NSV 7457 Her: a new EW star with an unusual B-V light curve.

Details NSV 7457 Her: a new EW star with an unusual B-V light curve. NSV 7457 Her: a new EW star with an unusual B-V light curve.

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoce..21.....v&link_type=abstract

GEOS Circular on Eclipsing Binaries, No. EB 21, 8 p. (1993)

Physics

Scientific paper

NSV 7457 Her was catalogued in the New Catalogue of Suspected Variable Stars (1982) as an RR with a magnitude of 9.7 to 10.4 (p). Regular visual estimates and photoelectric measurements made by GEOS members allowed us to confirm the star's variability and to determine its ephemeris. It is probably an EW but the DSCT type cannot be dismissed with certainty. Its elements now agree with the following formula: JD hel 47,643.1786 (min) + 0.4190306 d*E. Its magnitude varies from 9,85 to 10.45 in V with a colour index B-V going from 0.618 to 0.684 in the Johnson system.

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