horizontal branch


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horizontal branch

A horizontal strip on the Hertzsprung–Russell diagram of a globular cluster, to the left of the red-giant branch. It consists of low-mass stars that have lost mass during the red-giant phase; they all have absolute magnitudes of about the same value. Where the instability strip associated with pulsating variables crosses the horizontal branch, the stars are RR Lyrae stars; in a conventional H-R diagram of nonvariable stars, this appears as a gap in the horizontal branch.

horizontal branch

[‚här·ə′zänt·əl ′branch]
(astronomy)
A region in the Hertzsprung-Russell diagram of a typical globular cluster that extends in the blue direction from the giant branch at an absolute bolometric magnitude of 0.3 and consists of stars that are burning helium in their cores and hydrogen in their surrounding envelopes.

horizontal branch

horizontal branch
A branch drain with a horizontal extension from a waste, soil, or vent stack, or from a building drain, which receives the discharge from a single fixture or a group of fixtures and conducts it to the soil or waste stack or to the building drain.
References in periodicals archive ?
Even better is when bucks push on the horizontal branch and the entire tree spins away from their efforts.
Another nest matched the low cup/base of Simon and Pacheco (2005), being totally supported by a single horizontal branch 100 mm in diameter of a 17 m tall Cupania vernal& tree.
The cowbird remained stationary near the main trunk on a horizontal branch of a white pine (Pinus strobus) as the adult warbler searched for food.
Specific topics covered include the UV spectrum of the galactic bulge, helium and the hot horizontal branch, binary population synthesis and sdB stars at different metallicities, and hypervelocity stars.
Assuming a cylindrical log shape with a central pith, a log transformed linear regression model was developed to predict minimum horizontal branch angle (branch azimuth) between successive knots, with respect to log size, that would produce at least one piece of lumber at a desired grade, by product, from the center cant using either an edge or centerline knot pattern.
A large horizontal branch from a neighboring oak blocked the buck's body.
Stage one went OK: take the vertical branch between the palms of your hands, push down against the horizontal branch, and then rub them together as fast as you can.
He looked up and found a Common Nighthawk perched on a horizontal branch above the road, surrounded by a group of mobbing birds that consisted of a Downy Woodpecker (Picoides pubescens), an Eastern Phoebe (Sayornis phoebe), two Eastern Bluebirds, and a Magnolia Warbler (Dendroica magnolia).
Look for areas of stress, such as dead, dying or straggly branches, bug infestation, disease or water sprouts, the latter a fast-growing branch that grows vertically and off a horizontal branch, disrupting the natural form of the tree.
Abutilon is an excellent choice, as is a plant that develops a horizontal branch pattern naturally, such as cotoneaster.
The nest was placed flush against the trunk and was supported primarily by a cluster of Tillansia bromeliads and secondarily by a 4-cm diameter, horizontal branch crossing under the nest.
This bird methodically hopped along one horizontal branch, looking for arthropods under loose bark, then gleaned insects from several other large horizontal branches, until it flew to the canopy of another tree.