Coordinated optical and ultraviolet observations of DH Leo

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115539· OSTI ID:6439910

Newmark, J S; Buzasi, D L; Huenemoerder, D P; Ramsey, L W; Barden, S C ^[1]

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1. Pennsylvania State Univ., University Park (USA) Kitt Peak National Observatory, Tucson, AZ (USA)

Results are reported from contemporaneous KPNO optical spectroscopy, IUE UV spectroscopy, and KPNO R photometry of the DH Leo triple system in spring 1987. The data are presented in tables, graphs, and spectral phase images and discussed in detail. The H-alpha, H-beta, H-gamma, H-delta, and Ca II H and IRT lines are found to have excess emission, and the phase modulation in H-alpha, H-beta, and Ca II is well correlated with the photometric modulation. This result is attributed to the combination of (1) a small amount of global chromospheric emission and (2) emission from plagelike regions associated with cool starspots. The (H-alpha)/(H-beta) ratio is found to be significantly lower than that in longer-period RS CVn systems. 22 refs.

• OSTI ID: 6439910
• Journal Information: Astronomical Journal; (USA), Vol. 100; ISSN 0004-6256
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
BALMER LINES
EMISSION SPECTRA
GRAPHS
IMAGES
MORPHOLOGY
PHOTOMETRY
SPECTROSCOPY
STARSPOTS
TABLES
SPECTRA
STARS
STELLAR ACTIVITY
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources