The discovery of singly-periodic, low-amplitude Delta Scuti oscillations in the marginal AM star HR 3321

Details The discovery of singly-periodic, low-amplitude Delta Scuti oscillations in the marginal AM star HR 3321 The discovery of singly-periodic, low-amplitude Delta Scuti oscillations in the marginal AM star HR 3321

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..253k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 253-260.

Astronomy and Astrophysics

Astronomy

20

A Stars, Light Curve, M Stars, Periodic Variations, Stellar Oscillations, Abundance, Frequency Distribution, Stellar Spectra

Scientific paper

HR 3321, which is classified Am 5:, is announced to be a δ Scuti star. This is only the third marginal Am star which has been found to pulsate. A frequency analysis of 10 hr of observations obtained on three nights indicates that the star is singly-periodic with a period of 54.71±0.01 min and a semi-amplitude in Johnson B of 2.9±0.1 mmag. This star is also interesting for the reason that very few amplitude δ Scuti stars are known which are singly-periodic.

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