J/A+AS/104/9 J/A+AS/104/9 uvby-beta photometry of all stars earlier than G0 G A P Franco Astron. Astrophys. Suppl. Ser. 104 9 1994 1994A&AS..104....9F dust, extinction ISM: clouds ISM: individual (Southern Coalsack) surveys Four-colour and H{beta} 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 {beta} 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.

Name Star identification in the Potsdam-Spektral Durchmusterung of the Kapteyn's SA 194 --- HD HD number --- MK Michigan two dimensional classification number=1 Houk N. & Cowley A.P. 1975, Univeresity of Michigan Catalogue of Two-Dimensional Spectrl Types for HD Stars, Univ. of Michigan, Ann Arbor, Vol.1 --- RAh Right Ascension 1900.0 h RAm Right Ascension 1900.0 min RAs Right Ascension 1900.0 s DE- Declination sign --- DEd Declination 1900.0 deg DEm Declination 1900.0 arcmin V computed V magnitude on the Johnson system mag e_V mean error of V 0.001mag n_V When *, the star is probably variable --- (b-y) (b-y) colour index mag e_(b-y) mean error of (b-y) 0.001mag m1 colour indices difference m1 mag e_m1 mean error of m1 0.001mag c1 colour indices difference c1 mag e_c1 mean error of c1 0.001mag o_ubvy Number of observations in uvby --- Hbeta Hbeta index mag e_Hbeta mean error of Hbeta 0.001mag o_Hbeta Number of observations in Hbeta --- Patricia Bauer CDS 1994Mar21 J_A+AS_104_9.xml