Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.3504h&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #35.04; Bulletin of the American Astronomical Society, Vol. 27, p.859
Other
Scientific paper
We present Goddard High Resolution Spectrograph (GHRS) observations of intermediately and highly ionized gas toward the O7.5 star xi Persei. Our 3.5 km s(-1) resolution GHRS absorption line observations cover the resonance lines Si iv lambda lambda 1393,1402; C iv lambda lambda 1548,1550; N v lambda lambda 1238,1242; Al iii lambda 1862; and S iii lambda 1190. Copernicus Satellite observations of O vi lambda 1031 absorption toward this star are also examined to aid our interpretation of the ionized species observed with the GHRS. The Al iii and S iii profiles exhibit a complex behavior, but can be adequately described by two components. One occurs at velocities where high ion absorption is present, while the other appears distinct from high ion observations and may couple to the neutral gas seen toward the star. The absorption profiles of Si iv and C iv can also be explained by a two component model. A narrow, photoionized component occurs at the same velocity as Hα emission detected through Fabry-Perot observations of the star and traces 10(4) K gas. A second, broader component resembles the O vi profile and maps out a hotter, collisionally ionized gas. We discuss possible locations for the generation of this second component, including the Local Bubble, collisionally ionized cloud interfaces, and the bow shock around the star. IRAS images near the star show bright, extended emission at the location of xi Per and may result from the interaction of the powerful stellar wind (v_infty ~ 2600 km s(-1) ; dot {M}_sun ~ 3 times 10(-7) km s(-1) ) and runaway stellar velocity ( ~ 70 km s(-1) ) with the surrounding ISM. In such a dynamic environment, these UV observations toward xi Per provide an excellent probe of this energetic star interacting with its local environment.
Haffner Matthew L.
Savage Blair. D.
Sembach Kenneth Russell
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