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  • ASTRONOMY  (4)
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  • 1
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    Long-term infrared monitoring of stellar sources from earth orbit (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A program is discussed which involved monitoring the photometric activity of 18 bright variable IR stars at 2.7 microns with satellite- and rocket-borne instrumentation in the period from 1971 to 1975. The stellar sample includes 3 Lb variables, 8 semiregular variables, 5 Mira-type variables, and 2 previously unknown and unclassified IR variables. Detailed light curves of many of these stars were determined for intervals of 3 yr or more; spectra from 2.7 to 20 microns were constructed for nine of them using data obtained entirely with instruments above the atmosphere. Photometric IR light curves and other data are presented for SW Virginis, R Aquilae, S Scuti, IRC 00265, RT Hydrae, S Orionis, S Canis Minoris, Omicron Ceti, and R Leonis. Several hypotheses concerning the interpretation of the IR data are examined.
    Keywords: ASTRONOMY
    Type: COSPAR, Plenary Meeting; Jun 08, 1976 - Jun 19, 1976; Philadelphia, PA
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    NASA TECHNICAL REPORTS
  • 2
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    Satellite observations of new infrared sources (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary results are reported for satellite observations of about 1000 IR sources at a wavelength of 2.7 microns. The observations were made in the declination zone between +10 and -10 deg to a limiting flux of 4 by 10 to the -16th power W/sq cm per micron. Of 83 previously unobserved sources, twenty are identified with late-type stars having visual magnitudes of 6 to 9. The nine sources with available luminosity classifications are found to be giant stars, and flux densities at 2.2 and 3.6 microns are predicted for four unreddened stars among these. Three other detected sources are positively identified with red variable stars; twenty more are tentatively identified as such. It is suggested that some of the 40 blank-field 2.7-micron sources detected at high galactic latitude may be Mira variables with thick dust shells located at large distances from the galactic plane.
    Keywords: ASTRONOMY
    Type: Plenary Meeting; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
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    NASA TECHNICAL REPORTS
  • 3
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    Characteristics of IR variable stars as observed from orbit (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A selection of infrared variable stars was studied at wavelength 2.7 microns during 1971-1975 with data from U.S. Air Force satellites. Stars observed in this program are classified as long-period variable stars, semiregular variables, and irregular variables and are among the strongest stellar sources at this wavelength. In addition, a few new, as yet unclassified variable stars were identified during the course of the investigation. Time scales of reproducible variations range from a few weeks to a few years, and amplitudes of variation are as large as a factor of three for stars with periods of order one year. The minimum infrared flux density of a long-period star repeats accurately from one cycle to the next, whereas the maximum flux density was found to be unstable. The correlation of 2.7 micron and radio emission line data from one, well-studied long-period variable is consistent with the hypothesis that the H2O and OH circumstellar masers are saturated, if pumped by the stellar infrared flux near 2.7 microns.
    Keywords: ASTRONOMY
    Type: Seminar on Modern utilization of infrared technology II: Civilian and military; Aug 26, 1976 - Aug 27, 1976; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 4
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    Distribution of astronomical sources in the second Equatorial Infrared Catalogue (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Measurements of infrared (2.7-micron) source positions and flux densities have been derived based on an additional 60.6 hours of satellite observations beyond those considered in the preparation of the Equatorial Infrared Catalogue No. 1 (EIC-1). These data have been processed together with the EIC-1 data to produce EIC-2. The new catalog differs from EIC-1 as follows: there are 1278 sources; there is a larger percentage of unidentified sources; there are increased numbers of sources identified with Two-Micron Sky Survey sources, AFGL sources, AGK3 stars and SAO stars.
    Keywords: ASTRONOMY
    Type: Modern utilization of infrared technology V; August 29, 30, 1979; San Diego, CA
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