Pulsating Red Stars



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Pulsating Red Stars

Photoelectric photometry of the M-supergiants, Ori and Her continue. Ori has been monitored at Villanova by Guinan and astronomy students since 1981. Analysis of this unique data set is being made by Guinan and research associate David Steelman. The star shows light variations on various timescales. The longest is the 4.2 yr period reported last year. Starting in mid-Oct 1994, Ori showed a relatively rapid decline in brightness of about 0.5 mag, which bottomed out early April 1995. By Sept. 1995, the star had returned to near its original brightness. It appears that the star once had a photometric period near 400 days. The light variability of Her is being monitored with the 0.8m APT, and shows a 60-80 day periodicity; this star also may have a longer period of the order of several years. This photometric work is part of a coordinated effort of FUV spectroscopy and ground-based radial velocity observations being made by A. Dupree(CfA) and M. Smith (CSC).



Astronomy
Mon Feb 26 18:11:01 EST 1996