On the K-term and dispersion ratios of semi-regular variables
| dc.contributor.author | Aslan, Zeki | |
| dc.contributor.department | Fen Fakültesi | tr_TR |
| dc.date.accessioned | 2019-06-28T09:09:01Z | |
| dc.date.available | 2019-06-28T09:09:01Z | |
| dc.date.issued | 1981 | |
| dc.description.abstract | Optical velocities of semi-regular (SR) and irregular (Lb) variables are analysed for a K-term. There is evidence for a dependence upon stellar period. Absorption lines in shorter period non-emission SR variables are blue-shifted relative to the centre-of-mass velocity by about 6±3 km s−1. Emission-line SR variables give a non-negative absorption K-term and Lb variables give no K-terms other than zero. Comparison is made with the K-terms implied by the OH velocity pattern in long-period variables. Dispersion ratios are also calculated. They are σv/σu=0.69±0.16 for non-emission, and 0.74±0.20 for emission variables (from absorption lines). Kinematics suggest that the sequence Lb–SR (non-emission)–SR (emission)–Mira is a sequence of increasing age. It is suggested that this sequence may also be the sequence indicating the direction of evolution. | tr_TR |
| dc.description.index | Wos | |
| dc.identifier.endpage | 34 | tr_TR |
| dc.identifier.issue | 1 | tr_TR |
| dc.identifier.other | 10.1093/mnras/195.1.31 | |
| dc.identifier.startpage | 31 | tr_TR |
| dc.identifier.uri | http://hdl.handle.net/20.500.12575/66904 | |
| dc.identifier.volume | 195 | tr_TR |
| dc.language.iso | en | tr_TR |
| dc.relation.index | Wos | tr_TR |
| dc.relation.journal | Monthly Notices Of The Royal Astronomical Society | tr_TR |
| dc.title | On the K-term and dispersion ratios of semi-regular variables | tr_TR |
| dc.type | Article | tr_TR |