Abstract

The authors have obtained precise radial-velocity measurements of 39 stars and 170 stars in the fields of the open clusters M11 and M67, respectively; by selection, the vast majority of the stars observed are cluster members. All stars observed are of spectral type later than F5; the data set includes essentially all of the giants in both clusters and all main-sequence stars in M67 brighter than V = 12.8, plus an assortment of nonmembers and fainter members. Single-measurement precisions range from 0.3 to 0.8 km s<SUP>-1</SUP>. Almost all stars have been observed repeatedly, with cluster members typically having 5 - 25 velocity measurements. Observations were obtained over a span of 16 yr, although not all stars were observed throughout that period. The time distribution of the observations is a combination of low-frequency coverage (&lt;1 yr<SUP>-1</SUP>) over the first 11 yr and higher-frequency coverage (&gt;2 yr<SUP>-1</SUP>) over the final 5 yr.

Keywords

PhysicsOpen clusterRadial velocityAstrophysicsStarsBlue stragglerAstronomyStar cluster

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Publication Info

Year
1986
Type
article
Volume
92
Pages
1100-1100
Citations
82
Access
Closed

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Robert D. Mathieu, David W. Latham, R. F. Griffin et al. (1986). Precise radial velocities of late-type stars in the open clusters M11 and M67. The Astronomical Journal , 92 , 1100-1100. https://doi.org/10.1086/114240

Identifiers

DOI
10.1086/114240