1995PASP..107...27J -
Publ. Astron. Soc. Pac., 107, 27-31 (1995/January-0)
The Gronbech-Olsen photometry: transformations to a Hyades-Coma system.
JONER M.D., TAYLOR B.J., POWELL J.M. and JOHNSON S.B.
Abstract (from CDS):
In this paper, we consider the zero points of six sets of Stromgren-beta photometry. The color-index system to which our results are referred is a "Hyades-Coma" system composed of photometry by Crawford and Perry (
1966AJ.....71..206C) and Barnes (
1969AJ.....74..407C). For V magnitudes, we use measurements by Taylor and Joner (
1992PASP..104..911T). Our results are as follows: (1) The zero points of photometry by Gronbech and Olsen (
1976A&AS...25..213G;
1977A&AS...27..443G) are offset from those of the Hyades-Coma system. The offsets can amount to several mmag; they appear for V and all color indices except beta, and depend on right ascension and (usually) declination. (2) These offsets can be applied to photometry by Stetson (
1991AJ....102..589S), who reduced his results to the Gronbech-Olsen system. After correction, Stetson's results for a set of "transfer stars" differ from comparable data published by Crawford and Barnes (
1970AJ.....75..978C). (3) A direct comparison of the transfer stars to the Hyades yields consistency between the Hyades-Coma and Crawford-Barnes zero points (for the transfer stars specifically). This result supports a conclusion drawn by Taylor and Joner, and suggests that there is some problem with the zero points of Stetson's transfer-star data. (4) From Stetson's corrected data, one finds that the Crawford-Perry zero points for the Hyades are consistent with the Crawford-Barnes zero points for Coma. This result agrees with a conclusion drawn by Taylor and Joner from their own data, and suggests that the problem postulated for Stetson's transfer-star data does not extend to his results for the Hyades and Coma.
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