POLARIS REVISITED

Citation
Kw. Kamper et Jd. Fernie, POLARIS REVISITED, The Astronomical journal (New York), 116(2), 1998, pp. 936-940
Citations number
10
Categorie Soggetti
Astronomy & Astrophysics
ISSN journal
00046256
Volume
116
Issue
2
Year of publication
1998
Pages
936 - 940
Database
ISI
SICI code
0004-6256(1998)116:2<936:>2.0.ZU;2-J
Abstract
We report 212 radial velocity measures of Polaris obtained during 1994 -1997 and use these to rediscuss Polaris's changing pulsational amplit ude and rate of period change during the 20th century. In the course o f this work we discovered a serious error in an earlier paper, which l ed to our finding too steep a decline in amplitude in recent decades. We correct this error and no longer predict a cessation of pulsation i n the 1990s. In fact, the new, more precise radial velocities suggest that the decrease in amplitude has abruptly stopped and that the peak- to-peak amplitude is holding steady at about 1.6 km s(-1), or 0.03 mag in V. The period, however, continues to change.