Yellow giants in young clusters. I: photometric observations

• Published in: The Astrophysical journal. Supplement series 1984-07, Vol.55 (3), p.455-463
• Main Author: SCHMIDT, E. G
• Format: Article
• Language: English
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; Giant and subgiant stars; Normal stars (by class): general or individual; Stars
• ISSN: 0067-0049; 1538-4365
• DOI: 10.1086/190962

To enable a study of the properties of luminous yellow stars, a list has been compiled of 84 stars which appear to be in the appropriate region in the color-magnitude diagrams of 41 young clusters. Proper motions, radial velocities, UBV photometry, and spectral types from the literature have been used in those cases where such data are available to assign membership probabilities. DDO and uvby photometry have also been obtained of most of the stars in the list, and these data are analyzed to remove stars from the sample which have the wrong luminosity or the wrong color excess for cluster membership. In addition, VRI photometry is given for many of the stars in the list. Based on these data, 22 of the stars (26 percent) from the original sample are likely cluster members, while 48 (57 percent) are not likely to be members. The remainder must be studied further to determine their status, but it is probable that some of them are also in clusters.