The Rotational Velocity of Helium-rich Pre-White Dwarfs
| dc.creator | Rauch, T. | |
| dc.creator | Koeper, S. | |
| dc.creator | Dreizler, S. | |
| dc.creator | Werner, K. | |
| dc.creator | Heber, U. | |
| dc.creator | Reid, I. N. | |
| dc.date | 2002-12-06 | |
| dc.date.accessioned | 2026-07-07T02:06:45Z | |
| dc.date.available | 2026-07-07T02:06:45Z | |
| dc.description | Previous investigations on hydrogen-rich white dwarfs generally yield only very small rotational velocities (v_rot sin i). We have analyzed line profiles in high-resolution optical spectra of eight hydrogen-deficient (pre-) white dwarfs and find deviations from the dominant Stark line broadening in five cases which, interpreted as an effect of stellar rotation, indicate projected rotational velocities of 40 - 70 km/sec. For the three least luminous stars upper limits of v_rot sin i = 15 - 25 km/sec could be derived only. The resulting velocities correlate with luminosity and mass. However, since the mass-loss rate is correlated to the luminosity of a star, the observed line profiles may be affected by a stellar wind as well. In the case of RX J2117.1+3412, this would solve discrepancies to results of pulsational modeling (v_rot sin i ~ 0). | |
| dc.description | 2 pages, 1 figure, uses IAUS215.sty | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0212163 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0212163 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/5473 | |
| dc.subject | Astrophysics | |
| dc.title | The Rotational Velocity of Helium-rich Pre-White Dwarfs | |
| dc.type | text |