A revised ephemeris for the pulsating hydrogen-deficient star BD + 13 deg 3224 (V652 Her)

Details A revised ephemeris for the pulsating hydrogen-deficient star BD + 13 deg 3224 (V652 Her) A revised ephemeris for the pulsating hydrogen-deficient star BD + 13 deg 3224 (V652 Her)

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..673k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 1, 1984, p. 673-678. Research supported by th

Astronomy and Astrophysics

Astronomy

21

Ephemerides, Hot Stars, Stellar Evolution, Stellar Oscillations, Variable Stars, Binary Stars, Stellar Models

Scientific paper

Additional observations of maxima of the pulsating hydrogen-deficient star, BD +13°3224 (V652 Her), give an improved ephemeris for the decreasing period of pulsation. A simple quadratic no longer appears sufficient and a cubic solution may be preferable, indicating that the pulsation decrease rate is slowing down as the star contracts. An alternative hypothesis, that the star is a binary is also discussed.

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