Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541719s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #417.19; Bulletin of the American Astronomical Society, Vol. 42, p.274
Other
Scientific paper
This study includes the analysis of photometric and spectroscopic observations of the delta Scuti variables V873 Herculus and V2455 Cygni, along with spectroscopic observations of delta Scuti. Using the methods of Crawford (1958), we found H-beta indices for these stars and plotted them versus time. These spectroscopic time-series were then compared to the photometric data and published periods. We first used delta Scuti (V = 4.71) as a bright test star to find if this method would indeed give us the desired variability. After this confirmation, we moved to the dimmer stars V873 Her (V = 8.40) and V2455 Cyg (V = 8.53).
V873 Herculis was discovered to be variable by Aluigi et. al. (1994) who provided two close periods of 7.91 cycles/day and 7.77 cycles/day. Our preliminary photometric observations of the star refined the period to 7.863608 cycles/day. We have extended the baseline of those observations to include another 18 nights of photometric data that include 10 new times of maximum light in the 2009 season as well as 6 nights of medium-dispersion spectroscopic data taken at the Dominion Astrophysical Observatory 1.22-m telescope. From this data, we present a refined period, the possible presence of an orbital companion, and a spectroscopic time-series that shows the change in temperature over time.
V2455 Cygni was first suspected of variability by Yoss et. al. (1991) and further observations done by Piquard (2001) and Wils et. al. (2001) confirms its classification as a High Amplitude delta Scuti variable with a period of 10.615035 cycles/day. We have extended the baseline of the photometric observation to include another 7 nights of data that include 9 new times of maximum light as well as 4 nights of spectroscopic data. Using these, we present a refined period as well as a spectroscopic time-series of the star.
Hintz Eric G.
Joner Michael D.
Schoonmaker Jeremy
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