Lynga 7

RA:

16:11:03.0

Dec:

-55:18:52

Distance from Sun:

23.5 kly

Distance from Galactic Center:

13.7 kly

Apparent Diameter:

arc min

Brightness:

mag vis

Radial Velocity:

Diameter:

Abs. Mag:

Globular cluster Lynga 7 was first cataloged by G. Lynga (1964) as open cluster and classified as of Trumpler type II 2 p. It is listed again as open cluster by van den Bergh-Hagen (1975) as vdB-Ha 184.

It was only in 1993 that Ortolani, Bica and Barbuy brought up evidence that this object might be a globular cluster. They investigated its color-magnitude diagram, which resembles that of a globular, but derive a significantly lower age than for the usual globular clusters, and classify it as a disk globular cluster. Similar results were obtained by Tavarez and Friel (1995). Meanwhile, Lynga 7 is generally regarded as globular.

Lynga 7 is one of the more "metal-rich" globulars, i.e. its stars contain significantly higher concentrations of elements heavier than Helium than average globulars, more similar to the composition of our Sun.

The image in this page in an IR photograph obtained within the Two Micron All Sky Survey (2MASS) and taken from the 2MASS atlas. Colors represent different IR bands: J band (1.2 micron) is represented blue, H (1.6 micron) green, and Ks light (2.2 micron) red.

References:

• G. Lynga, 1964. Studies of the Milky Way from Centaurus to Norma. II. Open clusters. Lund Medd. Astron. Obs. Ser. II, No. 140. Table III: 14 suspected new [open] clusters.
• S. Ortolani, E. Bica and B. Barbuy, 1993. Lynga 7 : a new disk globular cluster ? Astron. Astrophys., 273, 415-420 (06/1993)
• Maritza Tavarez and Eileen D. Friel, 1995. Lynga 7: Old Open Cluster or Globular Cluster? Astronomical Journal, Vol. 110, p. 223-227 (07/1995)
• Sidney van den Bergh and Gretchen L. Hagen, 1975. Uniform survey of clusters in the Southern Milky Way. Astronomical Journal, Vol. 80, p. 11-16 (01/1975)