E. F. Guinan, G. McCook, and S. Margheim, Villanova University, write: "UBVRI photoelectric photometry of the final helium-flash candidate V4334 Sgr (cf. IAUC 6322, 6323, 6325, 6328) has been conducted with the Four College Consortium 0.8-m APT in Arizona over 23 nights during June and July. The photometry reveals low- amplitude (0.07 mag in V) semi-periodic light variations having a characteristic timescale of about 22 +/- 3 days. Smaller-amplitude (0.02 mag in V) light variations also are present with timescales of 6-10 days. Light variations like these are commonplace for many post-AGB stars and most likely arise from pulsations. The mean magnitude during this interval was V about 11.1, similar to the brightness that the star has maintained since its rapid brightening."
International Astronomical Union Circular
- Pub Date:
- August 1997