A Dwarf Cepheid in the Globular Cluster Omega-Centauri

Details A Dwarf Cepheid in the Globular Cluster Omega-Centauri A Dwarf Cepheid in the Globular Cluster Omega-Centauri

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..415n&link_type=abstract

Astronomy and Astrophysics, Vol. 98, P. 415, 1981

Astronomy and Astrophysics

Astrophysics

19

Scientific paper

A faint dwarf cepheid, NJL 220 (Niss, , and Laustsen, 1978) with = 16m.7, with a very short period, P = 0d.0463, has been found at a distance of 12' from the center of the globular cluster, Omega Centauri.
Using normal absolute magnitudes for dwarf cepheids, MV = 2m - 4m, the distance modulus of NJL 220, within the accuracy, is the same as that of the cluster, and the star might, therefore, be a cluster member. Under this assumption, the absolute magnitude of the dwarf cepheid is MV = 2m.9 ± 0m.3.
A mass of 2 ± 1 Msun is found, suggesting that mass has been transferred recently.

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