Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars

Details Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..237s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 1, 1983, p. 237-254.

Astronomy and Astrophysics

Astrophysics

28

Angular Momentum, G Stars, Main Sequence Stars, Orion Nebula, Stellar Evolution, Stellar Rotation, Absorption Spectra, Abundance, D Lines, Emission Spectra, Hertzsprung-Russell Diagram, Stellar Envelopes, Stellar Spectrophotometry, Velocity Distribution

Scientific paper

Echelle spectra of the Na D lines or weak subordinate lines have been observed and analyzed for rotational velocities for 51 G type stars in the Orion Ic cluster. The high resolution of these MMT spectra permit a detection threshold VR sin i = 7 km s-1 or better to be attained. The results indicate that the velocity distribution of these stars can be represented by two components, a quasi-Maxwellian with a low modal value, 1/2 = 12 km s-1, and a flat distribution extending out to 200 km s-1. The D line spectra of the rapid rotators exhibit narrow absorption or emission features which are attributed to circumstellar disks close to the star. These disks appear to be quasi-permanent features and almost certainly are not remnants of the protostellar accretion phase. Several of the rapid rotators exhibit X-ray emission which also appears to be correlated with rotation. The implications of these results for the angular momentum problem in star formation are discussed in detail. It is suggested that a typical star loses some of its spin angular momentum to orbital momentum in a binary. This could occur by rotational synchronism during a protostellar fragmentation process.

Affiliated with

Also associated with

No associations

Rating

Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotation among Orion IC G stars - Angular momentum loss considerations in pre-main-sequence stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-741522