Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303..525k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 3, pp. 525-534.
Other
75
Stars: Individual: Pg 1605+072, Stars: Oscillations, Stars: Variables: Other
Scientific paper
Results are reported from a multi-site photometric campaign on PG 1605+072, a member of the recently discovered class of pulsating hot subdwarfs, or EC 14026 stars. The main part of the campaign covered two weeks and produced ~ 180 h of photoelectric photometry from the five sites involved. Periodogram analysis shows that the light curve is dominated by five frequencies in the range 1.89-2.74 mHz (periods 529-365 s) with the main frequency at 2.075 76 mHz (481.75 s), though there appear to be more than 50 frequencies identifiable down to a semi-amplitude of 0.0007 (in fractional intensity) in the range 1.74-4.84 mHz (573-206 s). Compared with other pulsating sdB stars, the low gravity (log g= 5.25) and long periods indicate that the star has evolved away from the core helium-burning horizontal branch. A preliminary model of a post-horizontal-branch star with appropriate parameters yields many pulsation periods in the range 300-600 s, but detailed mode identification is not possible at present.
Burleigh Matthew R.
Dobbie Paul D.
Kawaler Stephen D.
Kilkenny Dave
Koen Chris
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