Zobrazeno 1 - 10
of 816
pro vyhledávání: '"J. R. Percy"'
Autor:
Richard McKim
Publikováno v:
Astronomy & Geophysics. 40:1.34
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::830bf86a2a72bb15e78414ed7218d93c
https://doi.org/10.1093/astrog/40.1.1.34-a
https://doi.org/10.1093/astrog/40.1.1.34-a
Autor:
Wolfgang Wenzel
Publikováno v:
Astrophysics and Space Science. 201:153-153
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c10bfb28a786822ee8034ec496d626bc
https://doi.org/10.1007/bf00626989
https://doi.org/10.1007/bf00626989
Publikováno v:
Odessa Astronomical Publications, Vol 23, Iss 0, Pp 125-128 (2010)
A collection of active photometric observations over the last half decade, archival data from the past 120 years, radial velocity observations from 1984, and recent monitoring through a pro-am collaboration reveal that the 9th magnitude F9 Ib supergi
Externí odkaz:
https://doaj.org/article/2b357249b4834a498bcb001b84b49e83
Publikováno v:
Odessa Astronomical Publications, Vol 23, Iss 0, Pp 129-132 (2010)
Random changes in pulsation period occur in cool pulsating Mira variables, Type A, B, and C semiregular variables, RV Tauri variables, and in most classical Cepheids. The physical processes responsible for such fluctuations are uncertain, but presuma
Externí odkaz:
https://doaj.org/article/e39c99bc3959487e9db676e7ee4a1d93
Autor:
Wenzel, Wolfgang
Publikováno v:
Astrophysics and Space Science; February 1993, Vol. 201 Issue: 1 p153-153, 1p
Autor:
J. R. Percy, G. Gilmour-Taylor
Our group has recently used a form of autocorrelation analysis to identify and study short-period variability in A and B type stars, using Hipparcos epoch photometry (Percy and Wilson 2000, Percy et al. 2002). Our method calculates, for all pairs of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89869c8d57ed2dd8e2fb6e350885c6e1
https://doi.org/10.1553/cia142s48
https://doi.org/10.1553/cia142s48
Publikováno v:
Astronomy and Astrophysics Supplement Series. 117:255-259
We present V light curves of P Cygni from JD 2446200-9300 (1985-1993). Inspection of the light curves, and Fourier and autocorrelation analysis, show that the star varies on time scales of about 40 to several hundred days. No one time scale stands ou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ada52862e5d89d692be417cb50fbb60
https://doi.org/10.1051/aas:1996154
https://doi.org/10.1051/aas:1996154
Autor:
J. R. Percy, L. Szabados, K. Oláh, N.N. Samus, Luis A. Balona, D.W. Kurtz, Nancy Remage Evans, T.G. Barnes, Amelia Wehlau, M. W. Feast, D.E. Winget, Siobahn M. Morgan, C.J. Butler, L. Hartmann
Publikováno v:
Transactions of the International Astronomical Union. 22:243-276
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e35983584f0cfceeb85ace14f3850f1e
https://doi.org/10.1017/s0251107x00008051
https://doi.org/10.1017/s0251107x00008051
Autor:
ERBUDAK, Kadir Can1 kadircanerbudak@windowslive.com, YEŞİLBURSA, Cemil Cahit2 yesilbursa@gazi.edu.tr
Publikováno v:
International Journal of Eurasia Social Sciences / Uluslararasi Avrasya Sosyal Bilimler Dergisi. haz2024, Vol. 15 Issue 56, p885-907. 23p.
Autor:
J. R. Percy
Publikováno v:
International Astronomical Union Colloquium. 134:123-136
Recent observations of several types of supergiant variable stars are reviewed: massive blue, yellow and red supergiants; classical and population II Cepheids; RV Tauri stars; yellow semi-regular (SRd) variables, including UU Herculis stars; and R Co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21e8080b3b0d9a68adbb464de4415651
https://doi.org/10.1017/s0252921100014019
https://doi.org/10.1017/s0252921100014019