GRANULATION IN THE PHOTOSPHERE OF {zeta} CYGNI

Journal Article · Tue May 15 00:00:00 EDT 2012 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/143/5/112· OSTI ID:22034649

Gray, David F., E-mail: [e-mail] ^[1]

---

1. Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7 (Canada)

A series of 35 high-resolution spectra are used to measure the third-signature plot of the G8 III star, {zeta} Cygni, which shows convective velocities only 8% larger than the Sun. Bisector mapping yields a flux deficit, a measure of granulation contrast, typical of other giants. The observations also give radial velocities with errors {approx}30 m s{sup -1} and allow the orbit to be refined. Velocity excursions relative to the smooth orbital motion, possibly from the granulation, have values exceeding 200 m s{sup -1}. Temperature variations were looked for using line-depth ratios, but none were found.

• OSTI ID: 22034649
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 143, Issue 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
CONVECTION
EMISSION SPECTRA
GRANULATION
MAIN SEQUENCE STARS
MAPPING
MILKY WAY
ORBITS
PHOTOSPHERE
RADIAL VELOCITY
RESOLUTION
VARIATIONS