relation. The ratios of the stellar fluxes to those expected from blackbodies at the published stellar effective-temperatures and angular diameters are not far from one. A systematic trend exhibited may not be real because of the assumptions involved in inteferometric diameter determinations. DS Peg does not appear overly peculiar in the two-color plots, but X,Cygni falls on the opposite side of the blackbody curve ("blue excess") compared with most of the late type stars. The fluxes presented here have not been corrected for presently uncertain telescope transmission losses which may be important.

Item Type:Report or Paper (Report)
Alternate Title:10 mu photometry of 25 stars from B8 to M7, 10 μ photometry of 25 stars from B8 to M7
Additional Information:© 1963 Submitted to the Astrophysical Journal May 13, 1963. Updated/Added to NTRS: May 09, 2012. NSG-56-60. Contribution No. 1175 of the Division of Geological Sciences of the California Institute of Technology, Pasadena, California. The original contribution of Mr. James A. Westphal to the design and development of the specialized instrumentation used in this investigation and his assistance in gathering some or the observations have been of inestimable value. The observing assistance of Messrs Dowell Martz, Ralph Wilson, Howard Pohn, Kenneth Watson, and Dr. Gerry Neugebauer is gratefully acknowledged. We wish to express particular thanks to the Mount Wilson and Palomar Observatories for permission to use the 200 inch telescope, and for continued help and encouragement. It is a pleasure to thank Dr. R. P. Kraft and Dr. J. B. Oke for critical readings of the manuscript. This research has been supported by the National Aeronautics and Space Administration under Grant NsG 56-60 ani by the National Science Foundation under Grant G-25210.
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NASANsG 56-60
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Other Numbering System NameOther Numbering System ID
NASA Technical ReportCR-50143
Series Name:Division of Geological and Planetary Sciences Contribution
Issue or Number:1175
Record Number:CaltechAUTHORS:20120921-080107787
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Official Citation:TEN MICRON PHOTOMETRY OF 25 STARS FROM B8 TO M7 Online Source: Click to View PDF File [PDF Size: 6.5 MB] Author: Murray, B. C.; Wildey, R. L. Abstract: Ten micron photometry of stars NASA Center: NASA (Unspecified Center) Publication Year: 1963 Document ID: 19630007152 Accession Number: 63N17028 Report/Patent Number: NASA-CR-50143 Updated/Added to NTRS: May 09, 2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34276
Deposited By: Ruth Sustaita
Deposited On:21 Sep 2012 19:33
Last Modified:03 Oct 2019 04:17

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