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  • 1
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    The wide field/planetary camera (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A wide site of potential astronomical and solar system scientific studies using the wide field planetary camera on space telescope are described. The expected performance of the camera as it approaches final assembly and testing is also detailed.
    Keywords: ASTRONOMY
    Type: Space Telescope Science Inst. The Space Telescope Obs.; p 28-39
    Format: text
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  • 2
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    A radial-velocity survey of the Hyades (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Photoelectric radial-velocity measurements, obtained with external error as small as 0.1 km/s using the 200-inch Hale telescope at Palomar Observatory during the period 1971-1986, are reported for over 400 candidate members (with V magnitude between 6 and 14) of the Hyades cluster. The history of Hyades observations is recalled; the Palomar instrumentation and observing program are described; the data-reduction and standardization procedures are discussed in detail; and the data are presented in extensive tables and graphs. About 200 of the stars are classified as cluster members, including 60 spectroscopic binaries.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 96; 172-197
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  • 3
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    Spectroscopic orbits for 16 more binaries in the Hyades field (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A photoelectric survey of the radial velocities of Hyades candidates has provided data for 16 spectroscopic binary orbits, in addition to the 11 known binaries in the Hyades field. The majority of photoelectric observations in the survey were carried out at the Cambridge and Palomar Observatories using different data reduction techniques for determining radial velocities. It is found that two of the objects, vB 164 and J336, are definitely not members of the Hyades cluster; two other objects, HD 16909 and J301, appear to be located far from the center of the cluster, but still deserve classification as Hyades members. The gamma-velocity of HD 16909 differed slightly from the value expected for a member of the Hyades cluster. An additional twelve systems were definitely identified as members of the Hyades. The radial velocity values for all the candidate stars are given in a series of tables.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 90; 609-642
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  • 4
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    Secondary standard stars for absolute spectrophotometry (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Based on an adopted absolute spectral energy distribution for the primary standard star Alpha Lyrae, absolute fluxes are given for the four very metal-deficient F type subdwarfs HD 19445, HD 84937, BD + 26.2606 deg, and BD + 17.4703 deg. Somewhat inferior data are also given for HD 140283. The data are given for 40-A bands and cover the wavelength range from 3080 A to 12,000 A. The four stars, all near magnitude 9 and distributed around the sky, are intended as secondary standards for absolute spectrophotometry.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 266
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  • 5
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    The triple quasar Q1115+080A, B, C - A quintuple gravitational lens image (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Spectroscopy and direct imaging of Q1115+080A, B, C with a CCD camera support the hypothesis that they are gravitational images of a single object. Spectroscopy of the semiforbidden C III 1909-A emission line shows all the images to have identical spectra and redshifts (to within 100 km/s), except that B is slightly redder. Gravitational lens imaging by a massive spiral galaxy is investigated, and a quintuple image model resembling Q1115+080A, B, C is found. In this model, Q1115+080A is a highly magnified close pair of images oriented in the position angle 23 deg. An elongation Q1115+080A at this angle is seen in the CCD pictures.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 244
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  • 6
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    The photometric properties of brightest cluster galaxies. I - Absolute magnitudes in 116 nearby Abell clusters (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two-color aperture photometry of the brightest galaxies in a complete sample of nearby Abell clusters is presented. The results are used to anchor the bright end of the Hubble diagram; essentially the entire formal error for this method is then due to the sample of distant clusters used. New determinations of the systematic trend of galaxy absolute magnitude with the cluster properties of richness and Bautz-Morgan type are derived. When these new results are combined with the Gunn and Oke (1975) data on high-redshift clusters, a formal value (without accounting for any evolution) of q sub 0 = -0.55 + or - 0.45 (1 standard deviations) is found.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 241
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  • 7
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    The extragalactic nature of CL4 (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The variable, unresolved radio source CL4 (2048 + 312) is identified as a quasar, in light of spectroscopy of its faint optical counterpart which shows a single, broad emission line at 6480 A. Although candidate redshifts of 1.31, 2.39, and 3.18 are proposed for identification of the emission feature as Mg II, semiforbidden C III, and C IV, respectively, the precise redshift cannot be determined without an extension of the current spectral coverage of this red object into the blue. CL4, together with the radio source 1910 + 052, which shows similar properties and for which an optical identification search was unsuccessfully conducted, is part of a group of eight compact, variable radio sources which may be related to SS 433. A compilation of evidence for this association shows that none of the eight objects are good candidates for an SS 433 analog.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 249
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  • 8
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    M5 V101 - A close binary system in a globular cluster (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Spectrophotometric and photographic observations of the large amplitude variable V101 in the globular cluster M5 show it to have the characteristics of a dwarf nova. In particular, a spectrum obtained with the Hale 5 m reflector of the object in quiescence (V approximately equal to 20) shows strong, broad Balmer and He I emission. It is suggested that M5 V101 is the strongest case for the existence of close binary systems in globular clusters.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 247
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  • 9
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    A systematic survey for distant galaxy clusters (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A photographic survey for faint clusters of galaxies has been carried out with fine-grained photographic emulsions using the 1.2 m Schmidt and 5 m Hale telescopes, as well as the 4 m Mayall telescope. A total of 418 clusters have been found with redshifts mostly in the range from 0.15 to 0.92. The survey was planned to minimize distance-dependent selection effects in the resulting catalog. In areas of sky where the deepest search was made, the sample is complete to about z = 0.50; there are 11 clusters per square degree at this limit. At a redshift of 1.0 there should be 63 or 45 clusters per square degree depending on whether q0 is 0.0 or 0.5, provided there is no evolution.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 306; 30-37
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