Time-resolved spectroscopy and photometry of the eclipsing AM Herculis binary EXO 033319 - 2554. 2

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168130· OSTI ID:7194025

Allen, R G; Berriman, G; Smith, P S; Schmidt, G D ^[1]

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1. Steward Observatory, Tucson, AZ (USA)

Time-resolved optical observations of the eclipsing AM Herculis binary EXO 033319 - 2554.2 are presented. High-speed photometry of an eclipse is presented and used to derive a new ephemeris for the system and to estimate the size of the region responsible for the cyclotron emission. Optical spectra that span the orbital cycle are presented, the cyclotron emission in these spectra is discussed, and the flux and radial velocity variations of H-beta, H-gamma, and He II 4686 A are examined. Models of the flux and radial velocity variations of the emission lines indicate that about half the line emission comes from low-velocity material that is about 1.4 x 10 to the 10th cm from the white dwarf. The rest comes from high-velocity material that is about 10 to the 10th cm from the white dwarf and is moving toward it at about 600 km/s. 13 refs.

• OSTI ID: 7194025
• Journal Information: Astrophysical Journal; (USA), Vol. 347; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
PHOTOMETRY
SPECTROSCOPY
ACCRETION DISKS
BALMER LINES
CYCLOTRON RADIATION
ECLIPSE
EMISSION SPECTRA
LINE WIDTHS
MAGNETIC FIELDS
MAGNETIC STARS
RADIAL VELOCITY
SIZE
SPECTROPHOTOMETRY
VARIATIONS
VISIBLE SPECTRA
WHITE DWARF STARS
BREMSSTRAHLUNG
DWARF STARS
ELECTROMAGNETIC RADIATION
RADIATIONS
SPECTRA
STARS
VELOCITY
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources