Search Results - (Author, Cooperation:D. D. Sasselov)

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  1. 1
    Staff View
    Publication Date:
    2011-12-22
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Sasselov, D. D. ; Kolev, D. Z.
    Springer
    Published 1986
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have obtained high-dispersion blue spectograms and BV photometry of the high-latitude F-supergiant HR 4912=HD 112374. As a result of our curve-of-growth analysis we conclude that it appears to have the parameters of a F-supergiant with slight metal deficiency ([Fe/H]=−0.7). The latter depends much upon the derived temperature of HR 4912, hence we pay special attention to this problem. Our blue spectra and new BV photometry made it possible to obtain four independent estimates of the temperature-better than in the previous two studies of HR 4912 in the UV and red regions. Despite all recent efforts in a wide spectral region the status and origin of HR 4912 remains as yet not established, although it seems to stand much closer to the stars of the UU Herculis type.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00653955

    Articles: DFG German National Licenses
  3. 3
    Sasselov, D. D.
    Springer
    Published 1984
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A general review of the group of UU Her-type stars proposed recently as a possible new type of variables is given. The available observations (spectra and photometry) reveal them as luminous Population I F-type supergiants of normal composition. This fact contradicts their great distances above the galactic plane. As there is no reason so far to distrust the results from the spectroscopic analyses and photometry, the galactic plane should be excluded as a possible birthplace of the UU Her-stars. In this respect they might probably indicate that recent star formation (though occasional) from already enriched material was possible at high galactic latitudes. Moreover, normal Main-Sequence B-stars seem now also to be found there. Much attention is paid to the specific semiregular variability of the UU Her-stars. The type of pulsations remains conjectural, but simple radial pulsations should obviously be ruled out.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00651069

    Articles: DFG German National Licenses
  4. 4
    Sasselov, D. D.
    Springer
    Published 1993
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00657918

    Articles: DFG German National Licenses