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The Wolf 630 moving group of stars
An analysis is made of the probability of collective membership of thestars assigned by Eggen to the Wolf 630 moving group. This probabilityis estimated from the scatter of points in the color-absolute magnitudediagram when compared to the intrinsic scatter observed for M67.Particular attention is paid to the random errors for all the observedand deduced stellar parameters. Results show that either theobservational errors must be about 2.4 times larger than given in theproper motion and radial velocity source catalogues, or the intrinsicscatter in the color-magnitude diagram for the Wolf 630 group must bemuch larger than for M67, or many of the stars considered cannot bemembers.
| Intermediate-band photometry of late-type stars. V - Calibration of indices
Additional data for several stellar groups and clusters are used toimprove a previously determined provisional relation betweenM1 photometric index and the parameter /Fe/H/(solar) as wellas to test the usefulness of the C1 photometric index forluminosity determinations. The data are for 43 members of the Wolf 630group, 14 members of the 61 Cygni group, 30 members of the Arcturusgroup, 14 members of Kapteyn's star groups, and various members of theHyades, 47 Tuc, NGC2420, Omega Cen, and an anonymous group of subdwarfs.It is found that in general the values of C1 only confirm agiant or dwarf classification without yielding accurate luminosities andthat the main contribution of C1 for disk objects is inisolating peculiar stars. The results also indicate that there is aluminosity effect in M1 for the strongest-lined stars andthat the values of M1 become distorted, probably by thepresence of TiO, for R-I larger than about +0.5 magnitude. An array forinterpolating /FE/H/(solar) from (R-I, M1) is constructed byadopting mean values of /Fe/H/(solar) equal to +0.1,-0.35, -0.6, and-1.8 for the Hyades, Wolf 630, Arcturus, and Kapteyn's star groups,respectively.
| Stellar Groups in the Old Disk Population
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| A Finding List of Early-Type Stars in Regions of Intermediate Galactic Latitude
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1969ApJ...157..327U&db_key=AST
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