Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...37..529c&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 37, Sept. 1979, p. 529-539. In French.
Astronomy and Astrophysics
Astrophysics
2
Galactic Rotation, Spectrophotometry, Astronomical Photography, Astronomical Spectroscopy, Luminosity, Mass Ratios, Tables (Data)
Scientific paper
An optical study of the Sc galaxy NGC 2776 is described. Blue and red photographs show a nucleus surrounded by two principal far-stretching spiral arms. Image tube spectra (in the range 6450-6800 A) lead to a symmetrical rotation curve. A mass of 7.3 x 10 to the 10th solar masses (out to a distance of 65 arcmin) and a mass-luminosity ratio of 3.8 were determined assuming a distance of 28.4 Mpc. The photometric study showed an increase of H-alpha/N II forbidden line ratio across the arms and indicated a moderate value of excitation for the galaxy as a whole, making it an early type Sc.
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