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  • 1
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    The relationship between carbon monoxide abundance and visual extinction in interstellar clouds (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Carbon monoxide column densities are compared to visual extinctions toward field stars in the rho Oph and Taurus molecular cloud complexes. The relationship of C(0-18) column density to extinction is established, and new determinations for (C-13)O column densities are given for a range of visual extinctions extended to beyond 20 mag. A prescription for determining hydrogen column densities and masses of molecular clouds from observations of CO isotopes is presented and discussed critically. These measurements agree well with the predictions of gas phase chemistry models which include chemical fractionation and selective isotopic photodestruction. The functional dependence of the C(O-18) column density on extinction is characterized by two different regimes separated by a distinct transition observed to occur at 4 mag in both molecular cloud complexes, whereas the functional dependence of (C-13)O is quite different in the two regions. Some saturation is found to occur for C(O-18) emission at high visual extinction and use the rarer isotopic species C(O-17) and (C-13)(O-18) to correct for it.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 262
    Format: text
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  • 2
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    The observations of the X-ray source HZ Herculis/Hercules X-1 (1980)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The results of a campaign of monitoring HZ Her with the IUE satellite are presented. The spectrum and light variation outside of eclipse are consistent with the Milgrom and Salpeter model for emission from the X-ray heated photosphere of the primary. Near eclipse there is UV flux in excess of the prediction of the heated photosphere model, which shows significant 35 day variations and is consistent with an origin in a precessing disk, as described by Gerend and Boynton. The spectrum shows the strong emission lines of N V and C IV, which generally vary in the sense of the continuum. The N V/C IV ratio is greater than 2 near orbital phase 0.5 and approaches unity near eclipse. It is suggested that these emission lines are optically thick and arise from both the heated photosphere and the accretion disk.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 237
    Format: text
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  • 3
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    The pulse profile of the Crab pulsar in the energy range 45 keV-1.2 MeV (1983)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: The Crab Nebula pulsar (PSR 0531+21) is the best studied and most intense of the nontransient X-ray pulsars. However, since its spectrum drops rapidly with energy, a well-resolved pulse profile has not previously been obtained above 200 keV. In the hard X-ray and low-energy gamma-ray region, an accurate pulse profile can be obtained with a balloon-borne detector of sufficient area during a single transit of the source. A new measurement of the pulse profile of PSR 0531+21 in the energy range above 45 keV obtained with a large-area scintillation detector array is reported. The detector array was flown on a balloon launched from Palestine, Texas on 1980 October 6, reaching a float altitude 4.5 g/sq cm at 0230 UTC October 7. The primary objective of the experiment was to detect and study weak gamma-ray bursts.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 1
    Format: text
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  • 4
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    U, B, V light curves of CO Lacertae (1983)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: CO Lacertae is one of the very few known binaries with both a short period of apsidal motion and good M, L, R data. The new U, B, V light curves presented here provide two times of minima and a check on Semeniuk's value for P(aps). This is the first published example of an eclipsing binary analyzed in terms of a physical model (as opposed to a model based on spherical or ellipsoidal star figures) which allows for eccentric orbit effects. The light curves show some peculiarities - particularly a large, probably intrinsic, scatter.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysics and Space Science (ISSN 0004-640X); 89; 1 Ja; Jan. 198
    Format: text
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  • 5
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    Progress on a quantitative model for Beta Lyrae (1981)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: It is shown that the opaque disk model for the Beta Lyrae secondary applies not only to B, V light curves, but also to the far ultraviolet, if allowance is made for the domination of the secondary's radiation by emission lines in the UV. The model also gives the correct phase and form of rotational eclipse disturbance (Rossiter effect), which is viewed here as a strong discriminator between opaque disk and semitransparent disk models.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomy and Astrophysics; 95; 2, Ma; Mar. 198
    Format: text
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