Period changes in the pulsating extreme helium stars V652 her and BX Cir
In: Monthly Notices of the Royal Astronomical Society, Jg. 361 (2005), Heft 2, S. 559-564
Online
academicJournal
- print, 28 ref
Zugriff:
Thirty-four new timings of maxima of the radially pulsating extreme helium (EHe) star V652 Her (=BD+13° 3224) obtained during 1996-2004 are reported. The quartic ephemeris (for the pulsation period decrease) is extended and the higher-order terms are defined more accurately. We also report 45 new timings of maxima for the closely similar star BX Cir (= LSS 3184) over the same baseline and present the first evidence that this star also shows a decreasing period. The data obtained thus far can be represented by a quadratic ephemeris - a linearly decreasing period in BX Cir - though the decrease rate (dP/dn ∼ 3.7 x 10-10 d) is much smaller than in V652 Her.
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Period changes in the pulsating extreme helium stars V652 her and BX Cir
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Autor/in / Beteiligte Person: | KILKENNY, D ; CRAUSE, L. A ; VAN WYK, F |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 361 (2005), Heft 2, S. 559-564 |
Veröffentlichung: | Oxford: Blackwell Science, 2005 |
Medientyp: | academicJournal |
Umfang: | print, 28 ref |
ISSN: | 0035-8711 (print) |
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