High-dispersion H alpha spectroscopy of epsilon Aurigae

Details High-dispersion H alpha spectroscopy of epsilon Aurigae High-dispersion H alpha spectroscopy of epsilon Aurigae

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..874c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 3, p. 874-882

Astronomy and Astrophysics

Astrophysics

5

Astronomical Spectroscopy, Eclipses, Eclipsing Binary Stars, F Stars, H Alpha Line, Supergiant Stars, Auriga Constellation, Charge Coupled Devices, H Ii Regions, High Dispersion Spectrographs, Line Shape, Stellar Envelopes, Telescopes

Scientific paper

H alpha spectroscopic observations have been made by using a high-dispersion and high-resolution thick CCD system, when the orbital phase of epsilon Aur was near 0.3. During two years of out-of-eclipse observations, the H alpha profile varied significantly. The circumstellar gas circling the F0 superginat is possibly a ring-like H II structure, which consists of moving gaseous clouds. H alpha profile variation outside eclipse may be due to the apparent motion of gaseous clouds within the ring following the rotation of the primary, and to its intrinsic physical changes.

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