Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Distance estimate of M31 based on the size distribution of Hii regions and dark clouds (1985)
    Springer
    Astrophysics and space science 113 (1985), S. 317-323 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The size distribution of dark clouds and of H II regions were used to derive a distance of 440±22 kpc for M31. Some galactic H II regions and dark clouds were combined with the same ingredients in M31 to study the mass spectrum of both phenomena. A gas to dust ratio of 1000∶1 has been derived for M31. Radii of the classical H II regions as derived in this work using distance of 440 kpc agrees with the galactic classical H II region radii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650966
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Surface distribution of dark clouds in M31 absorption gradient along the major axis, I (1991)
    Springer
    Astrophysics and space science 176 (1991), S. 123-130 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of dust clouds in M31 was studied based on a photocopy of this galaxy taken from Hubble'sAtlas. The picture was divided into strips starting from the center of the galaxy on both sides along the major and the minor axis, respectively. The number of dark clouds per square kiloparsec was estimated as a function of the distance from the center of the galaxy along the major axis. If we assume the validity of the standard cloud model in M31, the filling factor introduced by the model was found to vary with distance from the center. It was found furthermore, that the filling factor introduced by the model may be an upper limit. The counts of dark clouds indicate a periodical change in the absorption gradient along the major axis with a very slight systematic variation assumed by the exponential part of the representation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643082
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Surface distribution of dark clouds in M31 absorption gradient along the minor axis and in theR andθ directions, II (1991)
    Springer
    Astrophysics and space science 176 (1991), S. 275-282 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absorption and absorption gradient is studied along the minor axis of M31 and as a function of the angle measured from the minor axis with the center of the galaxy as origin. The radial distribution of these phenomena is studied also. The counts of dark clouds averaged over all in each case assumes periodical changes. In some cases systematic changes are shown also. The fraction of the volume occupied by these clouds is smaller by an order than that introduced by the standard cloud model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646702
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Absorption gradient in galaxies, V (1992)
    Springer
    Astrophysics and space science 190 (1992), S. 57-66 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The same procedure mentioned in Papers I, II, III for studying the surface distribution of dark clouds is used to study the same phenomenon in the galaxies NGC 253, NGC 2841, NGC 5321, NGC 5194, and NGC 5195 radially and angularly. The general form (sinusoidal distribution function) found earlier is still representative for the present results. Internal absorption was found to vary along these two variables (radially and angularly) in the same way as was found earlier for M31 (the papers cited at the end) which may lead to the assumption of universality of this phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644566
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Detailed isophotometry of some galaxies, I (1992)
    Springer
    Astrophysics and space science 190 (1992), S. 67-88 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results from a detailed isophotometric survey of NGC 5595, NGC 5597, NGC 5605, and NGC 7769 are given. It includes isophotic maps, luminosity profiles and ellipticity curves as well. Scanning of these galaxies was done in theB andV colours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644567
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Detailed surface photometry of some galaxies integrated properties, II (1992)
    Springer
    Astrophysics and space science 190 (1992), S. 89-117 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results about the standard photometric parameters of four galaxies are given. The equivalent and the integrated parameters defined according to de Vaucouleurs are listed. Effective values of the abovementioned ingredients, the reduced luminosity profiles and the dimensions defined by the quartiles are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644568
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Astronomical research activities with the 74 inch telescope at Kottamia observatory (1986)
    Springer
    Astrophysics and space science 118 (1986), S. 87-93 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two topics of research, namely extragalactic and variable star studies represent the main attitudes of astronomical work at the Helwan Observatory. The 74 inch telescope at Kottamia (476 m, 2h.12, 29°.93 N) some 60 km to the east of Cairo is the main instrument. Some other auxiliary equipment (Cassegrain and echelle spectrographs, Westinghouse and Japanese cameras and photoelectric photometer) can be attached at both Cassegrain and Newtonian foci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Distance estimation of the LMC, SMC, and M33 from the apparent radius distribution ofHii-regions (1986)
    Springer
    Astrophysics and space science 125 (1986), S. 43-48 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The size distribution ofHii-regions in the LMC, SMC, and M33 is used to estimate their distances. The values deduced are: 42.66±2.51, 89.73±5.03, and 755.11±47.14 kpc, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643970
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Archimedes spiral and the surface distribution of dark clouds in M31, III (1991)
    Springer
    Astrophysics and space science 184 (1991), S. 227-234 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface distribution of dark clouds along the major and minor axes were compiled to give a general formula expressing the surface distribution along both axes simultaneously. Absorption values were determined, assuming the parameters of the standard cloud model as a function of the distance from the two-dimensional distribution of dark clouds. Iso-cloud line numbers were drawn as a function of bothX andY. Two knots appeared in the new distribution function. This may announce the beign of the spiral arms. The knots may indicate the least possible number of the dark clouds per kiloparsec beyond which spiral structure may be possible. The projected distance of the two knots on the X-axis may correspond to some spiral features found by other investigators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642971
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Absorption gradient in some galaxies, IV (1992)
    Springer
    Astrophysics and space science 189 (1992), S. 123-133 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The internal absorption and the absorption gradient along the major and minor axes are studied, following the approach outlined already in Papers I, II, and III. The sample consists of five spirals and one irregular. The surface distribution of dark clouds in these galaxies continues to assume periodicity as found in M31.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642958
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...