An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 3 Search : birth
birth
  ۱) زایمان؛ ۲) زادمان، زاد؛ ۳) زایش   
1) zâymân; 2) zâdmân, zâd; 3) zâyeš

Fr.: 1) acouchement; 2;3 ) naissance   

1) The act or process of bearing or bringing forth offspring.
2) The act or fact of being born.
3) The coming into existence of something.

M.E. byrthe; O.E. gebyrd; cf. O.H.G. giburt, Ger. geburt; PIE *bhrto, from *bher- "to bear."

1) Zâymân, from zây present stem of zâyidan, zâdan "to give birth" (Mid.Pers. zâtan; Av. zan- "to bear, give birth to a child, be born," infinitive zazāite, zāta- "born;" cf. Skt. janati "begets, bears;" Gk. gignesthai "to become, happen;" L. gignere "to beget," gnasci "to be born;" PIE base *gen- "to give birth, beget") + -mân a suffix forming verbal nouns, → organization.
2) Zâd, past stem of zâyidan, zâdan, as above; zâdmân with prefix -mân, as above.
3) Zâyeš, from zây, present stem of zâyidan + -eš suffix of verbal nouns, → -tion.

birth binary population (BBP)
  پرینش ِ دورین‌ها هنگام ِ زادمان   
porineš-e dorinhâ hengâm-e zâdmân

Fr.: population binaire à la naissance   

In star formation models, the population of binary components formed via random pairing of stars distributed according to the → canonical IMF.

birth; → binary; → population.

birthline
  زاد-خط   
zâd-xatt

Fr.: ligne de naissance   

The path in the → H-R diagram that continuously → accreting stars follow. Stars on the birthline are difficult to observe, because they are hidden by the → accretion disk and a dense → cocoon of → interstellar matter. The star becomes visible once a sufficient amount of the surrounding matter has been dispersed. It follows that the young starsare observed generally between the birthline and the → zero-age main sequence (ZAMS). Before hydrogen ignition, gravitational contraction and deuterium burning are the main energy sources for the star. The localization of the birthline depends on the deuterium → accretion rate. First introduced by R. Behrend & A. Maeder, 2001 (A&A 373, 190).

birth; → line.