Back to Search
Start Over
The EC 14026 stars -- X. A multi-site campaign on the sdBV star PG 1605+072
- Source :
- Scopus-Elsevier
- Publication Year :
- 1999
- Publisher :
- Oxford University Press (OUP), 1999.
-
Abstract
- 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.
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 303
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....54c47e4e53f5f67ef111aece01d72c64