horizontal branch


Also found in: Wikipedia.

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 ?
Giving bucks a good-sized trunk plus a heavy horizontal branch can lead to high rubbing activity.
At clinical examination it was observed fever, decreased ruminal movements and mandibular swelling, more pronounced in the ventral-lateral face of caudal portion on the right horizontal branch of jaw (Figure 1).
Among the topics are precision observational asteroseismology using Kepler spacecraft data, updates on the pulsating sdB star Feige 48 through spectroscopy, glimpses into the secret lives of hot subdwarf stars, tidally enhanced stellar wind in binaries as a second parameter for the horizontal branch morphology of globular clusters, hot subdwarf stars as the donors of type Ia supernova progenitors, and a radial velocity survey of hot subdwarfs with main sequence companions using the Hobby-Eberly telescope.
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.
The star is on the horizontal branch of the Hertzsprung-Russell diagram, meaning that it has already gone through its first excursion to red-gianthood and has since shrunk and re-heated.
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.
It rests in trees looping its body over a horizontal branch
We measured vertical and horizontal branch growth as a function of height and of light microenvironments in saplings [less than] 8 m tall and long lateral branch growth in saplings 1632 m tall.
NGS's Horizontal Branch is performing a rigorous least squares adjustment of the High Accuracy GPS data to determine the final HARN coordinates.
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.