Coordinated optical and ultraviolet observations of DH Leo

Journal Article · Wed Aug 01 04:00:00 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), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

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