Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..104....9f&link_type=abstract
Astronomy and Astrophysics Suppl. 104, 9-22 (1994)
Astronomy and Astrophysics
Astrophysics
6
Scientific paper
Four-colour and Hβ photometry is introduced for 594 stars earlier than G0 in the Kapteyn's Selected Area 194. The results give V, b-y, m_1_, c_1_, and β on the standard systems, with overall rms errors for one observation of one star of 0.009mag, 0.004mag, 0.006mag, 0.009mag, and 0.009mag, respectively. The data cover an area of about 5deg x 5deg and is intended for an investigation of the distribution of the interstellar medium toward the northern part of the Southern Coalsack and its surroundings. A comparison to earlier results obtained by other authors has shown that the c_1_ indices obtained for the late type stars were underestimated, in average, by 0.020mag. Since such difference may account for an error of little more than 10% in the estimated stellar distances, a correction was applied to the c_1_ index of these stars.
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