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  • 1
    Electronic Resource
    Electronic Resource
    Synchronous extreme spectral variability of BE Ursae Majoris (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 200-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our spectrophotometric observations were made on three consecutive nights in March 1981 and four consecutive nights in April 1981. The March data were obtained with 30 A spectral resolution in the 3,400-6,800 A range, using the intensified image dissector scanner at the 2.1 m reflector of the Kitt ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293200a0
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  • 2
    Electronic Resource
    Electronic Resource
    A kinematic model for SS433 (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 701-703 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The emitting regions giving rise to the variable wavelength systems cannot be objects in mutual orbital revolution, for with a 164-d period and velocities of 0.15 c, keplerian orbits would have light-crossing times of the order of weeks, and the blue-and red-shifted emission lines could not ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279701a0
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  • 3
    Electronic Resource
    Electronic Resource
    The nature of Aquila X-1 (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 633-634 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photoelectric photometry of nine stars in a 1 arc min field about Aql X-l was obtained in July and August 1976, using the 2.1 m reflector of the Kitt Peak National Observatory with the Cassegrain computer-photometer. Standardisation of these t/fiFdata was achieved through observations of standard ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271633a0
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  • 4
    Electronic Resource
    Electronic Resource
    SS433 continues to perplex (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 293-294 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] NEARLY a decade has passed since the popular press referred to the newly discovered object SS433 as the star that is "coming and going at the same time". Considerable observational and theoretical effort has been invested in this unique system1, which ejects two opposed, highly collimated jets of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328293a0
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  • 5
    Electronic Resource
    Electronic Resource
    A QSO in a rich, distant cluster of galaxies (1983)
    [s.l.] : Nature Publishing Group
    Nature 301 (1983), S. 221-222 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The cluster 0016 +16, at z =0.541 (rf. 2) is perhaps the best studied distant cluster of galaxies. Detailed multicolour photometry and isopleths3 show this cluster to be richer than the Coma Cluster, and remarkably normal except for its very large redshift. The brightest members have red magnitudes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/301221a0
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  • 6
    Electronic Resource
    Electronic Resource
    Surface density of faint high-redshift quasi-stellar objects (1987)
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 125-127 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although the number counts of QSOs as a function of apparent magnitude are now reasonably well determined to faint limiting magnitudes, this is certainly not the case for the redshift distribution. It has been recognized for many years that very high-redshift QSOs (z 〉 3.4) are rare, and that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/327125a0
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  • 7
    Electronic Resource
    Electronic Resource
    A companion quasar to 3C345 (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 480-481 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The QSO was discovered during a programme aimed at the identification ofoptical counterparts of X-ray sources observed serendipitously by the Einstein Observatory. The detector used, the imaging proportional counter5, yields positional accuracies of the order of 1 arc min, typically restricting ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290480a0
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular hydrogen in X-ray astronomy (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 24-25 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It seems likely that this situation also applies to many or all galactic X-ray sources. The discrepancy is easily recognised in the Crab as it is a strong source with a well defined, nonvariable, power-law spectrum extending over many decades, but many other low latitude X-ray sources show a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/249024a0
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  • 9
    Electronic Resource
    Electronic Resource
    Is HD26676 an unusual radio star? (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 137-137 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HD26676 has been classified as B8V by Cowley3 and B7V by Racine2. The main sequence assignment by Racine is based on the equivalent widths of Balmer lines. U, B, V colours by Crawford4 and Cousins5 more closely correspond to B7V with a colour excess EB-V of about 0.15 mag. The distance to HD26676 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274137a0
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  • 10
    Electronic Resource
    Electronic Resource
    Fun in the night (1988)
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 572-572 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I HAD expected to dislike this book. The dust jacket (presumably not entirely the author's fault) is overripe in the extreme. Astronomers "rip the veil from spacetime" but are not allowed to touch the controls of the huge 200-inch telescope "because they might destroy it". As an observational ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/331572b0
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