ER Vulpeculae
Abstract
D. H. Bradstreet and E. F. Guinan write: "The highly chromospherically-active, detached eclipsing binary ER Vul (G1 V+G2 V; P = 0.7 day) is scheduled to be observed continuously with the IUE satellite during Sept. 26-28. ER Vul is an important binary because the physical characteristics of the stars (mass, temperature and radius) are nearly identical to the those of the sun, except that the stars rotate nearly 40 times faster and have extremely high levels of chromospheric and coronal activity. We are proposing an intensive, worldwide campaign to conduct a multifrequency study of this important binary. Simultaneous photometry, spectroscopy, polarimetry and radio observations will be crucial in establishing the sites of active regions and starspots on the stars and to determine the nature of frequent flarelike events seen in its visible-band lightcurves. For those interested in photoelectric photometry, the suggested comparison and check stars are SAO 89378 and SAO 89413, respectively. For more information please contact us at Villanova University (telephone 215-645-4823, telefax 215-645-7889, e-mail GUINAN@VUVAXCOM)."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- August 1991
- Bibcode:
- 1991IAUC.5329....1B