β Cephei type variability in the ultraviolet spectrum and radial velocity of PHL 346 |
| |
| Authors: | P L Dufton F P Keenan D Kilkenny D O'Donoghue Q A Parker F van Wyk & F van Leeuwen |
| |
| Institution: | APS Division, Department of Pure and Applied Physics Queen's University, Belfast, BT7 1NN,;South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape, South Africa,;Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ,;Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ |
| |
| Abstract: | International Ultraviolet Explorer low-resolution and optical moderate-resolution spectra are presented for the high galactic latitude β Cephei type star, PHL 346. Variability is identified in both the ultraviolet flux and the radial velocity with periods and phases consistent with those previously deduced from optical photometry. The similarity of both the flux and the radial velocity amplitude to those previously reported for the β Cephei variable, γ Pegasus, is striking and provides evidence for PHL 346 being a young core hydrogen burning star. A distance estimate for PHL 346 of approximately 7 kpc (corresponding to a z -distance of approximately 6 kpc) is obtained by scaling the distance of γ Pegasus obtained from Hipparcos observations. |
| |
| Keywords: | stars: AGB and post-AGB stars: early-type stars: individual: PHL 346 stars: variables: other ultraviolet: stars |
|
|
