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  • 1
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    The distribution of rotational velocities for low-mass stars in the Pleiades (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The available spectral type and color data for late-type Pleiades members have been reanalyzed, and new reddening estimates are obtained. New photometry for a small number of stars and a compilation of H-alpha equivalent widths for Pleiades dwarfs are presented. These data are used to examine the location of the rapid rotators in color-magnitude diagrams and the correlation between chromospheric activity and rotation. It is shown that the wide range of angular momenta exhibited by Pleiades K and M dwarfs is not necessarily produced by a combination of main-sequence spin-downs and a large age spread; it can also result from a plausible spread in initial angular momenta, coupled with initial main-sequence spin-down rates that are only weakly dependent on rotation. The new reddening estimates confirm Breger's (1985) finding of large extinctions confined to a small region in the southern portion of the Merope nebula.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 318; 337-355
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  • 2
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    Rotation and kinematics of the premain-sequence stars in Taurus-Auriga with Ca II emission (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Radial velocities and v sin i values for the stars in the Taurus-Auriga region that were found to have strong Ca II H and K emission by Herbig, Vrba, and Rydgren 'HVR', (1986) are reported. Most of the velocities are determined to better than 2 km/s precision. The kinematic properties of the Ca II emission stars with strong Li are found to be indistinguishable from conventional T Tauris in Taurus-Auriga, contrary to HVR. These Li-rich stars also rotate like T Tauris. Most of the stars that lack Li are probable or possible members of the Hyades, in the foreground, and are among the brightest and most active stars in that cluster for their spectral types. It is suggested following Jones and Herbig (1979), that the apparent absence of low-mass stars older than 10 Myr in Taurus-Auriga is real, and is due to the finite lifetime of the cloud.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 93; 907-912
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  • 3
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    Further evidence for differential rotation in V1057 Cygni (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Further tests of the accretion disk hypothesis for FU Orionis objects are presented. High spectral resolution, high signal to noise, 5820-6830 A and 7500-9370 A spectra of V1057 Cyg reveal a correlation between linewidth and line transition lower excitation potential expected from this hypothesis. The magnitude of the effect compares favorably with that predicted by synthetic disk spectra. Additional evidence for previously documented spectral type and linewidth versus wavelength correlations is also presented. This kinematic evidence strongly supports the accretion disk hypothesis.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 349; 328-334
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  • 4
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    Rotational velocities of low-mass stars in the Hyades (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: High-resolution echelle spectra have been used to estimate rotational velocities for K and M dwarfs in the Hyades. All of the K dwarfs have rotational velocities less than the instrumental limit of 10 km/s. Most of the M dwarfs with (R - I)K larger than 1.0 have detectable rotational velocities, with v sin i between 10 and 20 km/s. Combining these data with results from the younger Pleiades and Alpha Persei clusters, it is found that G dwarfs spin down from about 100 km/s to about 10 km/s in less than 40 million yr, whereas M dwarfs take an order of magnitude longer to spin down.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 320; L51-L55
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  • 5
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    The rotational velocities of low-mass stars (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The rotational velocities of stars provide important clues to how stars form and evolve. Yet until recently, studies of stellar rotation were limited to stars more massive than the sun. This is beginning to change, and an observational outline of the rotational velocity evolution of stars less massive than the sun can now be provided. Low-mass stars rotate slowly during the early stages of premain-sequence evolution, and spin up as they contract to the main sequence. This spin-up culminates in a brief period of very rapid rotation at an age of order 50 million years. Physical interpretation of this increase in rotation and the subsequent main-sequence spin-down are complicated by the possibility of differential internal rotation. The observed rapidity of spin-down among G dwarfs suggests that initially only the outer convective envelopes of these stars are slowed. The data suggest an intrinsic spread in angular momentum among young stars of the same mass and age, a spread which is apparently minimized by the angular-momentum loss mechanism in old low-mass stars.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 98; 1233-125
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  • 6
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    Time variation of ocean temperatures and its relation to internal waves and oceanic heat flow measurements. (1966)
    In:  Other Sources
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    Publication Date: 2019-05-30
    Description: Time variation of ocean temperatures and relation to internal waves and oceanic heat flow measurements from four stations
    Keywords: GEOPHYSICS
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  • 7
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    Heat-flow measurements in the north atlantic, caribbean, and mediterranean. (1964)
    In:  Other Sources
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    Publication Date: 2019-05-24
    Description: Heat flow measurement in North Atlantic, Caribbean and Mediterranean with independent data comparison
    Keywords: GEOPHYSICS
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  • 8
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    Review of heat flow data. (1965)
    In:  Other Sources
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    Publication Date: 2019-05-24
    Description: Review and analysis of available data on heat flow through Earth crust
    Keywords: GEOPHYSICS
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  • 9
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    Heat flow in oceanic regions. (1969)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Heat flow through ocean floor by measuring temperature gradient and thermal conductivity in ocean sediment
    Keywords: GEOPHYSICS
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  • 10
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    Global analysis of seismic refraction measurements. (1966)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Seismic refraction measurements, computing statistics for depth to Moho, crustal thickness and upper mantle velocity for geographical and geological provinces
    Keywords: GEOPHYSICS
    Type: GEOPHYSICAL JOURNAL
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