Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097

Details Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097 Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238.1077k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 1077-1084. Research supported by

Astronomy and Astrophysics

Astronomy

40

A Stars, Metallicity, Stellar Oscillations, Variable Stars, Light Curve, Peculiar Stars, Stellar Rotation, Stellar Spectra

Scientific paper

HD 1097 is classified as A3/5mF0-F5 which makes it an extreme example of a classical Am star. The weakness of the Ca II K-line argues that it is an Am and not an Ap star. This paper presents the discovery of light variability in HD 1097 with a period of 81.17 + or - 0.05 min and a semiamplitude through a Johnson B filter of 4.52 + or - 0.16 mmag. For the T(eff) and presumed luminosity of HD 1097, this period is consistent with fundamental or first overtone pulsation. HD 1097 is thus both a classical Am star and a Delta Scuti variable. If diffusion is the correct explanation for the abundance anomalies in the Am stars, then there must be sufficient residual helium left in the He II ionization zone to drive small-amplitude pulsation. This pulsation must not generate turbulence with velocities greater than a very small fraction of a cm/s. The expected pulsation velocity at the surface of HD 1097 is a few hundred m/s.

Affiliated with

Also associated with

No associations

Rating

Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metallicism and pulsation - The discovery of Delta Scuti variability in a classical AM star, HD 1097 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1855910