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Spectral analysis of the radial velocities of the stars confirms that S Normae is indeed a member of the cluster. The distance to the cluster can be accurately measured using the period-luminosity relationship of Cepheid variable stars.{{Citation-needed}} | Spectral analysis of the radial velocities of the stars confirms that S Normae is indeed a member of the cluster. The distance to the cluster can be accurately measured using the period-luminosity relationship of Cepheid variable stars.{{Citation-needed}} | ||
== | ==References== | ||
* [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6087 "NGC 6087"] | * [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6087 "NGC 6087"] | ||
* [https://doi.org/10.1086%2F190092 "The Galactic Cluster NGC 6087"] | * [https://doi.org/10.1086%2F190092 "The Galactic Cluster NGC 6087"] | ||