Fourier coefficients of OGLE variables. III. δ scuti stars
Fourier coefficients for δ Scuti from the OGLE dark matter survey of the Galactic bulge are compared to the coefficients of similar stars, mainly High Amplitude δ Scuti and SX Phe stars. While in previous studies there appears to be a division amongst the δ Scuti stars based upon the R21 parameter, such a division is not apparent in the OGLE stars. There does though appear to be a separation of the δ Scuti stars based upon the Φ31 variable. This separation is not likely due to a metal variation and its cause is not known. Values for the extinction towards the Galactic bulge can be used to estimate a distance of approximately 7.6 kpc for the δ Scuti stars. One variable does appear to be located beyond the Galactic bulge at a distance of approximately 21 kpc.
Original Publication Date
Morgan, Siobahn M.; Simet, Melanie; and Bargenquast, Stephanie, "Fourier coefficients of OGLE variables. III. δ scuti stars" (1998). Faculty Publications. 3849.