The emission-line variable in the core of M 15

Details The emission-line variable in the core of M 15 The emission-line variable in the core of M 15

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85..269f&link_type=abstract

Astronomy and Astrophysics, vol. 85, no. 3, May 1980, p. 269-271.

Astronomy and Astrophysics

Astrophysics

3

Astronomical Photography, Cepheid Variables, Emission Spectra, Globular Clusters, Ubv Spectra, X Ray Sources, Light Curve, Stellar Magnitude, Stellar Spectra, Tables (Data)

Scientific paper

Photographic observations of the emission-line variable No. 86 in the core of the rich globular cluster M 15 (NGC 7078), which has been found to be within the error circle of the X-ray source 4U 2129+12, are reported. Two series of plates were taken in a determination of the U, B and V light curves, and estimates of stellar magnitude were obtained. Fourier analysis shows the variable to have a period of 16.829 days, with B and V light curves typical of a W Vir Cepheid variable. Observations also suggest the occurrence of a sudden outburst of about one magnitude in the course of a night; however, it is concluded that the star producing these suspected outbursts most likely is not related to the X-ray source. Further studies on low exposure plates are suggested to determine the nature of the X-ray source.

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