Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...46..355b&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 46, Dec. 1981, p. 355-364. Research supported by the Swiss National Science
Astronomy and Astrophysics
Astrophysics
3
Galactic Structure, Interstellar Extinction, Milky Way Galaxy, Space Density, Star Distribution, Giant Stars, Main Sequence Stars, Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
Perseus I, a star field near h and χ Persei, measuring 0.155 square degrees and containing 1281 stars down to the limiting magnitude G = 18m.5 has been studied photometrically in the RGU-system. The two-colour-diagram of all stars with G < 18m is given in figure 2. The evaluation of the two-colour-diagrams for consecutive intervals in G leads to an interstellar reddening produced by two screens in distances of 0.6 kpc and 1.5 kpc from the sun, with a total reddening of E(G-R) = 0m.88 (Fig. 4). The density-functions have been determined for different intervals of absolute magnitude (Figs. 6, 7 and 8). There is a rather large number of late-type giants at the left side of the main-sequence. In addition to them, with G > 18m, further late-type giants are found at the right side of the main-sequence (Fig. 3e) which are possibly metal-poor. The luminosity-functions have been determined for two adjoining distance-intervals (Fig. 9).
Becker Walter
Wooden H. II W.
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