Velocity Structure in the Chromosphere and Wind of VV Cephei

Details Velocity Structure in the Chromosphere and Wind of VV Cephei Velocity Structure in the Chromosphere and Wind of VV Cephei

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910106b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #101.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

VV Cephei is an eclipsing binary system composed of an M2Iab supergiant primary with an extended atmosphere and wind and a hot companion, probably an early B main-sequence star. This hot companion provides an astrophysical light source whose orbital motion can be used to probe the structure of the M supergiant atmosphere.
The system was observed with the STIS spectrograph at 21 epochs between 1997 and 2003, which extended from total eclipse through and just beyond first quadrature. Some absorption features, generally due to neutral elements or singly ionized ions of low ionization potential, weaken and disappear during the “chromospheric eclipse” phase. Many of these chromospheric lines appear doubled, especially in the early phases of chromospheric eclipse. Other absorption features, generally due to low-lying levels of singly ionized atoms arise in the wind of the M supergiant, and persist throughout the cycle.
We present radial velocity measurements for these absorption features as measured from the STIS observations. The wind features have a nearly constant radial velocity, -20 km sec-1 relative to the systemic velocity. The trend of the chromospheric features’ radial velocities tracks the orbital motion of the M supergiant.
This work was based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-7269, and were supported by NASA through a grant from the Space Telescope Science Institute.

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