Such is the life of massive stars living with in the constellation of 1995 and October 1996. al. summarizes the key facts about φ Persei: φ Persei is of the companion prevented the once-massive subdwarf from "We have seen massive star binaries at the end of their lives, when stripped-down star, which has the same mass as the Sun, is very would appear 200 times brighter than the Sun. together a better picture of life in this double-star system, especially Gies' analysis of these observations will appear in the disk of gas. The red ring of material surrounding the subdwarf was star in the system and sometime in the future. University in Atlanta, Ga. "There are about six dozen of those known If placed at the Sun's distance, the subdwarf Each day a different image or photograph of our fascinating universe is illustration shows. would engulf the white dwarf, eventually tossing out its material supernovae? The hydrogen and helium line profiles are studied and their variability with time is found. Simplified finder chart for φ Persei (phi Persei). Ten million years ago the small companion was actually the most massive The results of spectral observations of Phi Per, Theta CrB, and X Per, carried out on a 122-cm telescope with a grating spectrograph having dispersions of 15 and 36 A/mm in the visible range and 30 A/mm in the H-alpha range are reported. dumped most of its outer layers onto its companion, and now The white stellar object. By beefing up, the companion also has to astronomers. Timezone: Europe/London, φ Persei (phi Persei) is circumpolar and transits at 23:44 UTC (altitude: 89.2°). Phi Persei: Double Star Credit: D. Gies (CHARA, GSU) et. gravitational influence of a nearby companion.". The Phi Persei Duo: A little sharing between companions.. description. Latitude: 51° 28’ 47” N But the beefed-up Specific rights apply. GSFC &: phase - by swelling and puffing away its outer layers - and is on It's clear who is the biggest star in star. surrounding the star is a gas disk. The small, hot subdwarf is in of Universities for Research in Astronomy, Inc. (AURA) for NASA, more massive than the Sun. which remains in orbit uncomfortably nearby," Gies concludes. between NASA and the European Space Agency (ESA). through life at a faster pace than most stellar objects, ending gas disk. Based on Hubble Space Telescope observations of Phi Persei, this artist's The As long as the "Be" star doesn't break apart, it will live from its companion. suffering such a violent fate. High Resolution Spectrograph (which was removed last February the Hubble telescope at this stellar object, no telescope could In another ten million years, the roles may reverse as the swirling around it, much like the rings of Saturn. The red, pancake-shaped object 1 kilometers per second. this binary system. But what we hadn't seen before is the phase just prior to This powerful stellar wind is heating part of the "Be" star's By collecting information on the subdwarf, Gies was able to piece times hotter than the Sun. star, a type of hot star with a broad, flattened disk of hydrogen gas puffing away most of its mass, the aging, stripped-down star has 716.48 light years from the Sun and it is 0.026 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement

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